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BULLS TWENTY9 E FS 3 RSI Review

Bulls Twenty9 Fs 3 Rsi Electric Bike Review

Bulls Twenty9 Fs 3 Rsi Chain Guide Sprocket Oversized Metal Cover

Bulls Twenty9 Fs 3 Rsi Bosch Powerpack 400 Removable Battery

Bulls Twenty9 Fs 3 Rsi Locking Grips Bosch Intuvia Display Panel

Bulls Twenty9 Fs 3 Rsi Control Pad Easy Reach

Bulls Twenty9 Fs 3 Rsi 11 Speed Shimano Deore Xt Drivetrain

Bulls Twenty9 Fs 3 Rsi Rock Shox Reba Rl Solo Air Fork

Bulls Twenty9 Fs 3 Rsi Bottom Bracket Shield Chainring Guard

Bulls Twenty9 Fs 3 Rsi Schwalbe Rocket Ron Tires

Bulls Twenty9 Fs 3 Rsi Tapered Head Tube Shimano Xt Brakes

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 the sturdy thru-axles which improve strength and make alignment easier, oversized tapered head tube also adds strength
RockShox air suspension is light and highly adjustable with rebound and lockout (remote lockout up front), the Shimano hydraulic disc brakes offer low-effort braking and the XT drivetrain is high quality and versatile but not overly complicated with 1x11 setup
Unique chain tensioner elevates the chain to reduce slap and clears mud, the narrow-wide tooth configuration reduces slip and an oversized chainring guard protects it, in thick mud the smaller sprocket may allow for chain suck, the geared motor is more audible at high power and RPM, newer brand that may not be available to test in as many locations

Make:

BULLS

Model:

TWENTY9 E FS 3 RSI

Price:

$4,599

Body Position:

Forward

Suggested Use:

Trail, Mountain

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:

2016

Total Weight:

49.3 lbs (22.36 kg)

Battery Weight:

5.2 lbs (2.35 kg)

Motor Weight:

8.8 lbs (3.99 kg)

Frame Material:

7005 Aluminium

Frame Sizes:

16.14 in (40.99 cm)18.11 in (45.99 cm)20.07 in (50.97 cm)

Frame Types:

High-Step

Frame Colors:

Matte Black with Gloss White and Blue Accents

Frame Fork Details:

Rock Shox Reba RL 29 Solo Air, 120 mm OneLoc Remote Lockout, 15 mm Thru Axle

Frame Rear Details:

RockShox Monarch RT Suspension, 120 mm Travel with Lockout and Rebound Adjust

Gearing Details:

11 Speed 1x11 Shimano Deore XT, 11-40

Cranks:

FSA Cranks, 15T Chainring with Narrow Wide Teeth

Pedals:

Wellgo Alloy Platform, Cage STyle

Headset:

Tapered

Stem:

6061 STEM 3.OS

Handlebar:

Low Rise

Brake Details:

Shimano M615 Deore Hydraulic Disc with 180 mm Ice-Tech Rotors

Grips:

Ergon Locking, Flat

Saddle:

STYX

Seat Post:

Ergon Locking

Seat Post Length:

350 mm

Seat Post Diameter:

30.9 mm

Rims:

Ryde 6229

Spokes:

Stainless Steel, 14 Gauge, Black

Tire Brand:

Schwalbe Rocket Ron, 29" x 2.25"

Wheel Sizes:

29 in (73.66cm)

Tire Details:

Evolution Liteskin, Tubeless Ready

Tube Details:

Presta Valve

Other:

Aluminum Skid Plate

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)

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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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UPDATE: The TWENTY9 E FS 3 RSI is still being sold by BULLS, even though this particular review was conducted several years ago. They have since updated the Bosch motor to Gen 3 and the battery to PowerPack 500! This means improved performance, power, and range. I’m leaving the review unchanged since the videos, photos, and writeup all represent the older product that I covered :)

BULLS jumped into the US market for 2016 introducing an impressive range of electric bikes including the TWENTY9 FS 3 RSI shown here (it’s a full suspension cross country ebike with 29″ tires). This model comes in three sizes and could be especially comfortable and fun for taller riders or those with longer legs. The larger wheels elevate the bike but also smooth out terrain, improve traction and carry momentum once they’re up to speed. They aren’t as nimble to steer as a 26″ or the newly popular 27.5″ but for cross country, they work very well. I was impressed with the 120 mm air suspension by Fox, love the rebound adjust and lockout features (remote lockout for the front) and am a fan of the sturdy thru-axles and quick release systems (for easy trail maintenance or transport). The display panel and battery are also removable which makes transporting or charging the bike easier and as with other Bosch powered electric bikes, they are both easy to use and very high quality. You get a two year warranty on the electronic systems and in my experience they age very well but might put a bit of extra strain on the drivetrain (being a mid-drive). Thankfully, Bosch has a software-driven shift sensing system that helps to ease power off, I tend to slow my cadence and ease off when shifting gears to minimize mashing and slipping. This bike is very similar to one that my Uncle has been riding for over two years now which also uses the Bosch system and it’s holding up very well for him.

