Since your mountain bike rides will get longer and longer, it is important to have a suitable seat. So our teams designed the exclusive ROCKRIDER Ergofit Evo 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.

The E-ST500 electric bike is equipped with a single chainring and SRAM X-SYNC anti-drop technology to prevent chain drops. A single shifter on the right handlebar makes it easy to shift between the 9 speeds. In detail:, - SRAM X-Sync 32-tooth chainring, - Shimano Altus M2000 9-speed rear derailleur, - Shimano Altus M2000 shifter with gear indicator, - Shimano Altus 9-cog 11-36 cassette, - KMC X9 chain

To prevent the chain coming off, the E-ST500 electric bike has a single SRAM NX chainguard with X-Sync technology. Made from steel for greater durability. An end to confusion: simply change between the 9 speeds using the single shifter on the right handlebar. In detail:, - SRAM X-Sync 32-tooth BCD 94 steel chainring, - Shimano Altus M2000 9-speed rear derailleur, - Shimano Altus M2000 shifter, - KMC x9 chain, - 9-speed 11-36 tooth cassette

To prevent the chain slipping, the E-ST500 electric bike is equipped with a single SRAM NX chainring with X-Sync technology. Made from steel for greater durability. An end to confusion: simply change between the 9 speeds using the single shifter on the right handlebar. In detail:, - SRAM X-Sync 32-tooth BCD 94 steel chainring, - Shimano Altus M2000 9-speed rear derailleur, - Shimano Altus M2000 shifter, - KMC x9 chain, - 9-speed 11-36 tooth cassette

To prevent the chain coming off, the E-ST500 electric bike has a single SRAM NX chainguard with X-Sync technology. Made from steel for greater durability. An end to confusion: simply change between the 9 speeds using the single shifter on the right handlebar. In detail:, - SRAM X-Sync 32-tooth BCD 94 steel chainring, - Shimano Altus M2000 9-speed rear derailleur, - Shimano Altus M2000 shifter, - KMC x9 chain, - 9-speed 11-36 tooth cassette

These wheels were specially designed for this mountain bike:, - 19 mm rim with 28 spokes at the front, - 23 mm rim (distance between flanges) with 36 oversize spokes at the back for more sturdiness and a good hold on wide tyres up to 2.5". - Cone hub with bearings (easy to maintain) at the front, - Sealed motor bearings at the rear, - TUBELESS compatible at the rear: you'll need rim tape, a TUBELESS tyre, a PRESTA valve and tyre sealant

These AERO TRAIL wheels have been specially designed for mountain biking:, - 23 mm rims for improved durability and good grip on wide tyres. - a rear wheel with 36 oversized spokes to resist the torque of the motor.

So you feel safe on any terrain and for traction adapted to your motor, the E-ST500 mountain bike is equipped with Hutchinson Cougar 27.5" x 2.4" tyres. 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.

So you feel safe on any terrain and for traction adapted to your motor, the E-ST500 mountain bike is equipped with Hutchinson 27.5" x 2.4 tyres (TAIPAN). Our test riders particularly liked these tyres for their grip on the ground. Mounted on wide rims, these tyres ensure grip, traction, and comfort on all terrain and in any weather conditions.

So you feel safe on any terrain and for traction adapted to your motor, the E-ST500 mountain bike is equipped with Hutchinson 27.5" x 2.4 tyres (TAIPAN). Our test riders particularly liked these tyres for their grip on the ground. Mounted on wide rims, these tyres ensure grip, traction, and comfort on all terrain and in any weather conditions.

So you feel safe on any terrain and for traction adapted to your motor, the E-ST500 mountain bike is equipped with Hutchinson Cougar 27.5" tyres 2.4" across. Our test riders particularly liked these tyres for their grip on the ground. Mounted on wide rims, these tyres ensure grip, traction, and comfort. On any terrain.

The motor on the rear wheel was co-developed with VISION for mountain biking:, - a torque of 42Nm to overcome any slope, - a 150x12mm hub to stand up to rough terrain, - and sealed bearings to withstand the weather, which can often be tough when mountain biking. What if you get a puncture? 8 Mm Allen key a needed to unscrew the wheel nuts. This tool is available in our 900 multi-purpose tool/bike multi-tool.

The rear wheel motor is specially designed for mountain biking:, - a torque of 42Nm to overcome any slope, - a wheel axle of 150x12mm to resist the strains of rough terrain. - and watertight bearings to resist weather conditions that can sometimes be tough. What if you get a puncture? An 8mm Allen key is all you need to unscrew the wheel nuts. This tool is available in our 900 multi-purpose tool/bike multi-tool.

The rear wheel motor is specially designed for mountain biking:, - a torque of 42Nm to overcome any slope, - a wheel axle of 150x12mm to resist the strains of rough terrain. - and watertight bearings to resist weather conditions that can sometimes be tough. What if you get a puncture? An 8mm Allen key is all you need to unscrew the wheel nuts. This tool is available in our 900 multi-purpose tool/bike multi-tool.

The motor on the rear wheel was co-developed with VISION for mountain biking:, - a torque of 42Nm to overcome any slope, - a 150x12mm hub to stand up to rough terrain, - and sealed bearings to withstand the weather, which can often be tough when mountain biking. What if you get a puncture? 8 Mm Allen key a needed to unscrew the wheel nuts. This tool is available in our 900 multi-purpose tool/bike multi-tool.

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. There is also a lock in case you want to stop your battery getting stolen. For example, if you park your bike in the street.