Did these while coming off nicotine (something to do in the first few days of not smoking)
seatpost clamp only took 4 hours and I polished the wrong side....
I assume you mean the sprocket size. I run 13, 14, 15, 16, 17, 19, 21, 24 on a 53 x 39 (standard crankset) - I don't have a large cassette as my rear mech will only go to 26T. It's down to my racing days - you tend to run a straight through block as much as possible - i.e. only 1 or 2 tooth jumps. The 24 is a bail out !
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