E-bikes City Rock Machine eRokk B90 City 27.5 e-bike, matte nightstorm blue

Rock Machine

Rock Machine eRokk B90 City 27.5 e-bike, matte nightstorm blue

Name: Rock Machine eRokk B90 City 27.5 e-bike, matte nightstorm blue
Price: 3599.0 EUR
Availability: LimitedAvailability

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3,599 €

RRP 3,699 €

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Product description

Rock Machine eRokk B90 City 27.5 electric bike

Aluminium frame

Lighter, relatively durable and stiff material that is affordable. The most widespread material for the production of bicycle frames.

27.5” wheels

Universal size for a wide range of bicycles. The advantage is better cross-country ability, higher traction and comfort, and still good dexterity. Slightly heavier.

Hydraulic disc brakes

Reliable in all conditions, better modulation of the braking effect with the use of less force on the lever. Heavier weight, more demanding service.

Air fork

The best option in terms of weight and comfort. Provides more adjustment options (rebound, compression). Requires regular service - the service cycle is specified by the manufacturer.

Specification

Drive	Bosch PerformanceLine CX, Smart System, 36 V, 250 W, 85 Nm
Battery	Bosch Battery Power Tube 750 Wh
Display	Bosch Kiox 300
Frame	Aluminum monotube frame for Bosch CX Performance Smart System drive unit, Up to 750 Wh battery, 29/27.5 wheels compatible. Ready for dropper seat post and suspension dropper seatpost.
Fork	RockShox Judy Silver TK, Tapered, SoloAir, 15x110 mm axle, 100 mm travel
Shifting	Shimano Cues SL-U6000 RapidFire Plus, 10 speed
Derailleur	Shimano RD-U6000
Cassette	Shimano CS-LG300-10, 11-48T
Chain	Shimano CN-LG500
Crankset	ONE1 EC39-BH4-F13-ISIS-L/R, 38T
Brakes	Shimano MT200
Brake discs	Shimano SM-RT10, 180 mm/180 mm
Rims	Stars J30
Front hub	Shimano HB-TC500-15-B
Rear hub	Shimano FH-QC300
Spokes	Sapim Leader, Stainless Black with secure lock nipples
Tires	WTB Groov-E Comp, 27.5x2.40"
Seat post	ONE1 Alloy, SP S405, 30.9 mm
Saddle	Selle Royal Essenza Moderate
Stem	TDS-C342 Alloy, 31.8 mm, e45, +3°
Handlebars	Velobel, aluminium riser 40, ergo handlebar
Grips	Herrmans Click DD37
Headset	Acros ZS56/ZS56
Pedals	Flat, Glass Fiber Reinforced Nylon, with reflector
Mudguards	Alloy Full Cover Fenders
Bell	Widek Paperclip e-bike
Front light	AXA Blueline 30
Rear light	Spanning Pling XE
Pannier rack	Delta Carrier, AVS, max. load 27 kg
Stand	Atran Velo Rex
Lock	AXA Block XXL

Product details

Sex	Men, Women, Unisex
Model year	2025
Gears	1x10
Groupset	Other
Colour	blue
Material	aluminium
Wheel diameter	27.5"
Drive	Bosch Performance CX
Battery	800 Wh
Brakes	Hydraulic disc brakes
Fork	Air
Fork travel	100 mm
product ID	347474
EAN

Due to long-term issues with the supply of components, some manufacturers exceptionally approach changes of installed components contrary to the specification without letting us know. Unfortunately, it is not in our power to go through each bike and verify the differences between the manufacturer's stated components and its actual equipment. Alternative parts should meet the same standards as the original. We apologise for any discrepancies.

Size chart

Each Rock Machine bicycle model has its own specific geometry and size chart, which can be found on the manufacturer's website for the given bicycle.

How we ship bikes

All bicycles at the MTBIKER shop are new, not-ridden, from an official distributor and with a full warranty. Several brands even offer a lifetime warranty on the frame after registration. We perform all warranty services in MTBIKER stores after personal delivery or after sending the bike (or its part) by courier.

Our bike shipment is as follows:

The bicycle is taken out of the manufacturer's box
The bicycle is assembled, inspected and adjusted (front and rear derailleur, shock, fork, wheels,...)
The bicycle is carefully packed back into a box and shipped
If you order a bicycle for in store pickup or home delivery, the bicycle will be waiting put together, checked and ready to use for you.
If you order a bicycle via courier to your home address, the following must be done at home:
1. Take the bike out of the box and carefully remove safety material and foils
2. Mount handlebar to stem (1 minute, 4 or 5 mm hex hey is needed).
3. Mount front wheel to fork (1 minute, without the need of any tools if the bike has a quick release).
4. Loosen the screws in the headset, straighten the stem with the front wheel, tighten the upper screw on the fork and then tighten the headset (2 minutes, 4 or 5 mm hex key is needed).
5. Mount the pedals to the cranks while lubricating the thread and carefully mounting it the right way (1 minute, 8 mm hex key or 15 mm wrench).
6. Mount seatpost to frame (10 seconds, without needing any tools if the frame has a quick link).
7. Inflate the tires or fork and shock to desired pressure (2 minutes, pump needed).
8. Check the tightening of hex keys and quick-releases (2 minutes, 4 and 5 mm hex key is needed).
9. Go for a test drive! Handle your bicycle carefully until you get used to it. If the bike has disc brakes, their performance will be limited from now on - they will gain their full power after 4-5 strong brakes at higher speed.

Auxiliary video for setting up the bike:

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City Rock Machine

This Czech brand has been on the market since 1994. They rose thanks to their trail models that combine fair prices and a lot of fun. Rock Machine produces MTB, gravel, cross, e-bikes and junior bikes.

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