Join Date: Jun 2010
Location: NW,Oregon Coast
Mentioned: 9 Post(s)
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As Crank arms Only ... They're a 110 BCD type , so how they shift depends on which chainrings you buy
their sizes and whether they are fully featured with ramps, shift pins and tooth profiles
all engineered to make an easier-quicker shift.
Smallest pitch is TA a 33t, that requires a bit of end of the spider machining to clear them with the chain,
typically a 34t is the smallest.. used
BMX is typically a 1 speed , then shifting is a Non Issue.