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Need HELP removing rim from fork on BMX bike

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Need HELP removing rim from fork on BMX bike

Old 07-20-16, 07:58 AM
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Gthoro
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Need HELP removing rim from fork on BMX bike

I recently picked up a 1983 GT Pro BMX bike. I am comfortable wrenching on most bikes, but this one has me stumped. As I was taking it apart to clean it up, I tried to remove the front rim with no success. The axle is larger than the fork drop out slots (The axle is round and not slotted). I measured the slots at 8.34 mm and the axle at 9.07 mm. There is also a hex lock spacer between the fork and hub on both sides. A normally easy task has me baffled. If you know how to remove the rim, please let me know and help restore my sanity!

Thanks!


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Old 07-20-16, 08:11 AM
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It got in there some how. obviously . both Axle nuts loose on both sides?

axle flattened on the sides like 3 speed rear hubs are?
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Old 07-20-16, 08:18 AM
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Nuts are completely loosened and the axle is not flattened. Do I just try and strong arm it off? I don't want to damage it.
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Old 07-20-16, 08:31 AM
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make the slot wider? with a Dremel grinder? (take it to a Bike shop now?)

I See Set Screws in the Hub the axle may slip out of the hub sideways ..

Some Past Owner foolishness in that rather cheap Bike there.

Last edited by fietsbob; 07-20-16 at 09:47 AM.
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Old 07-20-16, 09:07 AM
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yeah, what's that set screw? take that out, see what happens
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Old 07-20-16, 09:09 AM
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Originally Posted by RubeRad View Post
yeah, what's that set screw? take that out, see what happens
Yes, when in doubt remove any fasteners you can find and see what comes loose.
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Old 07-20-16, 09:16 AM
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The slot may have been pinched together somehow so grinding or pulling the slot open is ok. You are however missing the stepped washer that should go with that drop out the step should drop in to axle opening to center axle in opening so axle does not move in the larger diameter opening.
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Old 07-20-16, 10:05 AM
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Loosening the set screw and axle nut on the same side may allow the axle to slide out as the hub appears to have cartridge bearings (I believe I see the edge of a black seal for the bearings).
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Old 07-20-16, 10:05 AM
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Hex set screws are loose on both sides. I'm not able to get any sideways movement with the axle. So it looks like it comes down to grinding or spreading. Grinding seems safer. Thoughts?
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Old 07-20-16, 10:16 AM
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You competent? have used the tools needed before ?
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Old 07-20-16, 10:22 AM
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with the set screws loose, can those collars unscrew? Does the whole threaded axle unscrew out the middle? (If the whole axle is threaded, where are the cones for the bearings?)
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Old 07-20-16, 10:27 AM
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Update: before I started grinding, I decided to give the axle ends a few taps with a hammer - success! Rim is off! Now what should I do to the dropout/axle before I reinstall. Thanks for the helpful feedback thus far!
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Old 07-20-16, 10:34 AM
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So the axle slid through the dropouts anyways? Cool.

What should you do? How should we know? Why did you want to take it off?
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Old 07-20-16, 11:08 AM
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Originally Posted by Gthoro View Post
Update: before I started grinding, I decided to give the axle ends a few taps with a hammer - success! Rim is off! Now what should I do to the dropout/axle before I reinstall. Thanks for the helpful feedback thus far!
Should not have to do anything to the dropouts/axle.

Rotate the bearings to make sure they are still smooth, might want to carefully pop off the black seals to check/add grease (use a very pointed probe to pry them off). If the bearings are rough they can be carefully driven out of the hub and replaced (size/spec printed on bearing).

To reassemble just insert the axle through the collars, center the axles, snug both collars against the bearing, and then tighten the set screws and then the axle nuts.

Last edited by cny-bikeman; 07-20-16 at 11:12 AM.
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