35
Synchronization
Some U-brakes are equipped with two bolts for the adjustment of the brake’s initial
spring tension. These are located on the axle on which the brake arms pivot around
and are fixed to the frame. Hold the outer sleeve nut with a spanner in its original
position and loosen the inner Allen bolt (a).
Continue by carefully adjusting the outer adjustment nut with the spanner until the
distance between brake pads and rim is the same on either side. Retighten the
inner Allen bolt, when both pads are in the correct position. Do not exceed the
recommended torque.
There are U-brakes of other designs which have a bolt located next to one or both
brake pad for the adjustment of the initial spring tension. Adjust this bolt carefully
(b) until the distance between brake pads and rim is the same on either side.
Back-pedalling brake (coaster brake)
Except from some cruiser and children’s bikes, this type of brake is hardly used
any more. The brake mechanism is fully enclosed and it is combined with a geared
hub (c).
The back-pedalling brake is actuated by pedalling backwards. For maximum brak-
ing power, step on one of the pedals in its rearmost position, with the cranks hori-
zontal.
If your bike has a back-pedalling brake you should occasionally check the tension
of the chain. The amount of play, midway between chainring and sprocket, should
not be more than two centimetres.
Check regularly whether the coaster brake bracket is still firmly attached to the
frame or fork (d).
Back-pedalling brakes get hot in use! Do not touch the brakes, especially
shortly after stopping, especially after long downhill rides.
For more information on your brake model, visit the websites of the respective
manufacturers, e.g.:
www.shimano.com
www.sram.com
www.tektro.com
a c db
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