Re-adjust derailleur after replacing wheel?
08-03-11, 09:32 PM
#1
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Re-adjust derailleur after replacing wheel?
I know that sounds a little cooky, but I once took off my wheel and put it back on again and found later my derailleur needed to be adjusted. But, it was a new bike and I think it may be more because the cables were now stretched. I'm just curious though, if you look at the grooves on the side of the cogs on a Shimano freewheel, do they have to be perfectly aligned every time you re-install the wheel?
08-03-11, 09:52 PM
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There shouldn't be any reason to adjust the RD when replacing the same wheel. The location of the sprockets (either freewheel or cassette) is predetermined by the offset from the face of the axle nut to the first sprocket. Since the axle face is hard against the dropout the position of the sprockets relative to the frame and RD is always the same.
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08-04-11, 08:13 AM
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There shouldn't be any reason to adjust the RD when replacing the same wheel. The location of the sprockets (either freewheel or cassette) is predetermined by the offset from the face of the axle nut to the first sprocket. Since the axle face is hard against the dropout the position of the sprockets relative to the frame and RD is always the same.
If you replace your rear wheel with a different rear wheel, then it is common to need to adjust the derailleur a bit to compensate for slight differences between hub manufacturers.
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08-04-11, 09:04 AM
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When replacing a wheel it is important to reposition the axle in it's properly. With modern bikes with vertical dropouts the bike needs to be upright on the ground with its full weight on the wheel before closing the quick release or tightening the axle nuts.
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