Time for a change.
Join Date: Jan 2004
Location: 6 miles inland from the coast of Sussex, in the South East of England
Bikes: Dale MT2000. Bianchi FS920 Kona Explosif. Giant TCR C. Boreas Ignis. Pinarello Fp Uno.
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Unless you are prepared to change all 3 rings, remember that the recommended maximum spread of teeth on the front derailler is 22t. This can be stretched to 24t, so if you stay with your 30--30+24= 54..
Some riders do manage to get a spread of more than 24t, but If you ask them, front gearchanges can be a bit hit and miss.