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@pj_(pj)
ok, then you need 1/8 to match sprocket on back, i'm guessing the wheelbuilder put a 1/8 sprocket on there.
1/8 can go with 3/32 on front. 3/32 can only go with 3/32.
so you prob still have original 3/32 chairing on front? or have you changed it? either way should be fine. i've run 1/8 with 3/32 on conversions in the past. is not ideal, but is perfectly adequate.