2017 BULLS MONSTER E S Review

Bulls Monster E S Electric Bike Review
Bulls Monster E S
Bulls Monster E S Alloy Skid Plate Motor Protector
Bulls Monster E S Bosch Powerpack 400 Removable Battery
Bulls Monster E S Bosch Intuvia Display Panel
Bulls Monster E S Schwalbe Jumbo Jim 4 Inch Tires
Bulls Monster E S Rock Shox Bluto Rl Solo Fat Tire Suspension Fork
Bulls Monster E S 11 Speed Shimano Deore Xt
Bulls Monster E S Shimano Ice Technologies Disc Brake Rotors
Bulls Monster E S Bosch Performance Cx Motor
Bulls Monster E S Electric Bike Review
Bulls Monster E S
Bulls Monster E S Alloy Skid Plate Motor Protector
Bulls Monster E S Bosch Powerpack 400 Removable Battery
Bulls Monster E S Bosch Intuvia Display Panel
Bulls Monster E S Schwalbe Jumbo Jim 4 Inch Tires
Bulls Monster E S Rock Shox Bluto Rl Solo Fat Tire Suspension Fork
Bulls Monster E S 11 Speed Shimano Deore Xt
Bulls Monster E S Shimano Ice Technologies Disc Brake Rotors
Bulls Monster E S Bosch Performance Cx Motor

Summary

  • Premium hardtail electric fat bike with all the fixins, highlights include rear rack bosses, tubeless-ready tires and punched out rims, RockShox air fork with remote lockout and high torque Bosch CX motor
  • Quality 180 mm hydraulic disc brakes from Shimano for excellent stopping power and modulation, impressive light weight for such a large electric bike at ~52.5 lbs, quick release rear wheel and removable battery to reduce further
  • Available in two frame sizes for improved rider fit, angled top tube lowers stand over height but classic diamond frame is still stiff, strong and compatible with many hang-style racks (especially with the battery off)
  • Would be nice if the front wheel was also quick release but the 15 mm thru axle is nice for improved handling and strength, no throttle mode for help managing those precarious moments in deep sand or snow but that keeps it Class 1

Video Review

Introduction

Make:

BULLS

Model:

MONSTER E S

Price:

$4,299

Body Position:

Forward

Suggested Use:

Trail, Sand and Snow

Electric Bike Class:

Pedal Assist (Class 1)
Learn more about Ebike classes

Warranty:

2 Years Motor and Battery, 5 Years Frame

Availability:

Europe, Canada, United States, Australia, New Zealand

Model Year:

20162017

Bicycle Details

Total Weight:

52.5 lbs (23.81 kg)

Battery Weight:

5.2 lbs (2.35 kg)

Motor Weight:

8.8 lbs (3.99 kg)

Frame Material:

7005 Aluminium

Frame Sizes:

18.11 in (45.99 cm)20.07 in (50.97 cm)

Frame Types:

High-Step

Frame Colors:

Matte Black with Matte Grey and Neon Green Accents

Frame Fork Details:

Rock Shox Bluto RL Solo Air, 100 mm Remote Lockout, 15 mm Thru Axle

Frame Rear Details:

11 mm Quick Release Skewer

Attachment Points:

Rear Rack Bosses

Gearing Details:

11 Speed 1x11 Shimano Deore XT, 11-40

Shifter Details:

Shimano XT Triggers on Right

Cranks:

FSA CK-760/IS Cranks, 15T Chainring

Pedals:

Wellgo Alloy Platform, Cage Style

Headset:

Tapered 1 1/8"

Stem:

7° Rise (80 mm, 90 mm)

Handlebar:

Low Rise, 720 mm, 25 mm Rise, 9° Bend

Brake Details:

Shimano M615 Hydraulic Disc with 180 mm Shimano XT Rotors

Grips:

Flat Rubber

Saddle:

Selle Royale M1

Seat Post:

Alloy

Seat Post Length:

300 mm

Seat Post Diameter:

30.9 mm

Rims:

Alloy, Punched Out Square Holes, 32 Hole

Spokes:

Stainless Steel, 13 Gauge, Black

Tire Brand:

Schwalbe Jumbo Jim, 26" x 4"

Wheel Sizes:

26 in (66.04cm)

Tire Details:

Snakeskin, Tubeless Easy

Tube Details:

