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@Hardenpeter
This morning I swapped out a heavy pair of halo twinrails for light 1.3 contis (26"). I immediately noticed how much less effort I had to put in using the same gear range as previous day which meant I changed up to the higher gear range off the large chainring. When I put the details into a gear calculator the gear ratio decreased with the smaller tyre so assuming that weight and tread were the main factors but interested in any other views. Tenuous link to this forum is that I will convert to ss but want to have option of swapping wheels - this will present an issue if my tyre choice impacts gear selection. Alternatively I could man up and get my legs stronger for the larger tyre!!