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Does anyone know if I can get away with a 30t cassette?
Nearly always, but keep an eye on total capacity too if you're using two chainrings.
RD-2400-GS or RD-R2000-GS would be your modern wide ratio road mech that's natively 8-speed.
gbj_tester-
Cheers @gbj_tester, the first one will do nicely - it's even silver : )
.gaz.
Working on a new road bike for my girlfriend.
It has a more or less complete Shimano 600 tricolore groupset, with a very short cage rear mech. Does anyone know if I can get away with a 30t cassette?
If not, what are the compatible options for a longer-cage Shimano 8 speed rear mech?