Presta Valve

Accessories:

Large Slap Guard

Other:

Aluminum Skid Plate, Locking Removable Battery Pack

Electronic Details

Motor Brand:

Bosch Performance Line CX, Gen 2

Motor Type:

Mid-Mounted Geared Motor
Learn more about Ebike motors

Motor Nominal Output:

350 watts

Motor Torque:

75 Newton meters

Battery Brand:

Samsung

Battery Voltage:

36 volts

Battery Amp Hours:

11 ah

Battery Watt Hours:

396 wh

Battery Chemistry:

Lithium-ion

Charge Time:

3.6 hours

Estimated Min Range:

35 miles (56 km)

Estimated Max Range:

85 miles (137 km)

Display Type:

Intuvia, Removable, Adjustable Angle, Grayscale, Backlit LCD

Readouts:

Speed, Assist Level (Eco, Tour, Sport, Turbo), Battery Level (1-5), Odometer, Trip Distance, Estimated Range, Clock, Max Speed, Average Speed, Trip Time, Shift Assist Recommendation

Display Accessories:

Independent Button Pad with Tactile Feedback on Left, 6 Volt Micro USB Port on Display

Drive Mode:

Advanced Pedal Assist (Measures Wheel Speed, Pedal Cadence and Pedal Torque, Power Output Relative to Pedal Input: Eco 50%, Tour 120%, Sport 190%, Turbo 275%)

Top Speed:

20 mph (32 kph)


Written Review

Fat tire electric bikes have grown in popularity over the past few years and mainstream brands have taken note. At least one major company introduced a mid-drive powered fat bike with front suspension during the 2015 / 2016 season but the Bulls Monster E S is the only model I’m aware of that’s powered by Bosch and available in the US. This ebike uses the CX variant of the second generation Bosch Centerdrive which offers more torque, a faster response time and a nicer interface than the other system I’ve tested… some of this is my opinion of course but features like display removability, integrated Micro USB charging and forward compatibility with larger batteries (namely the new Bosch Powerpack 500) make it a standout against Yamaha, Brose and Impulse. This performance however, is reflected in the price.

The Monster ES costs ~$4,300 which stings for many mainstream consumers but to be honest, I think it’s priced well. You get a near complete upgrade on all of the components, two frame size options, a two year comprehensive warranty and a fat bike that’s relatively light weight made from high grade Aluminum alloy. My favorite part is the rack interface at the rear, there are four threaded eyelets for adding a cargo rack which transforms this beast into a “go anywhere” commuter. Sand, snow, rain or shine won’t stop this bike and weather / terrain aside… larger riders might feel that the aesthetic suits their presence and build more than smaller bikes. I love that the bright accents aren’t overdone but that the bike offers some color and fun. It’s a cool looking bike with a battery and motor that match the color scheme and are mounted in a way that sort of blends with the frame and tires. There’s also a tough aluminum skid plat bolted to the bottom of the motor, protecting it from rocks and other obstacles you might encounter on adventurous rides.

Perhaps my only gripes with this electric fat bike, aside from the price tag, are the lack of quick release on the front wheel, basic rubber grips that don’t lock and the limited availability at dealers right now. Bulls is relatively new to the US market and while they’ve expanded into roughly 20 dealers at the time of this review, it’s not a bike that everyone is going to be able to find locally and take out for a test ride. Take note however, brands like Bosch only partner with companies they trust and Bulls has been accepted in Europe and parts of Asia, selling ebikes for several years now. Some of the premium parts used on this model include Shimano hydraulic disc brakes (both large 180 mm) with ICE Technology rotors meant to dissipate heat, an 11 speed Shimano Deore XT drivetrain and RockShox Bluto air suspension fork with remote lockout. A couple of areas I think could be improved by Bosch include adding a battery percentage readout on their display and perhaps higher power output on the USB port built into the display so that phones and some other portable electronic devices could be charged and not just maintained when plugged in.

