Cantilever Geometrie: Unterschied zwischen den Versionen

==Direktzugbremsen (V-Brake)==

The latest thing in cantilevers is the direct-pull cantilever, popularly known by Shimano's trademark "V-Brake". These resemble very tall, low-profile cantilevers, but they do not have a separate transverse cable. They are a side-pull, rather than center-pull design. One arm has the housing stop, and the inner cable runs from the top of that arm to an anchor bolt on the top of the opposite arm. Direct-pull cantilevers have a very high mechanical advantage, which makes them unsuitable for use with conventional levers. If you do use conventional levers with direct-pull cantilevers, braking may be too abrupt. The excessive mechanical advantage of this combination will either cause the brake shoes to rub on the rim when they are at rest, or the brake lever will bottom out against the handlebar, depending on the cable adjustment.

The unit illustrated above is a World Class "V-Daptor." In this case, it has been installed on a conventional Shimano LX cantilever, thus converting a traditional center-pull cantilever into a direct-pull unit. This is a handy way to improve braking on many touring bikes and tandems, but there is not usually enough clearance to let this modification work with fat mountain-bike tires--for them, you need a purpose-built direct-pull brake.

===Parallelogramm Koppelung===

Shimano's XTR and XT V-Brakes feature a special parallelogram linkage. This serves two purposes:

Unfortunately, the extra pivots considerably complicate the mechanism, and this has caused maintenance problems and excessive squeal in practice.

==Hebelübersetzung - Wieviel ist genug?==

Generally, more mechanical advantage is better than less, but it is possible to overdo it.