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@deleted
As hippy's site says "Not all tablespoons are the same." We need to know whether your baking this cake in Australia, Canada or the UK before we can really help you, robbonjr :)
(If you're referring to 165 or 170, which I'm guessing you are, i'd go for 165 if it's going on a conversion, due to the lower BB height on road specific frames. 165 will make your crank's turning circle a centimetre smaller, which means less leverage which means it's relatively harder to turn the same gear with 165 vs 170. I didn't think i'd be able to tell the difference, but i definitely can. For me the gear ratio 46x17 feels heavier than 48x17 because of the 165-170 difference. I guess it could've been another factor though)