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@gbj_tester
Both look to be running about 32/20, which is about 45" on a niner. Not many people go much over 2:1 on 26" XC bikes, which is about 53", unless they're on consistently flat terrain. I run 27/13 on my 26" bike, but that's for river bank rides. At Swinley, 27/15 would be better for playing.