B'Twin Rockrider E-ST 500 Mid-Drive Motor Electric Mountain Bike
Available in S & XL in Black & Grey.
just £1600!
Here we have the mid drive version of the E-ST 500, which as the name suggests is pretty much identical to the original 500 E-MTB, but with one key difference; the Brose C alloy motor is situated by the bottom bracket and chainset. Hence the Mid(dle) Drive.
Rather than having a bulky rear hub motor, Rockrider have positioned the motor low down and with a central centre of gravity, making the E-bike feel more balanced and handle more like a traditional MTB. Mid-drive motors are usually pedal assist, and so you have to be actually pedalling (rather than freewheeling) for the motor to help you along.
The Brose motor in question provides more power than the standard E-ST 500, with 50Nm torque and a built in Torque sensor, with maximum assistance and speed set at 280% and 25km/h respectively. You can view your current status on the handlebar mounted Ergo 500 display, which shows all the main info you require including current assistance mode, speed, distance, battery level and much more.
The battery supplied will be either a Samsung SDI or LG 420Wh cell with 2 hours 45m runtime. Both are guaranteed for a minimum of 500 charges for peace of mind.
As per the rest of the similarly priced Rockrider E-Bikes (and most of their Mountain Bike range too!) the finishing kit is all own brand components - handlebars, stem, seatpost, saddle, grips etc. It's all decent stuff, but by specifying their own branded parts rather than using 3rd party means Rockrider can reduce costs and pass these savings onto the consumer.
One slight surprise is that Rockrider have only provided 160mm rotors instead of the 180mm diameter specified on many of their other E-bikes. This could be because of the inclusion of the mid-drive motor, but either way you should be able to upgrade these to 180mm for around £30 at a later date if you feel the brakes don't have enough bite. Either way, the brakes have been upgraded to hydraulic rather than the mechanical system on the E-ST 500, for more predictable and virtually maintenance free braking.
The drivetrain is a 1x8 Microshift Acolyte system, with a 12-42 cassette powered by a 34 tooth chainring.
Fancy something different? The original E-ST 500 costs around £300 less, and the budget friendly E-ST 100 is priced even closer to the £1000 mark.
Slightly further up the food chain you'll find the Rockrider E-ST 520 and finally the E-ST 900 E-MTB for just under two grand.
B'Twin Rockrider E-ST 500 Mid-Drive Motor E-MTB
A handful of E-ST 500 Mid-Drive pics
- B'TWIN Men's Alloy Hardtail E-Bike Frame with Front Suspension
- Part of the Rockrider Bikes range.
- 27.5" Disc Brake Wheels
- 8 Speed (Microshift Groupset - 1 x 8)
- Available in S & XL in Black & Grey.
- Designed for MTB riding.
- Weighs 22.8kg
Complete spec for the Rockrider E-ST 500 Mid-Drive
| Frame & Fork | |
| Frame | Rockrider Comfort Geometry hardtail frame made from 6061 aluminium with hydroformed tubes. Features 1 bottle cage mounting point and tapered head tube |
| Forks | Suntour XCM 120mm suspension fork, 30mm dampers and 9x100mm QR |
| Frame Material | Alloy |
| Frame Type | Hardtail |
| Fork Type | Suspension Fork |
| Motor | BROSE C Aluminium motor with 50 Nm torque and Torque sensor. Maximum assistance is 280%. The electric motor assistance stops at 25 km/h. Includes 3 assistance modes: Eco / Standard / Boost and Walk mode. Features the ERGO 500 display on the handlebars, which shows active assistance mode, battery level, speed (current, average, max), remaining battery, distance covered (total and trip distance) |
| Battery | Samsung SDI or LG 420Wh battery with 2 hours 45m runtime. Guaranteed for 500 charges. |
| Wheels | |
| Wheels | Rockrider Tubeless Ready 27.5" wheelset with 32 spokes and 6-bolt disc. 12x148mm Boost axle |
| Tyres | Hutchinson Gila 27.5" x 2.35" or Hutchinson Kraken 27.5" x 2.3" or Michelin Force XC 27.5" x 2.25" |
| Wheel Diameter | 27.5" |
| Controls | |
| Handlebars | Rockrider Sport oversize 720mm wide alloy handlebar. |
| Stem | Rockrider alloy stem in 70mm (size S), 80mm (size M / L), or 90mm (size XL) lengths and can be adjusted to 5 heights from 0mm to 30mm via spacers. |
| Headset | Rockrider own brand headset |
| Grips | Rockrider Sport "soft touch" grips. |
| Finishing Kit | |
| Seatpost | Alloy 31.6mm seat post |
| Saddle | Rockrider Core Comfort saddle |
| Pedals | Rockrider 520 Grip resin flat pedals |
| Braking | |
| Brakes | Tektro M276 Hydraulic disc brakes with 160mm rotors |
| Brakes Type | Disc Brakes |
| Drivetrain | |
| Groupset | Microshift |
| Chainset | 175mm crank with 34T 3D ChainFlow chainring with chain guide. |
| Front Derailleur | n/a |
| Rear Derailleur | Microshift Acolyte 8-speed medium cage rear derailleur |
| Shifters | Microshift Acolyte right shifter |
| Chain | KMC E8S special electric chain |
| Cassette | Microshift 8-sprocket 12-42 T cassette |
| Number of Gears | 8 Speed |
| Chainrings | Single Chainring |
| Cassette | 8 Speed |
| General Details | |
| Other Info | Warranty: Lifetime (frame, stem, handlebar). Availability of spare parts: 2 years. |
| Bike Type | Electric Bikes |
| Range | Rockrider Bikes |
| Weight | 22.8kg |
| Gender | Men's |
| Designed for | MTB |
| Colour | Black & Grey |
| Size | S & XL |
| Brand | B'TWIN |
| Retailer | Decathlon |
| RRP | £1599.99 |
| Lowest Price | £1599.99 |
This electric mountain bike (EAMTB) is designed for all-terrain rides with a decent amount of climbing (hilly and slightly mountainous routes).