Overall, it’s a bike that gets the job done with instantaneous feedback from pedal assist that measures wheel speed, pedal cadence and pedal torque 100 times per second. The chainring is extra small with just 15 teeth for improved torque and climbing power. The motor spins that chainring roughly twice as fast as the cranks rotate and this produces a natural feel while pedaling while empowering to motor to operate efficiently. It starts and stops super fast but there is a bit of an electronic whine or whir produced when pedaling at higher RPM. It’s something you see (or hear) with all of the current Bosch e-bikes. In optimal conditions (flat pavement with a ~160 lb rider using Eco mode) you should be able to reach up to 60 miles per charge with the standard 400 watt hour pack or you can pay more for the newer 500 watt hour and go ~25% further. Both batteries look the same and are removable to reduce frame weight if you’re transporting the bike. I do appreciate the traditional, stiff triangular frame (which hangs on many car racks easily) but it presents a higher stand-over height so it’s cool that the top tube is angled down to take that into account and shave off an inch or two for people with shorter legs. Cables and electrical wires are all internally routed for protection and a nicer look as you see with more expensive models.

I took the bike into sand (both soft and firm) and it performed well when I let some air out of the tires. Again, these are higher-end Schwalbe tires with a layer of puncture protection and the ability to be run tubeless to reduce weight. So the bike stood up to the challenges of riding in sand but it did kick some up onto my legs a bit (no fenders), the 100 mm air fork suspension took the edge off of the bumpy parts and I was able to steer alright. It’s amazing how much help you’re getting from an electric assist bike… having ridden bikes like this without power on sand, it’s nearly impossible. The only question mark in truly rigorous terrain like this is the lack of throttle because there are times when it’s nice to just get help starting from rest or power through a difficult section without worrying about shifting gears. Most mid-drive electric bicycles just don’t offer throttle mode. This is a Class 1 electric bike that will be legal in more locations (like mountain bike trails) but without the throttle there’s a bit more balancing and work to be done. Rest assured however, it’s very possible and quite enjoyable. Another consideration with fat bikes is that if you’re spending this kind of money for a bike and then actually ride it near the ocean with salt water there may be corrosion and rust happening, especially if you don’t rinse it immediately after each ride. I wrote a guide about this here and included some pictures and feedback from a hardcore rider in Europe who uses a Bosch powered bike. So the way I’d approach this thing is as a weekend warrior where there’s a rack for hauling, a good drive system delivering excellent climbing and range, a nice suspension setup and fun off-road capable tires that could be enjoyed on the weekends and taken care of on those special beach or salty snow days. It’s just something I’d baby a little because it’s so capable and can really last if you do. Big thanks to Bulls for partnering with me for this review.

Pros:

  • Robust drive system with additional protective metal paneling below the motor, offers 75 Newton meters of peak torque output for excellent climbing or slogging (the Bosch CX offers 15 more Nm than the standard Bosch Performance line)
  • In addition to the metal push guard, there’s an oversized alloy chain guard protecting the chainring and keeping your chain from bouncing off on bumpy terrain, an extra-large rubber slap guard protecting the chainstay and I like that you get metal pedals but would probably upgrade from the cages to a Wellgo platform like this for increased surface area and traction
  • Name brand tires from Schwalbe, the Jumbo Jim model offers “Snakeskin” puncture protection and can be run tubeless for decreased weight and improved low-pressure performance, the punched out rims reduce weight and look cool
  • Awesome suspension setup… you get a RockShox Bluto air fork with remote lockout, 100 millimeters of travel performance and a 15 mm thru-axle for strength
  • Great utility potential with this bike given the seat stay bosses so you could add a rack and fit a trunk bag or panniers, make sure to get a fat bike rack that is disc brake ready like this
  • The bike is available in two frame sizes for improved fit whether you’re tall or short, the top tube is angled down for lowered standover height, reinforced seat tube bumps up for strength and would work well with a 30.9 mm thudbuster to improve comfort (long or short travel would work), nice name brand Selle Royal saddle that’s color matched to the bike
  • Motor and battery weight are kept low and center for improved handling and I love that the controller provides shift sensing feedback to spare the chain and sprockets if you’re shifting under load (extra important off-road or in soft environments with hard pedaling, especially given that this bike has 11 speeds)
  • The battery can be charged on or off the frame and I like how it blends in with the black frame and is designed into the downtube with a little cup at the bottom, the Bosch system is forward compatible with the new 500 watt hour pack but comes with the 400 watt pack standard here
  • I was really impressed by the weight of this bike at ~52.5 lbs, yes I was on the smaller frame size but that’s still good for a fat-ebike and I attribute it to the nicer components, premium frame and air fork
  • The price point also wowed me considering the nicer components and solid two year warranty (with five on the frame) at ~$4,300 it’s a very complete package including 180 mm hydraulic disc brakes with XT rotors from Shimano
  • The Bosch Intuvia display panel is intuitive to use, large and easy to read, backlit for use at night, it includes a Micro USB charging port on the right side for maintaining a phone or charging a headlight (or other portable electronic device) and it’s completely removable! I love that there’s also a button pad break out box positioned near the left grip for adjusting power and readouts on the fly without taking your hand off

