Crank arm play, what should I do?
12-20-19, 09:09 PM
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Crank arm play, what should I do?
This'll be my first fixed gear build, so i apologize in advance if my obliviousness is insufferable. But basically, i've finished installing everything except my crankset, its on the bike, but the crank arm is wobbling an awful lot no matter how hard i crank that thing down. Im wondering if i should get some spacers, or if im just not installing something correctly?
Bottom bracket shell is 68mm
Bottom bracket: SRAM GXP's
Crankset: SRAM Omniums
video showcasing wobble: imgurcomf26nppn (couldnt post links so i improvised, im sorry. Dot between imgur and con, and slash between com and f26nppn)
Bottom bracket shell is 68mm
Bottom bracket: SRAM GXP's
Crankset: SRAM Omniums
video showcasing wobble: imgurcomf26nppn (couldnt post links so i improvised, im sorry. Dot between imgur and con, and slash between com and f26nppn)
Last edited by ssonny; 12-20-19 at 09:12 PM.
12-20-19, 09:54 PM
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This'll be my first fixed gear build, so i apologize in advance if my obliviousness is insufferable. But basically, i've finished installing everything except my crankset, its on the bike, but the crank arm is wobbling an awful lot no matter how hard i crank that thing down. Im wondering if i should get some spacers, or if im just not installing something correctly?
Bottom bracket shell is 68mm
Bottom bracket: SRAM GXP's
Crankset: SRAM Omniums
video showcasing wobble: imgurcomf26nppn (couldnt post links so i improvised, im sorry. Dot between imgur and con, and slash between com and f26nppn)
Bottom bracket shell is 68mm
Bottom bracket: SRAM GXP's
Crankset: SRAM Omniums
video showcasing wobble: imgurcomf26nppn (couldnt post links so i improvised, im sorry. Dot between imgur and con, and slash between com and f26nppn)
12-21-19, 04:53 AM
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I'm fairly certain that you have forgotten to put the non-drive side spacer/dust cover on (part #1 in the image) before installing the crank arm. Without that part, the crank arm will always be loose.
12-21-19, 09:23 AM
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I'm fairly certain that you have forgotten to put the non-drive side spacer/dust cover on (part #1 in the image) before installing the crank arm. Without that part, the crank arm will always be loose.
12-21-19, 09:33 AM
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This'll be my first fixed gear build, so i apologize in advance if my obliviousness is insufferable. But basically, i've finished installing everything except my crankset, its on the bike, but the crank arm is wobbling an awful lot no matter how hard i crank that thing down. Im wondering if i should get some spacers, or if im just not installing something correctly?
Bottom bracket shell is 68mm
Bottom bracket: SRAM GXP's
Crankset: SRAM Omniums
video showcasing wobble: imgurcomf26nppn (couldnt post links so i improvised, im sorry. Dot between imgur and con, and slash between com and f26nppn)
Bottom bracket shell is 68mm
Bottom bracket: SRAM GXP's
Crankset: SRAM Omniums
video showcasing wobble: imgurcomf26nppn (couldnt post links so i improvised, im sorry. Dot between imgur and con, and slash between com and f26nppn)
What is moving relative to what? How much play/wobble in mm? What orientation is the motion?
What exactly are you "cranking down"?
12-21-19, 09:52 AM
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I just watched your video and that's not supposed to happen. Something is wrong with the non drive side bearing/cup assembly. It looks like someone installed a drive side bearing in the non-drive side. The drive side has a 24mm internal diameter and the non-drive is 22mm. Is this brand new?
With GXP, the non drive bearing is captured between the crankarm and a shoulder on the spindle. There should not be any movement in the direction your video shows, even without the drive side cup installed, so spacers are not the problem.
With GXP, the non drive bearing is captured between the crankarm and a shoulder on the spindle. There should not be any movement in the direction your video shows, even without the drive side cup installed, so spacers are not the problem.
12-21-19, 09:59 AM
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I just watched your video and that's not supposed to happen. Something is wrong with the non drive side bearing/cup assembly. It looks like someone installed a drive side bearing in the non-drive side. The drive side has a 24mm internal diameter and the non-drive is 22mm. Is this brand new?
With GXP, the non drive bearing is captured between the crankarm and a shoulder on the spindle. There should not be any movement in the direction your video shows, even without the drive side cup installed, so spacers are not the problem.
With GXP, the non drive bearing is captured between the crankarm and a shoulder on the spindle. There should not be any movement in the direction your video shows, even without the drive side cup installed, so spacers are not the problem.
Last edited by ssonny; 12-21-19 at 10:04 AM.
12-21-19, 10:21 AM
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I doubt that you installed the cups on the wrong side. They are threaded opposite of each other and would have been very difficult to install on the wrong side. If the bearing is wrong, it happened at the factory.
12-21-19, 10:31 AM
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bearing/
appears the crankarm is secure.what I see is the bearing OD moving.with the arm removed will the bearing fall out or feel loose? maybe a counterfeit crankset with low quality BB?
12-21-19, 10:43 AM
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12-21-19, 11:01 AM
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Your earlier post mentioned that you hadn't installed the dustcap/washer part. Do you still have this? It's kind of necessary.
If not, you can buy a kit with the proper washers from Amazon:
https://www.amazon.com/Bottom-Bracke...s%2C137&sr=8-4
Of course, check to ensure that this kit matches up properly with your BB. If you can't find a match, I think the BB itself is around 30-40 bucks.
If not, you can buy a kit with the proper washers from Amazon:
https://www.amazon.com/Bottom-Bracke...s%2C137&sr=8-4
Of course, check to ensure that this kit matches up properly with your BB. If you can't find a match, I think the BB itself is around 30-40 bucks.
Last edited by WizardOfBoz; 12-21-19 at 11:05 AM.
12-21-19, 12:06 PM
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12-21-19, 09:49 PM
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