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After Tire Removal and Install, Gears Slip Cassette

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After Tire Removal and Install, Gears Slip Cassette

Old 05-26-18, 07:47 AM
  #1  
WinterSky
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After Tire Removal and Install, Gears Slip Cassette

Before I go ahead and take my Giant ATX 2 into the shop I wanted to see if this is something I could resolve.. was hoping to get some insight. I recently moved, and in order to do so, naturally I had to load the bike up into my wife's SUV which meant removing the wheels. Once I settled down and got the bike back out, I went riding for the first time and once I hit a hill and downshifted into rear 1 and front 1, the chain slipped the rear cassette and fell into the groove between the cassette and the chain stay.
This has happened a couple of times now. Does this issue usually resolve once the chain syncs back into place or is this something I need to have looked at?
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Old 05-26-18, 07:53 AM
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trailangel
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Do you have auto sync chain?
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Old 05-26-18, 08:37 AM
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Welcome to the forum.

My guess is that the derailleur got pushed out of adjustment (that shouldn't happen), causing the problem. Inspect the parts to ensure that nothing is loose that should be tightened.

Many derailleurs have screw adjustments for the end stops that limit the chain from travelling past the largest or the smallest cog. It may be that the problem can be resolved by an adjustment to the correct limit screw.
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Old 05-27-18, 05:57 AM
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dsbrantjr
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Since this has happened before, I wonder if you are not getting the rear wheel installed in the same position in the dropouts each time. I set the bike on its wheels and let gravity position the wheel, then tighten the QR, to get a consistent positioning.
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Old 05-27-18, 06:41 AM
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I set the bike on its wheels and let gravity position the wheel, then tighten the QR, to get a consistent positioning.

Why didn't I think of that.....

You sir are a genius!
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Old 05-27-18, 09:39 AM
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Originally Posted by WinterSky View Post
Before I go ahead and take my Giant ATX 2 into the shop I wanted to see if this is something I could resolve.. was hoping to get some insight. I recently moved, and in order to do so, naturally I had to load the bike up into my wife's SUV which meant removing the wheels. Once I settled down and got the bike back out, I went riding for the first time and once I hit a hill and downshifted into rear 1 and front 1, the chain slipped the rear cassette and fell into the groove between the cassette and the chain stay.
This has happened a couple of times now. Does this issue usually resolve once the chain syncs back into place or is this something I need to have looked at?
Most likely the 'H' high limit screw is mis-adjusted, allowing the derailleur to move out a bit too far.
I usually make adjustments about 1/4 - 1/2 turn at a time, and retest. In this case it would be clockwise, so the screw hits the "stop" sooner.

Less likely, the derailleur or hanger that it attaches to is bent outwards (rare) causing it to overshift.

Derailleurs and hangers usually get bent inwards towards the wheel, risking over shifting into the spokes,

I wouldn't think minor positioning changes in the dropouts would cause overshifting
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Last edited by Homebrew01; 05-27-18 at 09:43 AM.
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