ok.. i did the FixMeUp thing and came up with a number of 47....is that the length of chain that will provide the proper chain tension w/out a tensioner?... i have a 38 tooth front ring running to either a 16,15,or 13 tooth rear cog(have the 16 on right now). the chainstay is 42.4 cm long if anyone wants to check my math
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