Some features and design choices that set the Bulls Twenty9 FS apart from the competition in my mind include an aluminum cover for the base of the motor, a chain tensioner that might clear mud and reduce chain slap, narrow wide teeth on the tensioner that reduce slip, an oversized bash guard on the chainring and extra small 15 tooth chainring and 40 tooth large rear sprocket (which combine for efficient starts and climbing power for you and the motor). It’s a beautiful bike, one that’s fun to ride and easy to use. As with other Intuvia operated Bosch ebikes, turning the bike on and choosing from four levels of assist is quick and easy, you can keep your left hand on the grip and operate the display by using your thumb and the display itself is large enough to read in an upright position (and backlit for night use). You can see this e-bike in action on a trail as I rode with my friend Rick the other day in a vlog video here. He has loved the bike so far but only had it for a month and not been able to comment on some sensitive areas I’ve heard about from other riders (for all similar ebikes) about how the remote lockout works and whether the lever is in the way or too sensitive and the possibility of chain suck (where mud gets clogged in the front sprocket area and causes the chain to wrap around and seize the drivetrain). For most riding, the bike should perform very well and I noticed and appreciated the latest of Bosch’s motors called the CX which offers higher torque.

Pros:

I love the extra tiny sprocket guide / chain tensioner (similar to Haibike’s Sprocket Equalizing System) because it probably helps to clear debris from the chain and lift it above the rear swing arm, it should reduce chain slap on the right chain stay and possibly chain slip as well given the narrow wide tooth pattern
Despite being relatively new in the US (at the time of this review in 2016 Bulls had only been here for one season) the company has been selling bikes internationally since 1994 with ebikes in 2007 and seems to have a good reputation
The Bosch CX motor is a higher torque design offering 75 Nm vs. 60 Nm with the older 2015 models, it’s perfectly suited to an off-road model like the Bulls Twentynine
Extra large 40 tooth climbing sprocket in the rear (11 gears total!) and a smaller 15 tooth chainring for efficient climbing and easier pedaling since the bikes are heavier ~50 lbs with the battery and reinforced frame
Available in three frame sizes so you can dial in fit, as a 29er you get more traction, rolling momentum and a higher frame position so this could be an excellent choice for taller riders
The motor seems well protected by an Aluminum skid plate (that is color matched and appears to be replaceable), I also like that there’s a cuff built around the base of the battery so it melds with the frame visually and possibly adds strength or protection, the extra long and thick rubber slap guard also helps with chain slap
Comes stock with Ergon locking grips! Name brand, very comfortable and solid to ride with… given the cross-country orientation of this bike with 120 mm travel I like that the grips aren’t too thick or wavy like the GP-1 models, I think the grips were a good choice, the end pieces extend forward a bit and might keep your hands from sliding off
The shocks are both nice, high quality air suspension from RockShox with rebound adjust and lockout… the front suspension fork has remote lockout so you can adjust on the fly (again, good for cross country where the trail might smooth out)
Quick release on both wheels, this is one of the advantages of a mid-drive system, the axles are both overbuilt with 15 mm thru-axle up front and 12 mm in the rear, improves strength and makes aligning the disc brakes easier
Solid 180 mm Hydraulic disc brakes from Shimano offer excellent stopping power and the tiny levers are easy to reach and use with just one or two fingers… what you’d expect for off-road use
The top tube is designed with a steep angle and is able to drop pretty low on the seat tube (where it is reinforced) and this lowers stand over height making it easier to mount and handle, the suspension design itself uses the 4 bar link that is pretty efficient (formerly patented by Specialized, now open in the US)
I love that the battery pack is removable but can be charged on or off the frame, it secures with a sturdy locking core and just looks great, if you took it off it seems like there would be enough room to hang the bike on some hitch style racks like this
The Bosch Intuvia display is awesome, large enough to read but easy to remove if you’re bombing a downhill section or parking the bike outside, I love the remote button pad that lets you select between assist levels and explore menus like range, odometer, max speed etc.
Awesome two year warranty on the electronics (battery and motor from Bosch) with a total of five years on the frame from Bulls, nice since they’re newer in the United States
I love how responsive the Bosch centerdrive motor is, it kicks in and cuts out extremely fast because it’s measuring pedal speed, rear wheel speed and your pedaling torque over 100 times per second and it even has shift sensing software to ease off and protect your chain and gears

Cons:

I can’t say for sure but the extra large chainring bash guard could cause mud and debris to build up and cause chain suck (a common issue for Bosch powered ebikes that have super small ~15T chainrings), this probably won’t be an issue unless you ride off-road in thick mud
Not quite as light weight as some of the other full suspension Bosch powered ebikes I’ve tested like the XDURO Fullseven but that might be due in part to the larger tires and 29er wheel size and extra skid plate and moulding around the battery
I’ve been told by some riders that the remote lockout mechanism with a lever as used here can be annoying because it gets bumped and switches too easily to locked, I haven’t had that experience but my ride time has been limited
Being geared, the centerdrive motor does produce some electronic whirring noises which become more pronounced in the high levels of assist and especially when pedaling cadence speeds up
Even though I trust BULLS and they have been doing well internationally, being new to the USA this and other models may be difficult to see in person and test ride before purchase

Resources:

Official Site: http://www.bullsebikes.com/product/twenty9-e-fs-3-rsi/
More Pictures: https://goo.gl/photos/4aSStnabdeukCMAM6

January 29, 2024 (10 months ago)

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MODEL YEAR: 2018, 2019

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MODEL YEAR: 2018, 2019

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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

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

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…...

2017 BULLS MONSTER E S Review

MSRP: $4,299
MODEL YEAR: 2016, 2017

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…...

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 CROSS LITE E Review

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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