Specifications
Frameset
| Frame | The frame of the Rockrider E-ST900 electric mountain bike has been designed using 6061 aluminium with hydroformed tubes. Why? The battery sits snugly on the frame to improve the robustness of this electric mountain bike.The forged aluminium parts make it compatible with the new 27.5"+ tyre format (wider than the 27.5") in the rear, while remaining easy to manoeuvre. We've kept a frame geometry with short bases for easier steering. |
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| Suspensions | Ride over obstacles (roots, pebbles, stones, etc.) easily thanks to the Rockshox JUDY fork with 120 mm of travel.This fork has:- a thru axle and tapered steerer tube for more durability.- pneumatic spring for optimal adjustment based on your weight- rebound adjustment and lockout for better control, depending on the terrain. |
Wheels
| Wheels | These wheels were specially designed for this mountain bike:- 36 mm rims (width between brackets) and 32 spokes at the front and rear for greater durability and a good hold on wide (2.8") tyres.- BOOST thru axles (12x148 rear, 15x110 front) for greater durability- Aluminium hubs with sealed bearings- TUBELESS READY rims: you will need tubeless tyres, Presta valves, and puncture sealant. - So you feel safe on any terrain, and to provide traction suited to your motor, the E-ST900 mountain bike is equipped with Hutchinson Taipan Koloss 27.5+ tyres with a 2.8" cross-section. Our test riders particularly liked these tyres for their good grip. Mounted on wide rims, these tyres ensure grip, traction and comfort on any terrain. |
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Brakes
| Brakes | No matter the conditions you ride in (dry, muddy, wet), the Tektro TKD32 hydraulic disc brakes on the front and rear provide powerful, progressive braking. Oversized 180mm diameter discs provide even more power. |
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Components
| Handlebar | The adjustable stem brings the E-ST 900 controls to your hands. The all-aluminium 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.In detail:- 720mm oversize ROCKRIDER SPORT aluminium handlebar- ROCKRIDER SPORT "soft touch" ergonomic grips for good grip and a comfortable feel |
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| Saddle | Since your mountain bike rides will get longer and longer, it is important to sit comfortably. So our teams designed the exclusive ROCKRIDER Ergofit Pro saddle. It fits all hip sizes and has a curved shape that is particularly good for sport trail rides.The 31.6 mm aluminium seat tube ensures compatibility with most dropper and suspension seat posts on the market. |
| Pedals | The E-ST900 electric bike comes with ROCKRIDER Flat MTB platform pedals. The pedal surface is wider and the dots more pronounced to better keep the foot on the pedal. |
E-System
| Battery | Our battery is equipped with SAMSUNG SDI cells, renowned for their high level of reliability and safety.Our battery supplier sources its minerals responsibly and sustainably, and is part of the "Responsible Minerals Initiative". - Our Rockrider mountain bike team has designed a battery that locks in place with a simple lever. Child's play!This locking system stops the battery getting shaken when you go adventuring on rough terrain.A key lock is also installed if you want to protect your battery from theft. For example, if you park your bike in the street. |
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| Motor | The BROSE T Aluminium central motor is specially designed for high altitude mountain biking:- 70 Nm torque to handle large obstacles and steep gradients- metal housing for maximum durability- belt for an ultra-quiet motor- sealed bearings to hold up to tough environments while mountain biking |