Name: Stromer ST2 S Review
Item: Stromer ST2 S
Author: Court Rye

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Stromer ST2 S Review

Stromer St2 S Ultra Motor Syno Drive 500w Motor

Stromer St2 S Downtube Integrated Removable Battery 983 Wh

Stromer St2 S Integrated Touch Screen Display Custom Stem

Stromer St2 S Ergon Locking Ergonomic Grips Gs1 Backlit Buttons Di2 Shifter

Stromer St2 S Backlit Touch Screen Display Panel

Stromer St2 S Spring Back Hebie Kickstand Alloy Platform Pedals

Stromer St2 S Handle Bar Custom Stem Grips

Stromer St2 S Magura Mt Next E Brake Levers

Stromer St2 S 52 Tooth Single Ring Chainring

Stromer St2 S 11 40 Tooth Cassette Tmm4 Torque Sensor

Stromer St2 S 12 Mm Thru Axle 180 Carbon Steel Disc Brake Rotors

Stromer St2 S Continental Top Contact Ii Tires 26x2

Stromer St2 S Fsa Bottom Bracket Hebie Kickstand

Stromer St2 S Main Omni Display Readouts

Stromer St2 S Shimano Xtr Derailleur 11 Speed Cassette Di2 Electronic Shifting

Stromer St2 S Wireless Omni Display Panel

Stromer St2 Vs St2s Tail Lights Rack Fenders

Stromer St2 Vs St2s Supernova Headlights

An urban racer with smooth electronic shifting, app-driven performance tuning, ultra-bright dynamic lighting that responds to braking, five levels of power regen and regenerative braking
Available in three high-step frame sizes for improved fit, impressive weight distribution for a hub-powered ebike, removable downtube-integrated battery pack offers nearly 1 kWh capacity for 100+ mile range
Premium components and accessories including Shimano XTR drivetrain, Magura MT Next e brakes, DT Swiss wheelset, Continental tires, Supernova lights and Ergon grips and saddle
Heavier than most speed pedelecs but lighter than the standard ST2 and solidly built, comfortable to ride thanks to enlarged tires and carbon fork, extremely expensive electric bike priced at $9,490 USD

Make:

Stromer

Model:

ST2 S

Price:

$9,999

Body Position:

Forward Aggressive

Suggested Use:

Commuting, Urban

Electric Bike Class:

Speed Pedelec (Class 3)

Learn more about Ebike classes

Warranty:

2 Year Battery (Or 1,000 Full Charge Cycles), 2 Year Motor, 3 Year Frame

Availability:

United States

Model Year:

20162017

Total Weight:

57.5 lbs (26.08 kg)

Battery Weight:

11 lbs (4.98 kg)

Motor Weight:

10.6 lbs (4.8 kg)

Frame Material:

6061 Aluminum Alloy

Frame Sizes:

17 in (43.18 cm)20 in (50.8 cm)22 in (55.88 cm)

Geometry Measurements:

Medium 20" Frame: 20" Seat Tube Length, 21.75" Reach, 31.5" Stand Over Height, 70" Length

Frame Types:

High-Step

Frame Colors:

Matte Grey with Red Accents

Frame Fork Details:

Rigid Carbon Fiber, 15 mm Proprietary Axle

Frame Rear Details:

12 mm Proprietary Axle

Attachment Points:

Rear Rack Bosses, Front Rack Bosses, Fender Bosses, Bottle Cage Bosses

Gearing Details:

11 Speed 1x11 Shimano XTR Di2 with Electronic Shifting, 11-40T

Shifter Details:

Shimano Di2 Triggers on Right Bar

Cranks:

FSA Crank Arms, Hollow Spindle, 52 Tooth Chainring

Pedals:

Aluminum Alloy Platform

Headset:

Threadless 1-1/8" x 1-1/2"

Stem:

Custom Alloy, Internal Cable Routing

Handlebar:

Flat Tapered, 25.5"

Brake Details:

Magura MT Next e Quad-Cylinder Hydraulic Disc with 180 mm Carbon Steel Rotors, Magura Levers with Motor Inhibitors and Regen Activation

Grips:

Ergon GS1 with Lockers

Saddle:

