Changing free hub?
04-05-24, 12:40 PM
#1
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Changing free hub?
Hey, y'all. I am pretty handy but I've never changed a free hub. I'm looking at a used set of carbon clinchers for a pretty good price but they're listed as Shimano/SRAM 12 speed hub. The bike I intend to use this on is a Shimano 10 speed cassette. How big a deal is it to swap out the hubs? Can I even put a 10 speed hub on a 12 speed axle? Best source for a replacement hub?
04-05-24, 01:04 PM
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Hey, y'all. I am pretty handy but I've never changed a free hub. I'm looking at a used set of carbon clinchers for a pretty good price but they're listed as Shimano/SRAM 12 speed hub. The bike I intend to use this on is a Shimano 10 speed cassette. How big a deal is it to swap out the hubs? Can I even put a 10 speed hub on a 12 speed axle? Best source for a replacement hub?
04-05-24, 03:09 PM
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You should be able to just put your 10 speed cassette on this freehub. Might need a spacer. And check that it’s the correct axle type and spacing for your bike.
04-05-24, 04:14 PM
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04-05-24, 04:26 PM
#6
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Hey, y'all. I am pretty handy but I've never changed a free hub. I'm looking at a used set of carbon clinchers for a pretty good price but they're listed as Shimano/SRAM 12 speed hub. The bike I intend to use this on is a Shimano 10 speed cassette. How big a deal is it to swap out the hubs? Can I even put a 10 speed hub on a 12 speed axle? Best source for a replacement hub?
Likely it is a Hyperglide style with the 11 speed length, which is compatible with 12 speed Shimano made cassettes. HG 10 speed fits, with spacers, 1.85mm and possibly an additional 1mm spacer.
SRAM also has a few HG spline cassettes for 12 speed, but with MTB gear ratios. SRAM's 12 speed road is usually XDR body which is different.
If the freehub body is one of the other styles, then you need to get the exact hub/wheelset maker or model #. Freehubs generally not universal, so available only from the original producer.
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04-05-24, 04:35 PM
#7
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I have a request into the seller for a picture of the hub. The pictures listed in the sale ad shows it still factory wrapped. I have the wrenches and have changed Shimano cassettes several times, so I'm good there. But I haven't gotten into a free hub yet.
04-05-24, 04:52 PM
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If it’s advertised as Shimano/Sram 12 speed, it’s almost certainly a standard HG freehub. The other types are either Shimano or Sram specific.
04-05-24, 07:33 PM
#9
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Just heard back from the seller. Definitely dissimilar to the standard hub. I've seen this before but never used one. It's got splines like a conventional hub for the first cm or two, but then it has some threads, and finally a smooth finish.
04-05-24, 07:48 PM
#10
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Depending on the hub manufacturer, there may be a HG spline type available. You'll need to ID the hub/wheelset and research.
04-05-24, 07:55 PM
#11
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Yes. Doing a little more research it does appear to be the Sram XDR. The wheels I'm looking at are Ursus Miura C37. The price is pretty good, but only if I can make these compatible for under $100. Of course, I don't know if it's a thing, but I have no problem buying a dedicated cassette for this hub if I can find one that fits the range I have in mind.
04-05-24, 08:48 PM
#12
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Yes, you'll need to research the feasibility of replacing the freehub body. The interface of the XDR cassette/freehub body is a 'standard', but how the body attaches to the hub could vary.
Don't know of anyone who does 10 speed spaced cassettes for XDR.
Don't know of anyone who does 10 speed spaced cassettes for XDR.
04-05-24, 11:35 PM
#13
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There are so many different freehub to hub and cog interfaces and designs now, you really need to get exact info before buying parts. Even on common hyperglide freehubs, I think some have the big 10mm allen hollow bolt tightened from the non-drive-side, and some from the drive-side, and I can't recall if right or left hand thread. When I had to swap a freehub decades ago, I didn't have a torque wrench nor allen-socket to fit a wrench, so I just poked the wrench long end in from the non-drive-side, and used a pipe on the short end for leverage, loosened, installed new freehub, and to tighten I then converted the metric torque spec to english and applied appropriate pounds of force at measured leverage distance.
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04-06-24, 07:26 AM
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Looks like Ursus offers different cassette body options with their wheels. Probably best to contact them for availability and price. URSUS ROAD WHEELS – Ursus Cycling USA
04-06-24, 08:17 AM
#16
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I am holding off on this wheel set until I get a little more info. It feels like it may end up being a little more expensive than I thought.
