can't pedal backwards on Turbo Trainer
01-15-21, 07:41 PM
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can't pedal backwards on Turbo Trainer
I am using XDR hub with 12-speed Force AXS casette.
Basically if i screw my thru axle tight (using a tool), i can't pedal backward, the chain just slack off. I have to loosen the thru axle up a little then I can pedal backwards. If i loseen it, the rear is secure to the trainer as far as I know, but the bike have some side-by-side slack (about 1-2mm slack). I am not sure if it's safe to ride.
Is there something wrong with my installation of the cassette? (too tight? too loose)?
Basically if i screw my thru axle tight (using a tool), i can't pedal backward, the chain just slack off. I have to loosen the thru axle up a little then I can pedal backwards. If i loseen it, the rear is secure to the trainer as far as I know, but the bike have some side-by-side slack (about 1-2mm slack). I am not sure if it's safe to ride.
Is there something wrong with my installation of the cassette? (too tight? too loose)?
01-15-21, 07:58 PM
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The question which comes to mind is why would you want to pedal backwards on a trainer? Does it pedal forward normally?
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01-15-21, 08:29 PM
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Originally Posted by dsbrantjr
The question which comes to mind is why would you want to pedal backwards on a trainer? Does it pedal forward normally?
01-15-21, 10:48 PM
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If some parts need to be less then tightly secured for the system to work well then something is wrong, and is continued to be used like that then don't be surprised if in the future you have big issues.
There are a few possible issues. From something wrong with cassette mounting/spacing on the freehub, something wrong with it's locknut, to something wrong with the freehub/hub bearings to something else all together.
Can you tighten the through axle and see and contact or rubbing about the moving parts (cogs, freehub, frame, other)? Could some other rub be happening (brake, rim, tire) due to improper wheel install or a cocked off center brake?
It's hard to assess what we can't see but these are a few starting points for you to do so. Andy
There are a few possible issues. From something wrong with cassette mounting/spacing on the freehub, something wrong with it's locknut, to something wrong with the freehub/hub bearings to something else all together.
Can you tighten the through axle and see and contact or rubbing about the moving parts (cogs, freehub, frame, other)? Could some other rub be happening (brake, rim, tire) due to improper wheel install or a cocked off center brake?
It's hard to assess what we can't see but these are a few starting points for you to do so. Andy
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01-16-21, 12:19 AM
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Originally Posted by Andrew R Stewart
If some parts need to be less then tightly secured for the system to work well then something is wrong, and is continued to be used like that then don't be surprised if in the future you have big issues.
There are a few possible issues. From something wrong with cassette mounting/spacing on the freehub, something wrong with it's locknut, to something wrong with the freehub/hub bearings to something else all together.
Can you tighten the through axle and see and contact or rubbing about the moving parts (cogs, freehub, frame, other)? Could some other rub be happening (brake, rim, tire) due to improper wheel install or a cocked off center brake? I am not sure how to fix that.
It's hard to assess what we can't see but these are a few starting points for you to do so. Andy
There are a few possible issues. From something wrong with cassette mounting/spacing on the freehub, something wrong with it's locknut, to something wrong with the freehub/hub bearings to something else all together.
Can you tighten the through axle and see and contact or rubbing about the moving parts (cogs, freehub, frame, other)? Could some other rub be happening (brake, rim, tire) due to improper wheel install or a cocked off center brake? I am not sure how to fix that.
It's hard to assess what we can't see but these are a few starting points for you to do so. Andy
As to what happens, basically when tighten the thru axle, the XDR hub i guess is too tightly pressed against the drop out, so that it is not free enough to pedal backwards.
01-16-21, 01:26 AM
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Originally Posted by dsbrantjr
The question which comes to mind is why would you want to pedal backwards on a trainer?
01-16-21, 09:09 AM
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I have always felt that if you cant pedal backwards, something is amiss. Something is not lined up right or adjusted right. That would include making sure the drop out is perfectly straight. Another this is the type and brand of RD. If the low and high screws are not set about equal, there is some sort of alignment problems. On one of my bikes to get the hi/low screws to be about equal when they, were adjusted correctly, I had to put a washer under the RD.
01-16-21, 09:46 AM
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With bike off of trainer, just a sense check -- does the cassette spin freely backwards using your hand?
01-16-21, 11:08 AM
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Originally Posted by tyw214
There is no brake/rim/tire because it's on a direct drive trainer.
As to what happens, basically when tighten the thru axle, the XDR hub i guess is too tightly pressed against the drop out, so that it is not free enough to pedal backwards.
As to what happens, basically when tighten the thru axle, the XDR hub i guess is too tightly pressed against the drop out, so that it is not free enough to pedal backwards.
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01-16-21, 01:44 PM
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why do you need to pedal backwards, did you miss your exit or something?
01-16-21, 08:19 PM
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This happened to me. The inner spacer on the hub behind the cassette on the trainer was worn down a bit, so the cassette wasn't turning well while pedalling stopped. I'd get the chain slacking while stopped and while pedalling backwards. I had to get a new spacer and the problem stopped.
01-16-21, 08:41 PM
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Have you contacted the trainer manufacturers support?
01-17-21, 07:53 PM
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I think i fixed it. I just have to tighten the force AXS cassette a lot more than i expected so that it's more "pushed in" so that it's not rubbing the drop out when i tighten the wheel with the thru axle. Thanks everyone!