Fizik Special Edition

Seat Post:

Aluminum Alloy, Black

Seat Post Length:

355 mm

Seat Post Diameter:

31.6 mm

Rims:

DT Swiss, 559" x 25"

Spokes:

Stainless Steel, Black, 14G Front 13G Back

Tire Brand:

Continental Top Contact II, 26" x 2.0"

Wheel Sizes:

26 in (66.04cm)

Tire Details:

Reflective Sidewall Stripe

Tube Details:

Presta Valve

Accessories:

Aluminum Alloy Fenders with License Plate Mount at Rear, Supernova M99 Pro Headlight 1250 Lumens, Supernova LED Tail Light (5 Red Back Facing LED's, 3 Down Facing LED's), Daytime Running LED Headlight in Head Tube, USB Charging Port Built Into the Head Tube Light, Hebie Sprung Kickstand

Other:

Locking Removable Battery Pack, Enhanced Security Features (Electronic Motor Lock, GPS Location Tracking Within GSM Network), Rosenberger Standard Energy Bus Charging Port with Magnetic Cover, 2 Amp 1.4 lb Battery Charger

Motor Brand:

SYNO Drive (Ultra Motor)

Motor Type:

Rear-Mounted Gearless Direct Drive Hub

Learn more about Ebike motors

Motor Nominal Output:

500 watts

Motor Peak Output:

750 watts SYNO drive gearless direct drive rear hub motor weighs 11 pounds (5kg) offers 42 Newton meters of torque

Motor Torque:

40 Newton meters

Battery Brand:

Samsung

Battery Voltage:

48 volts

Battery Amp Hours:

20.5 ah

Battery Watt Hours:

983 wh

Battery Chemistry:

Lithium-ion

Charge Time:

5 hours hours for a full charge from empty

Estimated Min Range:

60 miles (97 km)

Estimated Max Range:

120 miles (193 km)

Display Type:

Integrated, Backlit, Touch Screen LCD on Top Tube

Readouts:

Touch Screen on Bike: Speed, Battery Voltage, Assist Level (1-3), Odometer, Trip Time, Mobile App for iOS and Android: Battery Percentage, Trip Distance, Average Trip Speed, GPS Map, Motor Tuning (Speed, Torque, Agility)

Display Accessories:

Independent Backlit Button Pad on Right, Rubberized Power Button Below Top Tube, Omni Cloud Mobile App (View and Enter Service Records, Update Firmware, System Status, Location Tracking, Motor Block, Lock and Unlock, Performance Tuning)

Drive Mode:

Advanced Pedal Assist (TMM4 Torque Sensor with Accelerometer and Gyroscopic Incline Sensor)

Top Speed:

28 mph (45 kph)Speed Pedelec

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Make or Model

Model Year

Body Position

Suggested Use

Frame Type

Drive Mode

Availability

Price Range

$0 (0 €)$18,000 (16,920 €)

Total Weight

0 lbs (0 kg)227 lbs (103 kg)

Top Speed

0 mph (0.0 km/hr)50 mph (80.5 km/hr)

Battery Watt Hrs

0 watt3,456 watt

Frame Size

0 in (0.00 cm)432 in (1,097.28 cm)

Motor Power

0 Newton meters250 Nm

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With the ST2 S (which stands for Sport) Stromer took an already amazing looking, technologically advanced, super-fast electric bike that felt cost prohibitive at $7k and said… let’s take it further guys!!! And so, priced at nearly $10k the S model is an ebike I probably wouldn’t be allowed to test ride were it not for my journalistic credentials ;) but oh what fun, it was to ride. This is a Class 3 speed pedelec that can reach 28 mph (easily) and travel over 100 miles in the lower assist levels. The high range is calculated using a 170 lb rider on flat paved surfaces pedaling in the lowest assist level (of which there are three) so keep that in mind. Still, in the highest level they estimate 40+ and that’s still amazing range in my opinion. Part of what makes this possible is the 1 Kilowatt hour battery pack (most ebikes have 350 to 500 kWh), the rigid frame with slick oversized road tires and built in regeneration modes including regenerative braking. I’m convinced the ST2S is what you’d get if Elon Musk was tasked with building an electric bicycle because it looks amazing, performs well and some of the kit borders on ridiculous. Consider the 1250 Lumen Supernova M99 Pro headlight… the standard ST2 offers a 165 Lumen Supernova E3 that impressed a lot of people when it launched, it’s the same headlight that Specialized uses on their Turbo models and it’s a huge step up from 99.9% of the other ebikes out there, but hey, why not offer 700% more brightness? Add to that, a U shaped running light integrated into the head tube and a five LED tail light that’s wired into both brake levers for increased brightness during stops.

