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tbc-
66/16 should be fine
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Is there a chain long enough to run a 66t chainring with a rideable gearing?
Unless you have super long stays, 66/18 (~97") is going to need links taken out of most track chains. If you want town bike gearing, your problem is really finding a 26T fixed sprocket, because if 110 link chains don't fit there are always Wippermann's extended e-bike versions, 1E8 comes in lengths up to 136 links
umop3pisdn
gbj_tester
Dunno if these have been posted here yet, super expensive, but surely the bigger ones would be alright for you fixed tt'ers