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Old 10-28-07, 07:49 AM   #1
BHBiker
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Adjusting the rear derailer with different clusters...

I have an altenate training wheel with a cluster of 12-25, my Race wheel is 11-23....now when I replace my rear wheel for training, the middle cluster speeds sometimes misfire....I would like to know how to adjust the rear derailer so that there would be smooth shifting for both wheel clusters 11-23 and 12-25. Thanks!
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Old 10-28-07, 09:37 AM   #2
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Tweak the RD barrel adjuster.
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Old 10-28-07, 09:51 AM   #3
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http://www.parktool.com/repair/readhowto.asp?id=64

Quote:
Originally Posted by capwater View Post
Tweak the RD barrel adjuster.
do the whole procedure from top to bottom until you're familiar with what changes you need to do when you swap out both wheelsets.
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Old 10-28-07, 10:05 AM   #4
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The ability of doing nothing when changing the wheels requires lining up of the cassettes on the two wheels. Since the shifting is currently just slightly off, after you change one wheel, you might try to make a washer, cutting a ring out of a soda can, and place it on one of the hubs under the corresponding cassette.

The above assumes that you have tools for cassette removal. If you don't you, might try to place a washer out of a soda can on the wheel axle, from the drive side. After convincing yourself that it works, place the washer between the nuts holding the hub, so that the thin washer does not get destroyed during the wheel change.

Last edited by 2_i; 10-28-07 at 10:12 AM.
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Old 10-28-07, 05:06 PM   #5
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Yeah, there are two measurements that I find are critical in setting up two wheels to be identical in shifting. Really handy when getting a mechanical in a race and you don't want to waste time making adjustments in the pits or on the bike. Nothing's more frustrating than watching your competition ride away from you as your gears are misfiring.

With one wheel on the bike, measure:

1. distance between inner drop-out face to smallest cog.
2. width of cluster, outside to outside

A basic caliper accurate to 0.1mm would be fine to determine these dimensions. Then adjust the spacers between the cogs and between the cogset and cassette-body to make both wheels the same. This often takes less time than fiddling with cable and RD adjustments and only needs to be done once.
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Old 10-28-07, 05:29 PM   #6
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These people make spacers to adjust cog position just for this problem.
http://www.wheelsmfg.com/products.ph...freehubspacers
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