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@Jimmy_Fingers
Reserrecting this thread for some aid: first few rides on a fixed and thinking I need a bigger gear. I'm on a 42:16 which is about 70" but feeling I can't put the hammer down as much as I like and it feels a bit spinney. Don't think I need to increase massively, but a bit bigger I think is needed (particularly for the downhills: I live in Cheltenham). Do I need to change both cogs? Or maybe just the front one to 44/46?