Kona Kilauea - Chain Rub

[ant_8u]

Hi Guys,

I’m very nearly finished building my bike, but I’m having issues with the chain rubbing the inside of the front derailleur when on the inner chainring.

I’ve set the limit screws and indexed the gears, but can’t get the required clearance for the inner chainring.

Even with the lower limit screw backed out all the way, and the gear cable removed, the derailleur still touches the chain.

The outer chainring has no problems.

Any ideas what I’m doing wrong?

1996 Kona Kilauea
Shimano UN71 BB 68x107
XT-739 Front Mech
XT-737 Crank

Thanks.

 

[LongboardSi]

Assuming your front mech is straight, I'd guess you need a slightly wider BB...

Si F

 

[al-onestare]

Assuming your front mech is straight, I'd guess you need a slightly wider BB...

Si F

Exactly that. From experience 110mm is spot on, 112mm is fine too.

 

[mk one]

Yep, longer bb. I would go with Al's suggestion 110mm