james_from_stoke
Retro Guru
Hopefully somebody who has been around a little longer than I have might be able to give me some advice.
I finally put a set of Record 10-speed cranks on my 10-speed Campagnolo bike (I'd been riding it with some Dura Ace cranks I had lying around, until I could source a spare chainring bolt).
I got the cranks with a 102mm Tifosi ITA bottom bracket, so I fitted that. The chainline in the big chainring is great, but terrible in the small chainring - you can only use the largest 5 or 6 sprockets before the chain starts rubbing against the back of the big chainring. Cross-chaining big/big isn't an option, as the lower jockey wheel doesn't sound happy. That rules me out of using useful gears like 39x15 or 53x21.
I decided to buy a Centaur 111mm bottom bracket. I thought an extra 5mm on each side would be a good move - it's only roughly the width of one sprocket, how much difference can it make?
Now I have the opposite problem - chainline is poor in both chainrings, and even 39x26 sounds rough.
Do I just need to accept that riding in the small chainring will sound like a bag of spanners on anything less than the 17t? I don't remember this being an issue on other 10-speed Record bikes I've ridden.
For reference, the shifting was fine with the Dura Ace 7800 53/39. The Record chainset is also 53/39, and the rings are used but nowhere near worn out. Chain is fairly new Campagnolo. Jockey wheels are fine, cassette is within the capacity of the derailleur. Chainstays are not abnormally long, chain seems to be the right length, 130mm rear spacing.
Any ideas? Is there anyone making a 106mm ITA ISO bottom bracket? Do I just need to ride faster to use the big ring more?
I finally put a set of Record 10-speed cranks on my 10-speed Campagnolo bike (I'd been riding it with some Dura Ace cranks I had lying around, until I could source a spare chainring bolt).
I got the cranks with a 102mm Tifosi ITA bottom bracket, so I fitted that. The chainline in the big chainring is great, but terrible in the small chainring - you can only use the largest 5 or 6 sprockets before the chain starts rubbing against the back of the big chainring. Cross-chaining big/big isn't an option, as the lower jockey wheel doesn't sound happy. That rules me out of using useful gears like 39x15 or 53x21.
I decided to buy a Centaur 111mm bottom bracket. I thought an extra 5mm on each side would be a good move - it's only roughly the width of one sprocket, how much difference can it make?
Now I have the opposite problem - chainline is poor in both chainrings, and even 39x26 sounds rough.
Do I just need to accept that riding in the small chainring will sound like a bag of spanners on anything less than the 17t? I don't remember this being an issue on other 10-speed Record bikes I've ridden.
For reference, the shifting was fine with the Dura Ace 7800 53/39. The Record chainset is also 53/39, and the rings are used but nowhere near worn out. Chain is fairly new Campagnolo. Jockey wheels are fine, cassette is within the capacity of the derailleur. Chainstays are not abnormally long, chain seems to be the right length, 130mm rear spacing.
Any ideas? Is there anyone making a 106mm ITA ISO bottom bracket? Do I just need to ride faster to use the big ring more?
