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nev-
Ah, 28 then! I think they can be pushed to a bit more but shifting might be compromised.
http://www.velobase.com/ViewComponent.aspx?ID=c7069264-613f-48e1-8112-d3236e2fd096
dglshrn
What mech is it? I seem to think the older ones were a bit more forgiving with tooth count, but one would assume up to 28 would be fine.