This bike is great for improving and exploring new horizons. Attack your climbs with the motor's 50Nm of torque at 250W. Ride an average of 2 hours 45 at a sporty pace thanks to the 420Wh battery.
The built-in motor automatically assists you when needed. Perfect for MTBing.
Enjoy: raised position, 120 mm suspension, Evo Comfort saddle.
Directional control: SUNTOUR XCM 120 fork.
Motor: BROSE C Aluminium motor. Mid-drive position.
50 Nm torque. Torque sensor.
Max assistance: 280%.
The electrical assistance cuts out above 25 km / h in accordance with EU regulations.
Battery: Samsung SDI or LG.
Capacity: 420 Wh.
Our battery supplier sources its minerals responsibly and sustainably, and is part of the "Responsible Minerals Initiative".
Display: ERGO 500.
3 assistance modes: Eco / Standard / Boost.
Walk mode.
Stats displayed: Active assistance mode / Battery level / Speed (current, average, max) / Remaining battery / Distance covered (total and trip).
Weight: S: 22.8 kg.
M: 22.9 kg.
L: 23.1 kg.
XL: 23.2 kg.
Net weight without pedals.
Frame: Rockrider COMFORT GEOMETRY FRAME in 6061 aluminium with hydroformed tubes. 12x148 mm Boost.
Seat tube diameter: 31.6 mm. Tapered head tube. 1 bottle cage mounting point.
Drive train: 34T 3D ChainFlow chainring with chain guide. MICROSHIFT ACOLYTE 8-speed rear derailleur, medium cage.
Crank: 175 mm.
MICROSHIFT ACOLYTE right shifter. MICROSHIFT 8-sprocket 12-42 T cassette. KMC E8S special electric chain.
Suspension: SUNTOUR XCM fork.
Travel: 120 mm.
Dampers: 30 mm.
Axle: QR.
Format: 9 x 100 mm.
Wheels: Rockrider Tubeless Ready (needs tubeless tyres, special Presta valves and tyre sealant).
27.5", compatible with wide tyres: up to 2.5". 23 mm (width between hooks). 32 spokes.
6-bolt disc.
Freehub: HG.
Brakes: Tektro M276.
Hydraulic disc brakes. 2 piston. 160 mm front and rear.
Riding position: Rockrider SPORT "oversize" 720 mm wide alu handlebar.
The Rockrider stem is 70 mm (size S), 80 mm (size M / L), or 90 mm (size XL) and can be raised to 5 adjustment intervals: + 0mm, + 7.5mm, + 15mm, + 22.5mm, + 30mm. Rockrider SPORT "soft touch" grips.
Saddle / Seat post: Rockrider CORE COMFORT saddle. Aluminium 31.6 mm seat post.
Tyres: HUTCHINSON GILA 27.5" x 2.35" or HUTCHINSON KRAKEN 27.5" x 2.3" or MICHELIN FORCE XC 27.5" x 2.25" depending on availability.
Pedals: Rockrider 520 Grip resin flat pedals.
Warranty: Lifetime (frame, stem, handlebar).
Availability of spare parts: 2 years.
Guaranteed for 500 charges.
.. more details.
B'Twin Bikes
B'Twin are a popular choice of bike in the UK, partly due to their widespread distribution by Decathlon, and partly due to the value they offer. Their bikes are divided into several slightly overlapping ranges, with Triban best known for road and gravel bikes, and Rockrider gaining a reputation for high performing MTBs to suit every budget. Elops largely consist of a range of city bikes, whereas Riverside focus on hybrids. All in all, B'Twin bikes are well worth checking out given the size of their ranges; there's a model to suit most budgets.
Rockrider Mountain Bikes
Rockrider are Decathlon's off-road offerings, comprising of a series of kids bikes and adult hardtails, full suspension steeds and even a handful of high end E-MTBs.
This brand was launched in 2018, when Decathlon decided to split their B'Twin bikes into different genres. In terms of prices, there's something for everyone, with adult's MTBs starting at just over £200 and rising up to high end lightweight race bikes at nearly the £4000 mark.
If you want to ride off-road, and would prefer to buy from Decathlon, then the Rockrider mountain bike range is for you.
Rockrider E-ST 500 Mid-Drive Motor E-MTB Specification | |
| Bike Type | Electric Bikes |
| Range | Rockrider Bikes |
| Weight | 22.8kg |
| Frame Material | Alloy |
| Frame Type | Hardtail |
| Fork Type | Suspension Fork |
| Brakes Type | Disc Brakes |
| Number of Gears | 8 Speed |
| Chainrings | Single Chainring |
| Cassette | 8 Speed |
| Groupset | Microshift |
| Wheel Diameter | 27.5" |
| Colour | Black & Grey |
| Size | S & XL |
| Gender | Men's |
| Designed for | MTB |
| Brand | B'TWIN |
| Retailer | Decathlon |
| RRP | £1599.99 |
| Lowest Price | £1599.99 |
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Welcome to Bike Bargains - I scour the internet trying to find the best deals specifically for UK based cyclists. Over the years I've saved hundreds of pounds on cycling gear, simply by shopping around and buying cycling consumables only when they're on sale. Whether you're a road cyclist or a DH mountain biker, I handpick the best money saving cycling related bargains I can find - and will hopefully save you money too! All details are believed to be correct, but please check with the retailer prior to buying - deals and specifications change, and your contract is solely with the retailer.
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