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 4th generation motor, 625 Wh battery, a range of up to 150 km and practical features such as a rack, mudguards and lights.
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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 Smart system
BOSCH Performance Line CX Smart System. A powerful and dynamic motor for intuitive handling and a unique driving experience. Thanks to its multi-sensor concept and innovative Bosch motor management, the Performance Line CX Smart System sets new technical standards - responding flexibly and responsively to develop its full potential on technically demanding tracks.
One powerful feature is the eMTB mode, which uses exactly as much power as needed and allows you to focus all your attention on driving.
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.
Display Bosch Purion 200
Control unit with compact colour display and fully networked Smart System. The Purion 200 offers a range of features for an even better ride. For example, in addition to basic functions such as switching the e-bike on and off and lighting, you can also activate the smart push assistant with the Purion 200's buttons to make pushing your e-bike while walking easier. At the touch of a button, you can change the display in seconds and easily select the information that's important to you at the time: for example, keep track of the remaining range, see how far you've gone or check your pedalling frequency.
The same passion that led the original enthusiasts to build the first electric bike continues to drive them forward – to enjoy the pleasure of creating the best electric bikes and bringing them to others. Rock Machine is the life passion and mission of the company's designers, and riding their e-bikes will bring you the same great feelings. Rock Machine is a Czech bicycle manufacturer with a long tradition (since 1994) that combines practical development, affordability, reliable components and fun design.
Manufacturer: BIKE FUN INTERNATIONAL s.r.o., Areal Tatry 1445/2, 742 21 Koprivnice, Czech republic, e-mail: info@bikefunint.com, phone: +420 720 771 501, web: www.rockmachinebikes.com
Parameters
General
| Model year | 2025 |
| Brand | Rock Machine |
| Frame size | Frame M, Frame L |
| Load capacity | 120 kg |
| Colour | Grey |
Motor
| Engine manufacturer | Bosch |
| Engine type | Bosch Performance Line CX Gen. 4 - Smart |
| Torque | 85 Nm |
| Centre engine | Yes |
Battery
| Charger | Bosch 2A |
| Battery capacity | 600 - 699 Wh |
| Precise capacity | 625 Wh |
Transmission
| Number of gears | 1x8 |
| Shifter | Shimano ESSA RD-U2000 |
| Cassette | Shimano, ESSA, 8-speed, 11-45T |
| Sorting | Shimano, SL-M315 |
Components
| Saddle | SELLE ROYAL Essenza Moderate |
| Racks | STARS J30D, Disc, 32H |
| Saddlebag | Suspended, One1 Alloy, ø 30,9 mm |
| 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 |
Brakes
| Front brakes | Shimano MT200, hydraulic, 180 mm |
| Rear brakes | Shimano MT200, hydraulic, 180 mm |
Suspension
| Front fork | RST Blaze, 100 mm |
Questions
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