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Crank arm too close?

Old 08-03-09, 08:26 PM
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Tigerprawn
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Crank arm too close?

I just bought a bike... I'll show it off a little later

Anyway, I brought it home and noticed that the non-drive side crank arm is extremely close to the BB shell. This isn't typical is it?

C-Record crank with a C-Record BB. I don't have a camera at the moment, but it's very close. At a quick glance it almost appears there is no space at all. I can spin the cranks freely and I don't think it's obstructed. Any thoughts?


Last edited by Tigerprawn; 08-03-09 at 08:37 PM.
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Old 08-03-09, 08:40 PM
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If its not rubbing its not too close.
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Old 08-03-09, 08:53 PM
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Originally Posted by miamijim View Post
If its not rubbing its not too close.
Thank you Jim. I just wasn't sure and felt it may cause some future problems.
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Old 08-03-09, 09:39 PM
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For a double chainring crank, to have a correct chain-line, the distance from the middle of the chainrings to the center of the downtube should be 43mm; if its much less than this then you need a longer spindle.
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Old 08-03-09, 09:44 PM
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Originally Posted by Tigerprawn View Post
I just bought a bike... I'll show it off a little later

Anyway, I brought it home and noticed that the non-drive side crank arm is extremely close to the BB shell. This isn't typical is it?

C-Record crank with a C-Record BB. I don't have a camera at the moment, but it's very close. At a quick glance it almost appears there is no space at all. I can spin the cranks freely and I don't think it's obstructed. Any thoughts?

Its a Medici, it should have Super Record then all will be a peace with the World.

Looks too close to me, butcould be some Gorilla mechanic long ago did it in.
Have you had the bottom bracket apart?
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Old 08-03-09, 09:46 PM
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Originally Posted by leecycle View Post
For a double chainring crank, to have a correct chain-line, the distance from the middle of the chainrings to the center of the downtube should be 43mm; if its much less than this then you need a longer spindle.
I just measured from in between the chainrings to the center of the downtube and it's ~1 3/4 of an inch or so. ~44 mm

I think the drive side is fine, but the non-drive side was what I was worried about it. Thanks for the info though as I didn't know that 43 mm was the recommended measurement.

Originally Posted by repechage View Post
Its a Medici, it should have Super Record then all will be a peace with the World.

Looks too close to me, but could be some Gorilla mechanic long ago did it in.
Have you had the bottom bracket apart?
repechage, you're good . Indeed a Medici. Crank and BB are both C-Record.

I just received it today, so no chance in servicing the bottom bracket. If a mechanic did push it in that far is the crank arm damaged beyond use now?

Last edited by Tigerprawn; 08-03-09 at 09:50 PM.
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Old 08-03-09, 10:19 PM
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I have a few cranks where the non-drive side arm is very close, although maybe not quite as close as yours. My feeling is that if it is not rubbing and it is not loose, then leave it alone and don't worry about it. It may indeed have been overtightened, however, as long as the bolt has not pulled the spindle flush with the crank arm shoulder, it will continue to stay tight. When the day comes that it needs to overhauled and you pull it, you'll find out if it needs to be replaced.
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Old 08-04-09, 01:25 AM
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I would say it looks too close. It might not be a mechanical problem but it can force you to be seated in a corny way; you will have to compensate a slightly wry and un-balanced riding position. On longer rides that will hurt.
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Old 08-04-09, 03:55 AM
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It's probably OK, but it looks awfully close to me.
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Old 08-04-09, 05:09 AM
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Why not pull it, then reinstall with what you'd consider the proper torque and see if it sits any further out? Even a couple of sixteenths might make a big difference to how it looks.
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Old 08-04-09, 05:21 AM
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Looks quite close, but the perspective of your camera is not directly over the gap; it's centered with the frame, and skews the appearance.

This is purely speculation, but most Nuovos that I've seen mounted on the proper spindle sit rather close on the non-drive side. Not that close, but always much closer then JIS-taper cranksets.

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