Pants are for suckaz
Join Date: Mar 2007
Location: Mt. Airy, MD
Bikes: Hardtail MTB, Fixed gear, and Commuter bike
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Why such large chainrings for timing chain?
I know there must be some reason that tandems use such large chainrings for the timing chain (or belt), I just don't know what it is? I guess maybe the traditional standard BDC spiders allow for swapping out chainrings without some expensive proprietary system but wouldn't using smaller cogs (around 18 teeth) allow for a slight weight reduction, higher ground clearance, and a shorter chain?
Does anyone here know why tandems use [relatively] large chainrings on the timing chain side?