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Upgrading RX100 rear cassette hub to 8-9-10 speed

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Upgrading RX100 rear cassette hub to 8-9-10 speed

Old 05-23-10, 08:33 PM
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Upgrading RX100 rear cassette hub to 8-9-10 speed

I've got a set of decent wheels off of an older Cannondale with Shimano RX100 cassette hubs. The rear cassette is 7 speed, the hubs outer locknut width is 130mm, and there's enough space on the outer side of the freehub body to take the additional width; I tried an 8s cassette on it, and it (the cassette body) wasn't wide enough. Is there an 8-9-10 speed freehub body that will work with the RX100 hubset, and where can I buy one or what is the Shimano part number?

Thanks,

Pete
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Old 05-23-10, 08:51 PM
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Originally Posted by mudboy
I've got a set of decent wheels off of an older Cannondale with Shimano RX100 cassette hubs. The rear cassette is 7 speed, the hubs outer locknut width is 130mm, and there's enough space on the outer side of the freehub body to take the additional width; I tried an 8s cassette on it, and it (the cassette body) wasn't wide enough. Is there an 8-9-10 speed freehub body that will work with the RX100 hubset, and where can I buy one or what is the Shimano part number?
In general, all Shimano cassette bodies are interchangable. I've found small incompatibilities putting "road" bodies on "mountain" shells, but this won't be an issue for you. This one:
https://harriscyclery.net/product/tia...w2011-qc49.htm
should work fine.
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Old 05-23-10, 08:52 PM
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Any Shimano 8/9/10-speed freehub body will fit and replace your 7-speed body. These bodies are available as replacement parts but are quite pricey as component parts. The only mis-match may be the dustcover and any seals on your current axle may not match the newer freehub. Sometimes it's even cheaper to buy a complete new hub and recover the freehub body than it is to buy the body alone.

One possibility is to haunt various bike shops and try to get a trashed 8/9/10-speed rear wheel and salvage the freehub body and matching cones/seals.
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Old 05-24-10, 05:14 AM
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Thanks...so I won't run into any issues with bearing races of different types or anytyhing like that? It's been over a decade since my last stint as a shop mechanic and frankly I have no idea what the innards of a new(er) Shimano hub look like anymore...

Pete
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Old 05-24-10, 08:31 AM
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Originally Posted by mudboy
Thanks...so I won't run into any issues with bearing races of different types or anytyhing like that? It's been over a decade since my last stint as a shop mechanic and frankly I have no idea what the innards of a new(er) Shimano hub look like anymore...
Pete
No, there will be no incompatibility with the bearings. All Shimano rear hubs use 9 x 1/4" loose balls per side and, AFAIK, always have.
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Old 05-24-10, 08:35 PM
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I would reccomend that you find an older freehub body for a 105 or Ultegra hub. Not all of the shimano bodies are the same.
https://www.loosescrews.com/index.cgi...d=115120313722
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Old 05-25-10, 12:44 AM
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My Cannondal R600 comes with RX100 hubs. Currently has an 8-speed SRAM PG850 12-26T cassette on the rear wheel. Make sure the index rear shifter can handle the additional spockets.
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