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I thought the point of the calculator was to determine whether you needed to buy a chain?
Best to size the chain on the bike. Also, if there's a bit of a window of possible length, I go for the longer length to add a couple of percent of chain longevity, even on my weight weenie bike.
This is probably the biggest actual benefit of OSPWs, because you need more chain to go around them - even if you do what I do and just jam the biggest pulleys you can fit in the stock cage.
Kimmo
@M_V
Cheers will consult both before shortening the chain to ensure I m doing so to the correct length.