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ROCK MACHINE eRokk B70 City
The ideal e-bike for a relaxed ride in the city, thanks to the agile 27.5" wheels. It offers a powerful Bosch Performance Line CX 5th generation motor, 625 Wh battery, a range of up to 150 km and practical features such as a rack, mudguards and lights.
BOSCH Performance Line CX Smart System
85 Nm
625 Wh
8 speeds
27,5"
100 mm (front)
RST Blaze suspension fork
Suspension fork with 100 mm of travel and hydraulic damping for a smooth ride on bumps, suitable for recreational riding on e-bikes. With locking option.
AXA Block XXL
Robust frame bike lock that offers a high level of security thanks to hardened steel and anti-drill protection. It is also ideal for bicycles with wider tyres (e.g. e-bikes and city bikes). With the option to attach an additional chain or cable, you can easily increase security by attaching the bike to a fixed object. The lock has a practical ergonomic design and allows easy operation.
The ROCK MACHINE eRokk B70 City is a reliable e-bike for everyday commuting in the city or even shorter trips on cycle paths. The lowered frame allows for comfortable entry and exit, and the upright seating position not only contributes to better visibility in traffic, but also to greater comfort and less strain on the back.
The proven Bosch Performance Line CX Smart System mid-motor with up to 600W of power and 85Nm of torque ensures a smooth and agile ride, making it easy to tackle even the toughest climbs or a brisk start from an intersection. Power is supplied by an integrated 625 Wh battery that can be used for up to 150 km on a single charge, with the option of connecting an additional battery for even longer range. Keep track of your activities with the Bosch Purion 200's clear display.
The bike is equipped with a rack with a load capacity of up to 27 kg, making it easy to carry your belongings on your daily street ride. The low rolling resistance tyres ensure an efficient ride and grip on the road, and the 27.5" wheels make the bike agile and nimble. Shimano ESSA gears in a 1×8 configuration with a cassette range of 11-45 teeth provide ample range for a comfortable ride over a variety of terrain. For maximum safety, the e-bike is equipped with Shimano hydraulic brakes and wide pedals with a large contact patch.
There is also a powerful AXA front light with an intensity of 30 lux, which you will appreciate especially when riding in twilight or darkness.
Need help choosing the right e-bike? Take advantage of our guide to choosing an e-bike or contact us directly.
E-bike range calculator
The e-bike range is approximately
*Factors affecting total range include assist mode settings, technical condition of the e-bike, battery age, ambient temperature, headwind, and riding technique
Bosch Performance Line CX 5th generation engine
The 5th generation motor offers 85 Nm and a peak power of 600 W. Thanks to the magnesium housing, it is lighter (2.8 kg) and quieter. The new mounting system makes installation easier. Improved sensors measure rider inputs more accurately, ensuring a more natural power transfer. The motor has hill-start and walk assist for added comfort. Lower weight improves maneuverability and component durability. Auto mode automatically adjusts terrain assistance. Compatibility with Bosch smart systems allows tracking of ride details, making planning and the ride itself easier.
BOSCH POWER TUBE 625
The new PowerTube 625 battery allows trekking and mountain e-bikes to take them long distances. Thanks to its compact size and minimalist design, the battery can be integrated into the e-bike to achieve the optimal effect.
Bosch Purion Display
Purion is a minimalist on-board computer for anyone who demands sleek look of handlebar whether it is for City or off-road use . You can conveniently get all the important information at the touch of a button while riding with both hands remaining on handlebar. Five different riding modes give you the right support in every situation. The display is supplied with cabling, handlebar holder and is available in two colors.
The same great passion that led the early enthusiasts to build the first e-bike always leads them forward - to enjoy the joy of creating the best e-bikes and bring them to others. Rock Machine is a lifelong passion and mission of the designers of this company and the same great feelings you'll get from riding their e-bikes. Everyone loves an active lifestyle, so it's no wonder that e-bikes have been involved since 1994.
Parameters
General
| Model year | 2025 |
| Brand | Rock Machine |
| Frame size | Frame L, Frame M |
| Load capacity | 120 kg |
| Colour | Grey |
Motor
| Engine manufacturer | Bosch |
| Engine type | Bosch Performance Line CX Gen. 5 - Smart System |
| Torque | 85 Nm |
| Centre engine | Yes |
Battery
| Charger | Bosch 2A |
| Battery capacity | 600 - 699 Wh |
| Precise capacity | 625 Wh |
Suspension
| Front fork | RST Blaze, 100 mm |
Components
| Saddlebag | Suspended, One1 Alloy, ø 30,9 mm |
| Saddle | SELLE ROYAL Essenza Moderate |
| Front hub | SHIMANO HB-QC300, 36H, CL, M9X100mm, QR Type |
| Rear hub | SHIMANO FH-QC300-HM, 36H, CL, M10X135mm, QR Type |
| Grips | Herrmans Grips |
| Extender | ONE1 TDS-C342 Alloy, 31.8xE45mm, +3° |
| Handlebars | ONE1 Alloy, width 760 mm |
| Racks | STARS J30D, Disc, 32H |
Transmission
| Number of gears | 1x8 |
| Sorting | Shimano Altus |
Brakes
| Front brakes | Shimano MT200, hydraulic, 180 mm |
| Rear brakes | Shimano MT200, hydraulic, 180 mm |
Questions
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