Integrated, unobtrusive, streamlined… these words must have been scrawled across a whiteboard somewhere in Switzerland when they were designing the ST2 and underlined for the ST2 S. The display panel is built into the top tube and uses a semi-pressure sensitive touch screen (for easier use with gloves), the custom battery pack fits inside the downtube and a sleek Aluminum door with rubberize water-resistant lining seals it in, a rubberized backlit button pad is clamped near the right grip to change assist levels, activate bright mode on the headlight or engage regen mode and electronic shifting delivers precision gear changing. I compared the ST2 mechanical derailleur to the ST2S electronic in the video review and found that it performed faster, operated more quietly and seemed to be better tuned. Wait, you may think… perhaps the ST2 just needed a tuneup? Maybe, but think about the wire going from those shifters all the way to the derailleur and how that might stretch or burn through the plastic tubing over time. Electronic shifting doesn’t have that issue! I like that they went the extra mile and added a chain tensioner or “clutch” as the Stromer rep called it during the demo. Apparently these are used on enduro mountain bikes to avoid chain slip and slap. The brake levers used on the bike are also a carry over from the mountain biking world designed to be light weight but sturdy.

The specs are all listed here and it could take forever to walk through every function on the bike but I want to call out how simple the main touch-screen display is to understand and use. Considering all of the potential features and settings on the bike, you really don’t need the app or any experience to get riding straight away. A rubberized button below the display (on the underside of the top tube) activates the bike and from there you simply arrow up or down with the pad near the grip and start pedaling. Holding up on the button pad goes into a boost mode, acting like a throttle from 0 to 12 mph. If you need to change the display units from Metric to Imperial just navigate to the settings area of the touch screen and from there you can connect with a smart phone to use the mobile app and begin performance tuning. I love that the app lets you disable the lights and do the whole bike-lock thing. It’s pretty intuitive and apparently very effective. If a thief grabs the bike the motor locks, lights begin flashing… they can’t get the battery out because it’s locked int the frame with a metal core and you’re instantly notified via text (along with Stromer HQ) so you can zero in on the GPS coordinates and go kick some ass (or get assistance from local authority) who can kick some ass with you!

Let’s be honest, the bike looks amazing… During the ride test in Venice Beach California (an expensive artsy community near Los Angeles) a bunch of well dressed wealthy looking guys kept noticing the bike and saying “cool bike” which is not something I hear a lot on other ebikes. They usually didn’t know it was electric and I think the integrated battery, black hub motor (that blends with the disc brake, 11 speed cassette and black spokes) and cool two-toned color scheme has a lot to do with that. I’d usually shout out “it’s electric!” with dorky enthusiasm and the excitement persisted. The ST2 and ST2 Sport models are available in many parts of Europe and North America (specifically the USA) but the rules for use vary. So in Europe most of the time riders need a special license and a cute little plate to go with it (cough… nanny state… cough). All models have a spring loaded kickstand, ball-end brake levers and an optional side mirror as well as a mount on the rear fender with three white LED’s to illuminate said license plate… all carry-overs from EU requirements.

