The Gates S250 crankset has a partially matt, partially polished finish, and comes with a pre-mounted CDN belt drive sprocket and an aluminium protection ring. This saves time when setting up the belt drive for your city bike.

Specifications:

Application:

City

Belt sprocket attachment:

130 mm bolt circle diameter, 5-arm

Technical Information:

Series:

CDN

Crank Arm Material:

Aluminium

Belt drive sprocket material:

Composite

Gradation:

46 tooth, 50 tooth, 55 tooth

Crank Arm Length:

170.0 mm, 175.0 mm

Belt line:

depends on the gear hub

Compatible BSA Shell Width:

68 mm

Recommended Bottom Bracket:

4-sided JIS (e.g. Shimano BB-UN300, Thun Zumba)

Belt (rec.):

CDN belt (tooth pitch 11 mm)

Note from the manufacturer:

The CDN system is not approved for mountain bikes, e-bikes with a mid-motor or gearbox, bikes without gears, or touring bikes.

Features:

• CDN level: cost-effective CenterTrack variant
• suited for city and asphalt roads
• middle guide groove (CenterTrack)
• crank with mounted CDN pulley: time saving during set-up
• with belt protection ring made of aluminium, mitigating damage
• generates the required belt line
• black anodised crank arms (partially matt, partially polished)

Technology:

Gates Carbon Drive System
The main advantages of the Gates Carbon Drive system are cleanliness, smoothness and robustness. Urban commuters as well as mountain bikers, e-bike users or leisure riders benefit from the high mileage. Oil-stained or rusty chains are a thing of the past.
Clean: No lubricant means no accumulation of grease and dirt.
Smooth and silent operation: no metal-to-metal contact of the chains.
Light: The whole system weighs less than a standard bicycle chain.
No elongation: Belt does not need to be re-tensioned or replaced.
Self-cleaning: CenterTrack and MudPort profiles are specially designed to repel mud, dirt, snow or other contaminants.
Consistent efficiency: The drive boasts a long service life compared to that of a conventional chain, where efficiency is significantly reduced by wear or dirt.
Installing a Gates Carbon Drive Belt Drive requires a specially-made frame, therefore we strongly advise against using one to modify a conventional framework.

Manufacturer Numbers:

170.0 mm 46 tooth:

FC250 170 BKC465 CDN000 GDBK

175.0 mm 46 tooth:

FC250 175 BKC465 CDN000 GDBK

170.0 mm 50 tooth:

FC250 170 BKC505 CDN000 GDBK

175.0 mm 50 tooth:

FC250 175 BKC505 CDN000 GDBK

170.0 mm 55 tooth:

FC250 170 BKC555 CDN000 GDBK

175.0 mm 55 tooth:

FC250 175 BKC555 CDN000 GDBK

Contents:

• 1 x Gates S250 right crank arm
• 1 x Gates S250 left crank arm
• 1 x Gates CDN Belt Drive Sprocket, mounted (46, 50 or 55-tooth)
• 1 x Gates protective ring, mounted
• 2 x crank bolts