Cons:

    x

  • The Bosch Centerdrive is one of my favorite ebike motor systems because it’s efficient and durable but it does not offer a throttle mode (that keeps the bike a Class 1 here), the downside is that sometimes on snow and sand it’s nice to have extra help when you can’t pedal easily (something a Class 2 would offer)
  • No bottle cage bosses on the seat tube… it looks like there might be room but given the up-release battery design that Bosch offers maybe it would be a tight fit, at least you have the option for adding a rack
  • No quick release on the front wheel… just the back, that makes transporting and flat fixes a bit more time consuming
  • Given the larger, heavier wheels and tires used on this and most fat bikes, I was surprised that the rear wheel wasn’t using a 12 mm thru-axle… just a standard 11 mm skewer
  • The grips work alright but aren’t locking so they can spin easier if you really bear down or get them wet or hot riding, cheap to upgrade but given the price of this bike kind of a low point
  • One area I really feel like the Bosch system could be improved is with the display panel because it only shows five battery bars vs. an actual percentage estimate (or more bars), there’s a big difference between 20% remaining and empty when you’ve got a bike this big to haul back home
  • The second generation Bosch mid-drive (that the CX is built on) produces a distinct whine because the sprocket spins at about 2x pedal rotation… this makes it super responsive but that noise is more noticeable than the Brose and some Impulse 2 motors (or even Yamaha)

Resources:

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  • MSRP: $4,399
  • MODEL YEAR: 2018, 2019

One of the stealthiest 28 mph urban electric bikes I have seen, the Bosch Powertube battery pack is completely hidden inside the downtube and the compact black motor casing blends perfectly with the matte black paint job. The mid-motor is angled up to blend into downtube visually, increase ground clearance, and shorten…...

BULLS SIX50 EVO AM 4 Review

  • MSRP: $7,399
  • MODEL YEAR: 2018, 2019

A top-end all mountain electric bike with 150 mm suspension from Fox, Shimano Deore XTR 11-speed drivetrain, Bosch CX high-torque motor, and Magura MT Trail hydraulic disc brakes. Wider Boost hub spacing offers a strong bracing angle for the spokes and room for…...

BULLS LACUBA EVO E45S Review

  • MSRP: $3,899
  • MODEL YEAR: 2018, 2019

A high-speed 28 mph commuter style electric bike that comes in four frame sizes and three styles (high-step, mid-step, and step-thru), it offers excellent weight distribution (motor and battery are positioned low and center). Beautiful aesthetic with hidden wires, an internally mounted battery, and a smaller motor casing, the…...

BULLS E-CORE Di2 FS 27.5+ Review

  • MSRP: $5,999
  • MODEL YEAR: 2018, 2019

A full suspension electric trail or enduro mountain bike with 150 mm travel, large 2.8" plus sized tires, and Boost hub spacing for strength, made in three frame sizes. All-black frame, fork, and anodized RockShox stanchions makes for a mean look, Shimano STePs E8000…...

BULLS LACUBA EVO E8 Review

  • MSRP: $3,799
  • MODEL YEAR: 2018

One of the most popular models in the Bulls ebike lineup, it comes in four frame sizes and three styles (high-step diamond, mid-step, and step-thru wave), motor and battery weight are low and center. Extremely stealthy, the drive system and battery are almost completely hidden on this frame and…...

BULLS MONSTER E FS Review

  • MSRP: $5,499
  • MODEL YEAR: 2018, 2019

Top of the line, full suspension, fat tire electric trail bike with RockShock Bluto and Monarch air, remote lockout for the fork, 11-speed Shimano Deore XT drivetrain with Shadow Plus clutch, robust skid plate and alloy drivetrain guides. High-torque Bosch Performance Line CX motor with eMTB drive mode, sand and snow capable if…...

