Cycling UK Forum

cycleruk wrote:Regarding the OP, if there is a spacer on the non-drive side then swap it over to the chainring side and try it.
This will of course move the chainset over a couple of mm' but still keep the same overall width and not compromise the left crank fitting.

There are no spacers on the bb. I think that's why Brucey suggested fitting an mtb bb. the 'shoulders' are each 1mm narrower than on a road bb so should allow for a 2mm spacer on the right side. I talked it thorough with the LBS today and we looked at a road bike with a 34.9 seat tube and 6800 group. With the cable disconnected and the limit screw out, the FD is almost touching the frame and there is about 3mm of clear blue sky between the chain and the inner side of the cage in the lowest gear. On mine there is quite a gap between the FD and the frame. My FD is a braze on with the correct adapter [they came together]. The one we were looking at was a band on - I wonder if the band on 6700 FD would sit closer to the frame than braze on + adapter? Opinion seems to be divided on whether my 6700 shifter will work ok with a 6800 FD. Anyway, I've bought a tiny file for £2 and before I spend any more money I'm going to consult Enigma [its an Enigma frame] on Monday and see what they suggest and get them to rule out wonky frame. Happy New Year

cycleruk wrote:Regarding the OP, if there is a spacer on the non-drive side then swap it over to the chainring side and try it.
This will of course move the chainset over a couple of mm' but still keep the same overall width and not compromise the left crank fitting.

There are no spacers on the bb. I think that's why Brucey suggested fitting an mtb bb. the 'shoulders' are each 1mm narrower than on a road bb so should allow for a 2mm spacer on the right side. I talked it thorough with the LBS today and we looked at a road bike with a 34.9 seat tube and 6800 group. with the cable disconnected and the limit screw out the FD is almost touching the frame and there is about 3mm of clear blue sky between the chain and the inner side of the cage in the lowest gear. On mine there is quite a gap between the FD and the frame. My FD is a braze on with the correct adapter [they came together]. The one we were looking at was a band on - I wonder if the band on 6700 FD would sit closer to the frame than braze on + adapter? Opinion seems to be divided on whether my 6700 shifter will work ok with a 6800 FD. Anyway, I've bought a tiny file for £2 and before I spend any more money I'm going to consult Enigma [its an Enigma frame] on Monday and see what they suggest and get them to rule out wonky frame. Happy New Year

Thanks for all the suggestions.
I don't think the frame is out of track but I'll get it checked. I'd have thought there would be other shifting problems if it was. i am also puzzled because the chain line for 6600 series is the same as for 6700 at 43.5mm. I can see that the the 34.9 seat tube will permit less inward travel than a 31.8 or less but I think they are supposed to work with a 34.9 seat tube.

The mtb bb sounds like its worth a try. filing the mech also sounds as though it would work - though fiddly.

it is a double front lever [6700] and i have disconnected the cable and screwed the limit screw right out.

Thanks

DaveP Problem occurred with 'upgrade' from 9 to 10 spd [necessitated by broken lever ]. i suspect as pwa suggested it may be a 6650/6700 compatibility/chainline issue

Thanks

mattsccm - ive tried searches and cant find the answer to the specific question of 6650/6700 chain line though most seem to think they are generally compatible. however I think you are probably right that is where the problem is. Yes I disconnected the cable and completely loosened the stop screw. And I cannot change the axle as you say.

I'll try pwa's suggestion of bending the mech. An alternative might be a 9 speed front mech

My front mech wont move far enough inwards to avoid chain rub when the chain is on the large rear sprocket (+small chain ring). The only way I can get it to work is by angling the front mech inwards [towards the rear] which causes poor shifting and problems in the higher gears. It's not cable tension or inner adjusting screw and I've tried various heights between about 1 - 5mm above the large chainring. The set up us Ultegra 10 spd: compact SL 6650 chainset (50/34), all the rest [shifters, bb, front mech, rear mech, rear hub] is Ultegra 6700. Cassette is 12-30. BB shell is 68mm and chainline is about 43-44mm. Downtube is 34.9mm. So it seems either I need a different front mech [that can travel inwards a couple more mm] or modify the chainline for example by adding a spacer to the drive side of the bb. Is that possible or would it shorten the axel on the left side so the left crank wouldn't fit? There doesn't seem to be any scope to add a spacer to the cassette. Any ideas? Thanks