Details zu Lochkreismustern bei Kettenblättern: Unterschied zwischen den Versionen

*    Pins and ramps involve some compromises. Though teeth may align multiple times around a pair of chainrings, shifting is best near the dead centers of crank rotation, to minimize stress on the front derailer and disruption of pedaling cadence. To meet these criteria, there can be only two sets of pins and ramps opposite each other, and chainrings must differ by a multiple of two teeth. This requirement is met, for example, by a 52-36 or 50-34 racing double pair of chainrings. Chainrings with preferred orientations for shifting cannot be rotated on the crank spider during overhauls to increase wear life. It is conceivable that this problem could be solved using threaded pins that can be removed and reinstalled, but I don't know of any manufacturer offering this feature.

Introducing a novel bolt pattern is easier than it once was .Chainrings used to be stamped out in a huge punch-press machine, like cookies with a cookie cutter, then lightly milled to reduce the thickness of the teeth and to drill mounting holes. Teeth of a 1X chainringA large number of chainrings had to be produced in each size to justify the tooling cost, but unit cost was low. Now, on the other hand, anyone with computer-aided design software and a computer-aided milling machine can establish a new bolt pattern at low cost -- but the unit cost is higher.