In closing, there’s a lot to appreciate with this bike… and with the cheaper ST2 and even the ST1 models. They all look awesome and feel robust. The larger tires absorb bumps and cracks at high speed along with the Carbon fiber fork (which can be swapped out for a suspension fork). I often complain about increased weight on electric bikes but the ST2 models feel fluid and the weight almost carries the bike through bumps vs. transferring them directly into your hands and hind quarters. Consider a Body Float suspension post or Thudbuster to improve ride quality. I love the magnetic battery charging interface and the ability to charge the pack on or off the frame. You could easily and enjoyably ride this thing around unpowered but the motor would decrease efficiency through weight and some cogging action (magnets inside repelling when the motor is unpowered). They chose to go with a 1×11 drivetrain here and I think that was a good choice because the 11-40T range is enough to start and keep up at higher speed. You’ll notice in the video I was switching gears a lot and that’s a testament to the acceleration of the bike. The custom TMM4 torque sensor senses how hard you’re pushing and combines accelerometer and gyroscope feedback about terrain to offer smooth, fast power. There is a bit of delay in when you stop pedaling and when the motor actually cuts out and I believe that was done intentionally to reduce any feelings of surge while pedaling. Basically, this blends power output so acceleration doesn’t match pedal strokes exactly, potentially creating a wavy power feel vs. smooth consistent.

If I could afford an ST2 I’d feel great about buying one because the technology is efficient, it’s capable of replacing a car for longer trips to work and safer because of the speed and power it offers (commanding more respect from cars). Every Stromer battery pack is pre-charged with wind-power generated electricity and the company has a fun supportive culture. Clearly, it’s not for everyone and Stromer does offer bikes starting in the $2k range but you just get a lot more with the ST2 Sport. Whether it’s love of design and technology that fascinates you here, a utilitarian need and desire to replace your car in the most awesome way possible or an eye for beauty and exotics… the ST2 S is a unique and rare electric bike that I enjoyed testing out.

Pros:

Every battery that is shipped with a Stromer electric bike, including the ST2, is charged with solar power (which also powers the myStromer AG headquarters in Oberwangen, near Bern / Switzerland)
Three frame sizes to choose from (17″, 20″ and 22″) to fit a wide range of riders, long sturdy seat post is wider at 31.6 mm and has a nicer collar than many ebikes I test, consider swapping it with a Body Float for added comfort
Extremely high end components including Shimano XTR derailleur with Di2 electronic shifting and chain tensioner (like you’d find on enduro mountain bikes), front and rear thru-axels and Continental tires with reflective sidewalls… I like that they also squeezed in a bottle cage mounting point on the downtube
Speed pedalec capable of reaching 28 miles per hour, very responsive (uses TMM4 torque sensor in combination with a gyroscopic accelerometer)
The display interface uses touch-screen technology, features a day-night sensor for back lighting and is integrated directly into the top tube which reduces clutter on the handle bars
The full-length Aluminum fenders provide excellent coverage and look beautiful in black, they feel sturdy and don’t rattle when riding at high speed, the rear Supernova 5-LED light is integrated into the fender and features downward facing white LED’s to illuminate a license plate (required in parts of Europe), the stem allows wires to be internally routed keeping the cockpit clean
Color matched special edition Fizik saddle looks great, the stiff alloy platform pedals were responsive and satisfying at higher speeds and grippy when my shoes were damp, the Ergon GS1 grips were comfortable and sturdy with lockers
Backlit button pad on right handle bar is easy to understand and operate with while riding, you don’t have to take your hand off the grip, it felt less fragile than some of the other button pads I’ve tested and stays out of the way
The custom 15 LED running light (at the head tube) looks cool but the Supernova M99 Pro is the true tool for visibility with two modes (LED vertical lights along the sides or a super-bright main light offering 1250 Lumens), the 5 LED tail light (also by Supernova) works as a running-light in low and when you pull either brake lever it goes high, lights can be shut off using the mobile app
Custom designed battery pack slides into the downtube much easier than on the ST1 models, the shell is made with colored Aluminum which looks cool and you can charge it on or off the bike using the same EnergyBus magnetic plug… the ST1 models used two different ports and required a dong’e for the charger which was easier to lose
The bike is backwards compatible with the normal ST2 pack but comes standard with a higher capacity 983 watt hour battery that is capable of 100+ mile rides depending on your chosen level of assist
Any time you brake with either lever (not just the right one like with ST1 models) power regeneration kicks in and the bike “recoups” some energy, you can also hold the minus button and select from five recoup levels for longer hills to get more energy
Premium hydraulic brakes with Carbon Steel rotors to dissipate heat and provide ample stopping power, the Magura levers are enduro style with composite housings and Aluminum levers for reduced weight
Stromer is an established brand dating back to 2009 with global distribution, the ST2 received a Eurobike Gold award, Red Dot Quality Seal award, two Testsieger awards, an Outside magazine award, a Taipei Cycle show award and an iF design award
The smart phone app interfaces with a cloud platform called Omni that lets you interact with the bike remotely including an anti-theft measure that will lock the motor, flash the lights and notify you via text, the system will also help you track the bike down using built-in GPS
The bike itself has built in wireless technology allowing it receive software updates on the fly… this means you don’t have to go into a bike shop and wait or pay extra to get the latest and greatest

