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Got rid of a compact SRAM rival11 chainset and replaced it with a semi compact 105 5800 chainset as I hated GXP BB lifespan (or lack of).
I'm about to do a hilly sportive kind of similar to the Fred Whitton and as I'm ~16 stone I am worried about the climbs, especially towards the end.
Can I just change the 36t granny for a 34t? It's the same BCD (110) and will give me a quick and cheap option for just this event?
I can't change the cassette without changing the derailuer.
Yes but it won't make much difference.
http://www.hopetech.com/products/drivetrain/bottom-bracket/
one of these fit? Save the crankset fix the BB
That link just defaults to the hope home page, but as it's hope I am guessing it's more than the thirteen quid from Merlin for a new ring?
About 6 % difference which is about 2/3 of a gear.
ah didn't see you had already bought the cahinset
No worries, thanks for the idea for future reference.
http://sheldonbrown.com/gear-calc.html say the gear inches for a 28T sprocket will change from 34.7 to 32.8, not even the equivalent of half a gear compared to having a 32T sprocket (where difference would be 30.4 to 28.7) with a 700x32mm tyre.
Front mech might not like the extra drop, even 50/34 struggles with some set ups. Depending on the mech of course.
I can’t change the cassette without changing the derailleur.
You absolutely positive. i.e. because of what the manufacturer says, or because theirs physically no room?
problem is if you fit a bigger cassette then you may also need a longer chain and / or a smaller front outer ring - and or a larger capacity rear mech...
Which rear mech and cassette do you have currently? You can usually get 2-4 more teeth than the recommended max sprocket size out of it so cheap cassette + a chain might be your best option.
You can also get cheaper versions of that wolf-tooth adapter on ebay for a few pounds - search for 'derailleur hanger extender' but check where its coming from. I ordered one and it came from china so not an instant fix.