37
b
a
6.7.3 Adjusting the chain Tension of Single Speed Bicycles
and multi-Speed Hubs.
The chain tension of single speed bicycles has to be checked and re-
tensioned, if necessary, after approx. 1,000 km (620 miles) or 50 hours
of use. The amount of play, midway between chainring and sprocket,
should not be more than two centimetres
(a)
.
Release the rear wheel axle bolts or nuts with an appropriate tool.
Adjust the chain tension by pulling the rear wheel to the rear or by re-
leasing/tightening the chain tensioner. The chain tension is correct when
the amount of vertical play midway between chainring and sprocket
does not exceed two centimetres with a tightened rear wheel. Check the
vertical play in several areas. Furthermore, you should be able to rotate
the crank without resistance.
Adjust the rear wheel in the centre of the rear drop-outs by using the
chain adjuster as limit stop.
Tighten the rear wheel axle nuts with a torque wrench.
The chain adjusters
(b)
only serve to tension the chain and
to pre-adjust the rear wheel. They are not designed to fix the
wheel in its position or to avoid any falling out.