Cons:

This is one of the heavier city style electric bikes I’ve tested in the high-end category at nearly 60 pounds depending on the frame size
Dealerships that offer Stromer electric bikes are growing but the service network is smaller than a brand like Specialized, Haibike or IZIP
Cogging slows down the rear wheel when motor is not in use vs. a freewheel (metal staters repel the strong rare earth magnets located around the circumference of the hub casing – this is a con for all direct drive gearless motors but more noticeable on high power motors such as the one used for the ST2), a benefit that negates this con somewhat is the active regeneration and regenerative braking
The Di2 electronic shifting unit and derailleur run on independent batteries, there’s a charging port on the right side of the mini-display near the stem but it would be nice if they were just wired into the bike’s main battery
I love how streamlined the touch screen interface is but due to its location (the top tube vs. handle bars on most ebikes) you have to look down further to see your speed and other details which could be distracting… thankfully the button pad to control assist and lights is mounted near the right grip and you can download their mobile app and mount your phone on your bars for easier viewing if you’d like
This is an extremely expensive electric bike, probably one of the most expensive I’ve seen that’s a not a limited run or passed off as art, consider getting bicycle insurance
While the bike is available in three sizes, you only get one color scheme (gray with red accents) and a traditional high-step frame style vs. the standard ST2 which comes in a step-thru frame that some may find easier to mount

Resources:

Official Site: https://www.stromerbike.com/en/us
More Pictures: https://goo.gl/photos/r6oRGwAAhZvofMpA7

January 29, 2024 (10 months ago)

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James Ledesma

9 years ago

Everything about this bike says you want to ride it until you said $10,000 are you out of your mind for Hilo ELO three-wheel car compared to this you’re throwing your money away

Court Rye

So many factors… if you use this ebike instead of a car you’ll be healthier for sure, possibly safer if you avoid streets and might save money in the long run on gas, licensing and insurance. If you appreciate the artistry and technology and feel inspired by it then it’s like art, some art can be priceless. The bike could reflect what kind of person you are and for some people $10k or even $100k is more readily available… I know women who have spent thousands on purses, it still carries their stuff but maybe it speaks to their soul in a way that’s worth paying extra for. I think there are lot worse things to spend money on… for example, lots of people smoke and spend upwards of $5k per year on cigarettes and those have zero health benefits, adversely impact your community and create ugly trash. I’d much rather have an ST2 S than smoking and I’d feel awesome about it :D

Marcel

Recent story about a ST2s demobike that has being stolen and found last week in Germany here. The story in in a German language.

Thanks Marcel! Neat to see and hear how the GPS recovery feature works and that it performs so well :D

Chris @ Propel Electric Bikes

8 years ago

That’s really awesome! We have heard of several cases where bikes were recovered with the OMNI. It’s a really nice function to have, especially in places where security is a big concern. In NYC it’s certainly a factor.

Tyler Penney

Those welds…

Do you like them? I’d love to hear your specific input as I don’t know much about welding, are they super smooth or do you not like them :P

kim treadaway

Yes ,,way to expensive ,especially for a hub assist . Mid drives are the way to go and many companies are switching over to them . Also the distance you say is very limited for the price . Your bikes need to be more streamline looking ..to boxie …sorry

No need to apologize Kim, the bike is indeed expensive and mid-drive is trendy right now but the regen, silent operation and smooth acceleratio of this gearless hub is still enjoyable. This isn’t the ideal utility ebike and value doesn’t come into the equation as much as beauty and speed. There are bikes that go further, weigh less, offer more comfort but that could also be said for Ferrari, Lamborghini and Porche :)

Dave

7 years ago

…you need to learn the difference between “to” and “too.”

