Campagnolo Record Pista touches frame with 111mm bb when flexing
04-06-19, 08:21 PM
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Campagnolo Record Pista touches frame with 111mm bb when flexing
Clearance non-drive side is <1mm between crank arm end and the frame (drive side is fine). It's a fixed gear frame (Engine 11 CritD) and the bottom bracket is the official Campagnolo Record Pista BB (68x111mm).
When I put some power on the crank (e.g., while skidding) the NDS touches the frame and one can hear a very loud clonk when the frame moves out of the way eventually allowing the crank to pass. No visible damage to the frame.
I've heard different things from different bike mechanics (clearance is fine; you need at least a 115mm; etc.) so I was wondering what the right solution is here. My current plan is to get a 113mm which will hopefully be enough? But I'd rather not spend money on hope.. any advice?
When I put some power on the crank (e.g., while skidding) the NDS touches the frame and one can hear a very loud clonk when the frame moves out of the way eventually allowing the crank to pass. No visible damage to the frame.
I've heard different things from different bike mechanics (clearance is fine; you need at least a 115mm; etc.) so I was wondering what the right solution is here. My current plan is to get a 113mm which will hopefully be enough? But I'd rather not spend money on hope.. any advice?
04-06-19, 09:22 PM
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This idea may go over like a lead balloon, but I've done some filing and smoothing to the back corner of a crank arm to get frame clearance. Polished well, it can be hard to notice.
04-07-19, 08:11 AM
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A 113 is only 1 mm per side, so I don't think that will work out well. The 115 is what I would buy as minimum unless someone else has a better idea. As for filing a Campy crank, that would be sacrilegious.
04-07-19, 11:05 AM
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slave to the proper chainline, fixie?
Another option ; put a clearance dimple in the chainstay.. with a ball peen hammer.
Maybe find as S bend (Road?) left crank arm ..
...
Maybe find as S bend (Road?) left crank arm ..
...
Last edited by fietsbob; 04-07-19 at 11:09 AM.
04-07-19, 11:09 AM
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Other ideas in my head rn
- one size larger frame
- replace cranks with Sugino 75
- buy a road bike
Last edited by rndstr; 04-07-19 at 11:14 AM.
04-07-19, 11:17 AM
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A 113mm should add 1mm per side and only affect the chainline by 1mm. If your frame isn't too noodly, 1mm of extra clearance might be all you need.
A larger frame isn't likely to help, but shorter cranks could, if you're running the 170mm length.
A larger frame isn't likely to help, but shorter cranks could, if you're running the 170mm length.
04-07-19, 11:27 AM
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I run the shortest 165mm.
According to https://www.businesscycles.com/tr-refspec.htm changing the cranks should help too, the Campis have a 4mm narrower q factor than all the other common cranks.
But it's a shame I can't use the best option, feeling disappointed by this frame.
According to https://www.businesscycles.com/tr-refspec.htm changing the cranks should help too, the Campis have a 4mm narrower q factor than all the other common cranks.
But it's a shame I can't use the best option, feeling disappointed by this frame.
04-07-19, 12:26 PM
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I personally like a low Q factor, it's a bummer when things don't play well together. Have you let "Engine11" know? Sometimes if a manufacturer knows that certain parts won't work on their frame, they'll put out a notice, or (hopefully) redesign.
Some cheaper fixed-gear stuff is designed around a wider chainline and Q factor, hopefully that's not the case here.
Some cheaper fixed-gear stuff is designed around a wider chainline and Q factor, hopefully that's not the case here.
04-07-19, 02:42 PM
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I personally like a low Q factor, it's a bummer when things don't play well together. Have you let "Engine11" know? Sometimes if a manufacturer knows that certain parts won't work on their frame, they'll put out a notice, or (hopefully) redesign.
Some cheaper fixed-gear stuff is designed around a wider chainline and Q factor, hopefully that's not the case here.
Some cheaper fixed-gear stuff is designed around a wider chainline and Q factor, hopefully that's not the case here.
As far we we know that no customers ever had an issue having any type of crankset so far.
We tried multiple different BBs and cranks. It seems like all cranks fit properly and works great.
We had some cranks were a bit closer than other cranks but never touched or rubbing the chainstay.
We tried multiple different BBs and cranks. It seems like all cranks fit properly and works great.
We had some cranks were a bit closer than other cranks but never touched or rubbing the chainstay.
Hmm, it does not look bent in the picture to my eyes?
04-07-19, 03:27 PM
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Maybe Real Track Competition Frames are stiffer than consumer frames feeding the street fixie market niche..
Builders May also curve the chainstay late, staying parallel, then flaring out to meet the dropout width requirements ...
...
Builders May also curve the chainstay late, staying parallel, then flaring out to meet the dropout width requirements ...
...
04-13-19, 12:00 AM
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Brief update, I replaced them with Sugino 75 (same Campignolo 111mm BB) and I got more than enough clearance now. I guess I could replace it with the Sugino 109mm but it doesn't matter that much, I'm satisfied.
Still slightly disappointed by the frame (could list niggles but also had a Dolan before which is hard to compete against) but also happy to support a small LA cycling team that I've seen grow over the years
Still slightly disappointed by the frame (could list niggles but also had a Dolan before which is hard to compete against) but also happy to support a small LA cycling team that I've seen grow over the years
04-13-19, 11:24 PM
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Track racing? matched sprint or pursuit? sprint forces are on the front power down stroke
not the back side you point your camera towards..
Only skid stopping a street fixie could possibly have arm move into the chainstay. ..
Advantage: Phil Wood Co. California made BB is their offset can be changed ,
Because the spindle is a precise fit inside the bearing, so it can be pulled through
altering the chain line to The R <> L ...
...
not the back side you point your camera towards..
Only skid stopping a street fixie could possibly have arm move into the chainstay. ..
Advantage: Phil Wood Co. California made BB is their offset can be changed ,
Because the spindle is a precise fit inside the bearing, so it can be pulled through
altering the chain line to The R <> L ...
...
Last edited by fietsbob; 04-14-19 at 11:24 AM.
04-14-19, 11:07 AM
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I would simply have gotten a spacer to fit between the BB shell and the drive side BB flange. A couple bucksif that, and it would have put the crankarm right where it needed to be.
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04-14-19, 02:50 PM
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The issue was on the NDS, though. I'm still curious if the crank arm was slightly bent inward...
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