BULLS SIX50 EVO AM 3 Review

  • MSRP: $5,499
  • MODEL YEAR: 2018, 2019

An all-mountain style electric bike with longer travel 150 mm air suspension from RockShox, an internalized downtube battery from Bosch, and three frame size options. Fatter 2.8" plus sized tires provide increased traction, reduced deflection, and improved comfort while remaining…...

BULLS CRUISER E Review

  • MSRP: $3,299
  • MODEL YEAR: 2018, 2019

A feature-complete cruiser style electric bicycle with paint-matched fork, fenders, rear rack, chain cover, and motor casing, available in three frame sizes with adjustable stem for good fit. Large sprung saddle, puffy stitched grips, swept back handlebars, and the deep step-thru frame make…...

BULLS AMINGA TR 1 Review

  • MSRP: $4,299
  • MODEL YEAR: 2018, 2019

A full suspension, cross country style, electric mountain bike made just for the ladies with shorter reach, available in two smaller size options, features a turquoise fuchsia colorway. Sturdy Suntour XCR 34 air suspension fork with remote lockout for easy transitions from rough…...

BULLS TWENTY4 E Review

  • MSRP: $2,899
  • MODEL YEAR: 2018, 2019

A tough, sporty looking, high-quality, kids electric bike that can reach ~15.5 mph with four levels of pedal assist, smaller wheels keep the frame low and approachable. Premium accessories including tires from Schwalbe, a Shimano Altus 8-speed drivetrain, and Tektro hydraulic disc…...

BULLS CROSS E Review

  • MSRP: $2,799
  • MODEL YEAR: 2017, 2018, 2019

Well priced considering the quality Bosch-made electric drive system, four frame size choices, and three frame styles (high, mid, and low-step). Integrated LED lights and premium Continental tires with reflective sidewall stripes help to keep you…...

BULLS E-STREAM EVO FS 2 27.5 Plus Review

  • MSRP: $4,099
  • MODEL YEAR: 2017, 2018

One of the cleanest looking full suspension cross country electric bikes I've reviewed, the battery and motor are built into the frame and match the matte black paint perfectly. Extra large battery capacity for longer rides, EnergyBus magnetic charging standard works on or off…...

BULLS SIX50 E 1.5 Review

  • MSRP: $3,099
  • MODEL YEAR: 2017, 2018, 2019

A hardtail trail ready e-bike with comfortable plus sized tires and a spring suspension fork (with lockout), sturdy tapered head tube, rigid thru-axles, and Boost up front. Capable as a commuting platform if you prefer a mountain bike vs. hybrid or city…...

BULLS CROSS LITE E Step-Thru Review

  • MSRP: $4,099
  • MODEL YEAR: 2017, 2018

An active, sporty looking, commuter style electric bike with low standover height, available in three frame sizes to improve fit and comfort. High-end drivetrain and motor systems, you get eleven gears with a tough mountain bike level…...

BULLS SIX50+ E FS 3 Review

  • MSRP: $4,699
  • MODEL YEAR: 2017, 2018

An all-mountain electric bike with plus sized tires for improved stability, traction and comfort, 150 mm air suspension with compression and rebound adjust. Battery and motor mount design are tighter than older Bosch systems, weight is kept low…...

BULLS E-STREAM EVO 45 FS Review

  • MSRP: $5,199
  • MODEL YEAR: 2017, 2018

A high quality full suspension e-mountain bike that's also a speed pedelec (capable of 28 mph top speeds), solid hydraulic disc brakes, wide thru-axles with Boost Technology. Adjustable 150 mm RockShox suspension front and rear, four-bar rear swing arm to reduce brake…...

BULLS E-STREAM EVO 3 Carbon 27.5 Plus Review

  • MSRP: $4,599
  • MODEL YEAR: 2017

A Carbon fiber electric cross country mountain bike with premium components and ultra-integrated motor and battery system, excellent weight distribution. The Brose motor is quiet and responsive offering up to 90 Nm of torque output,…...

BULLS DAIL-E GRINDER Review

  • MSRP: $5,799
  • MODEL YEAR: 2017, 2018

One of the first Gravel Grinder style electric bikes to make it to America! Made with premium components, high performance lights and a purpose built frame in three sizes. Capable of high speed 28 mph performance, the Bosch centerdrive motor measures bike speed, pedal…...