Thanks for the feedback, I realize there are some grammatical errors throughout the site and from users in the comments here. My understanding is that too means “also” and I try to use it as such, hope this distinction helps Kim and others ;)

David

So F*ing awesome! Do you think this will be the best road bike of 2016. Do you think Specialized will be able to keep up? I spoke with a guy from Specialized and he said the new e-bike would be released this summer.

Nice! I’ve seen the older Turbo models and like how they’ve expanded the line to offer more price points (like Stromer). The competition is great, both ebikes are beautiful but the ST2 S really impresses me, it steps up the game from “hey, the ST1 is like the Turbo” to more of a leadership position, cutting edge tech done really well. I’m a fan but I’ll also be following Specialized closely ;)

Jack Tyler

Back in the day my 2nd car was a Honda 350 motorcycle, chosen to lower commuting costs and for fun. With a Huge Splurge, I swapped it for the big BMW with front fairing, side panniers and the rest. We did some l-o-n-g touring trips on it, but without a doubt the most joy of ownership was its extraordinary performance just doing the ordinary. That’s what this bike reminds me of…and it even looks like it came out of a BMW factory. My Stromer riding experience (on a recent ST2) was unlike any other bike I’ve ridden so far…but I’m glad you reviewed this for us, Court, as it’s as close as most of us are likely to get. ;)

Thanks for the support Jack, I appreciate the beauty and excitement these electric bikes bring and it’s nice to hear your story about the BMW. Much of my life is routine, discipline and utility but there’s room for passion in there as well ;)

Nelson Blake

Thanks for your St2s review Court, as all your reviews it is totally informative. I currently own an St2. I had it for a year and my mouth still drops open with total amazement every time I ride it. I test rode quite a few electric bikes and also own a Dahon formula s18 with the Bionx kit which I also enjoy. But the St2 still remains my ultimate in riding experience. Sometimes I sit in New York’s Times Square with it and it becomes a conversation piece. Locals and tourists always notice it and stop and ask questions and give compliments. I also let people test ride it and they all come back with the same comments that it is like nothing they have ever ridden in their lives. The electronic switching on the St2s sounds nice but my St2 mechanical switching is smooth enough for me. I have also accessorized with a brighter light in addition to the original 165 lumen that it came with so I think I’ll stick with my St2. I’m still totally in love with the way it rides and looks.

Hi Nelson! I got to visit New York City for the first time a year or so ago and Times Square was very cool. I’ve heard the laws there are a bit sensitive towards ebikes so owning one that’s near silent and more “normal” looking makes a lot of sense. I’m glad you’re enjoying it out there and it’s cool of you to share it with people like that :D

Bruce Granofsky

WOW! Well, I tried out the Specialized Turbos and they were certainly wonderful, but just ordered the Stromer ST2S and will pick it up in a couple of weeks. You only live once, and the Stromer has put a wide smile on my face. Can’t wait to do some touring with it! Thanks for the great reviews Court. (it’s all your fault! :) ) Bruce

Ha! Well I bet you’re going to have a BLAST, all of these bikes in this higher quality range are just fantastic. Super quiet, fast and with neat features. The ST2 is AMAZING both in terms of performance and aesthetics, truly a sports car of the ebike world ;)

YOung

July 2016 – with current model; if you had to pick between Turbo S and ST2; which one would you go with? (if money was not an issue)

Ohhh… that’s a tough call, they are very similar in terms of performance (high speed, regeneration, silent motor). I love the aesthetic on both as well but appreciate the local dealers that Specialized has vs. Stromer, if you live near one of their shops it could make buying, getting fit and getting service easier.

Steven Brady

6 years ago

Just bought the 2018 iteration of this bike at a good discount. I love it! Thanks for your review and what you do! I greatly appreciate it. And yes, I am going to try to completely replace my car.

Court

That’s awesome, Steven! Hope it works great for you. Stromer produces some of the most beautiful, fastest, quietest speed pedelecs I’ve seen and the ST2 S is an incredible top-end ebike. Perhaps you could report back how it works after you’ve ridden for a while! Ride safe :)