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Old 03-12-14, 04:25 AM   #1
keyven
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Need some engineering advice (M6R Rack Skate Wheel - only one keeps coming off)

So I've replaced the EZ Wheels on my M6R with 76mm skate wheels, but for some reason one of the bolts keeps loosening and threatening to fall off.

I can't figure out why a single skate wheel has almost fallen off like 4-5 times while the other 3 wheels are still perfectly secure. All the bolts and nuts were purchased brand new - 2 x M5 and 2 x M6 - at the same place with the same specs. They were fixed with the same number of reused washers on both sides.

I'm sure there must be a perfectly common explanation for this somehow, yet I can't think of it. Any suggestions would be appreciated - especially if it doesn't require extra $ like buying Loctite.
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Old 03-12-14, 05:02 AM   #2
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Check that the threads on the bike are not damaged. As well as Loctite you could try a small spot of superglue or wrap PTFE tape around the screw before screwing it in, if you have those things already to hand.
Is the bearing on the skate wheel rolling freely? If its is damaged or tight it may be rather than the bearing rolling it is rotating the screw.
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Old 03-12-14, 05:29 AM   #3
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A small tube of loctite is not too expensive and useful to have around.
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Old 03-12-14, 07:46 AM   #4
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rack back bolts have Nylok nuts , 5mm , You might get new nuts of type ..

perhaps you got plain ones .. the bungee mount spacer may not take to hard crushing tightening .

EZ wheels ship in 2 versions rear is for the 5mm bolt, front is for a 6mm


IDK what the bearing ID is on your skate wheels.. may be sloppy bushing fits.

Last edited by fietsbob; 03-12-14 at 03:08 PM.
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Old 03-12-14, 02:32 PM   #5
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Rollerblade wheels are supposed to be fitted to skate chassis with a spacer to touch just the axle and not the bearing. Alloy chassis skates usually have a protution instead.

Any way back to bikes, I wounder if your first washer is a tad big and is brushing against the rotating bearing surface . other problem might be the axle length is slightly out and is causing a simular problem.
I bought some fantastic , but cheap carbon speed Rollerblades with no spacers incuded and had to make some up from cut down axles. They sound great when they roll , almost like ice skates
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Old 03-12-14, 04:04 PM   #6
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Quote:
Originally Posted by mconlonx View Post
A small tube of loctite is not too expensive and useful to have around.
This. Loctite doesn't just fix probs,it also prevents them.
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Old 03-12-14, 08:02 PM   #7
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Originally Posted by bhkyte View Post
Rollerblade wheels are supposed to be fitted to skate chassis with a spacer to touch just the axle and not the bearing. Alloy chassis skates usually have a protution instead.

Any way back to bikes, I wounder if your first washer is a tad big and is brushing against the rotating bearing surface . other problem might be the axle length is slightly out and is causing a simular problem.
I bought some fantastic , but cheap carbon speed Rollerblades with no spacers incuded and had to make some up from cut down axles. They sound great when they roll , almost like ice skates
The washer is the same as all the other washers - all came from the original EZ wheels setup. The ONLY thing my non-technical brain can come up with was "maybe I put the washer on the wrong side???"

Otherwise, the problem wheel, nut, bolt,washers is identical to all the other wheels,nuts,bolts,washers - same brand, same model, same shop.

I guess I might have to go with Loctite.
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