BULLS SIX50 E 2 STREET Review

  • MSRP: $3,899
  • MODEL YEAR: 2017, 2018, 2019

A fully equipped speed commuter capable of 28 mph operation, running on the proven Bosch Performance mid-drive motor and updated 500 watt hour Samsung battery. Extra large 203 mm hydraulic disc brakes offer smooth solid stops without requiring exorbitant hand…...

2017 BULLS LACUBA EVO E8 Review

  • MSRP: $3,999
  • MODEL YEAR: 2017

A versatile urban electric bike well suited to commuting, touring and trekking because of its efficient mid-drive motor and larger than average battery capacity, durable internal gearing and belt drive. Available in five frame sizes and three frame styles including wave, mid-step and high-step diamond…...

BULLS E-STREAM EVO FS 3 27.5 Plus Review

  • MSRP: $4,699
  • MODEL YEAR: 2017, 2018

A stealthy full suspension all-mountain electric bike with longer travel 150 mm suspension, fully adjustable air fork by RockShox, color matched to frame. Larger 37 volt 17.5 amp hour battery pack to assist with steeper climbs and longer…...

2017 BULLS MONSTER E FS Review

  • MSRP: $5,299
  • MODEL YEAR: 2017

Full suspension fat bike with a high quality mid-drive motor from Bosch and their updated 500 watt hour battery pack for extended range. Cool fluorescent paint job that extends all the way through the fork, rear shock housing,…...

BULLS LACUBA EVO E45 Review

  • MSRP: $4,399
  • MODEL YEAR: 2017, 2018, 2019

Available in four frame sizes, two styles (high-step and mid-step) with an adjustable stem, active-comfort saddle and ergonomic grips, this bike can fit well and feel good at speed and over long distances. Capable of 28 mph top speeds, this is a Class 3 electric bike with an…...

BULLS E-STREAM EVO FS 3 27.5 Review

  • MSRP: $4,699
  • MODEL YEAR: 2016

An all-mountain electric bike with beautifully integrated battery, motor and display... it blends in more than most other e-mountain bikes I've tested and runs quiet. Sturdy 15 mm thru axle in the front and 12 mm axle in the rear…...

BULLS SIX50 E FS 3 RSI Review

  • MSRP: $4,599
  • MODEL YEAR: 2016

A loaded full suspension mountain bike with premium electric drivetrain from Bosch offering 75 Nm of climbing torque with the CX motor and a 400 watt hour Samsung battery. RockShox air suspension with 120 mm travel front and rear for solid trail or all…...

BULLS OUTLAW E45 Review

  • MSRP: $3,999
  • MODEL YEAR: 2016

A sporty looking, fairly comfortable speed pedelec capable of ~28 mph top speeds, it's running on an optimized geared hub motor design with heat pipe technology for maximum performance. Unique mid-mount battery box fills the main frame triangle keeping weight low and centered while…...

BULLS STURMVOGEL E EVO Review

  • MSRP: $3,699
  • MODEL YEAR: 2016

A beautifully designed urban electric bike painted white for visibility and modern appeal, white walled tires, reflective sidewall stripes, LED lights. Extra sturdy and durable thanks to a 15 mm thru-axle on the front wheel (with…...

BULLS TWENTY9 E FS 3 RSI Review

  • MSRP: $4,599
  • MODEL YEAR: 2016

A full suspension, Bosch powered, cross country style electric bike with efficient 29" wheels, it's available in three sizes for good fit and would feel taller and larger for riders with long legs but still fits some shorter riders given the angled top tube. Quick release for both wheels ads convenience for fixes and transporting the bike, I love…...

BULLS CROSS LITE E Review

  • MSRP: $3,699
  • MODEL YEAR: 2016

Fully loaded urban electric bicycle with great accessories for commuting including an aluminum rear rack, full length fenders with mud flaps and integrated LED lights. Relatively light weight at under 50 lbs, this is due in part to the nicer…...

BULLS E-STREAM EVO FS Enduro 27.5 Review

  • MSRP: $5,399
  • MODEL YEAR: 2016

An enduro style full suspension electric mountain bike with longer 160 mm suspension travel, seat post dropper, 27.5" wheelset and premium hydraulic brakes. Downtube-integrated battery pack is out of sight and keeps weight low and centered across the…...


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