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Old 04-20-17, 08:49 PM   #1
jefnvk
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Shimano 7spd Freehub Replacement Options

I have a FH-M290, on an old Acera-X hub. It cracked, and needs replaced. What, if any, freehubs are compatible and a direct replacement with this? Needs to work with a 7spd HyperGlide cassette.

Cost is no longer an object, to a reasonable point (essentially, 50% of a new back wheel), I want this damn bike up and running ASAP!

Also, out of pure curiosity, are freehub rear wheels not dished?
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Old 04-20-17, 09:35 PM   #2
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Cheapest and quickest solution is a replacement wheel. Since most all will be 8+ speed spec a 4.3mm spacer behind the cassette will allow the 7 speed cassette to tighten up well. Other options might be finding a hub shell (old wheel as source) and transferring your old freehub body. But axle cones and spacers can be a challenge to get right.


Wheel dish is not determined by the cog attachment but the number of cogs/axle OLD dimension/chain line and a few other factors like non drive side stuff (disk brakes). For the typical rim braked road and mountain bike the rear wheel will have some dish. For others... Andy
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Old 04-20-17, 09:54 PM   #3
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Cheapest and quickest solution is a replacement wheel. Since most all will be 8+ speed spec a 4.3mm spacer behind the cassette will allow the 7 speed cassette to tighten up well.
I'd believe quicker, but is it really cheaper? Are 7 spd freehubs simply not available anymore?

If so, I probably should just go buy 8+ spd shifters and cassettes
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Old 04-20-17, 10:09 PM   #4
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I believe any Hyperglide 7 speed freehub body except Dura Ace is compatible with your hub.
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Old 04-21-17, 02:18 AM   #5
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I have at least one new LX 7spd hub you could steal the freehub from.
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Old 04-21-17, 05:33 AM   #6
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Like this? Shimano 7 Speed Freehub Body > Components > Wheel Parts > Freehub Bodies | Jenson USA
Freehub wheels are dished...
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Old 04-21-17, 06:12 AM   #7
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Another possibility is to try an older LBS to see if they have any damaged 7-speed wheels or the hub retrieved from a such a damaged wheel in their spares boxes. You may get it free or at nominal cost. Transfer the freehub body from the old hub to yours. That way you also get the driveside cones and seals that match the replacement freehub body.
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Old 04-21-17, 07:38 AM   #8
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Thanks! Question on the dishing was simply because the wheel looked pretty symmetrical once the freehub came off, at least compared to all my freewheel bikes.

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Originally Posted by Trevtassie View Post
Perfect. That was the one I was looking for, that Tree Fort, Niagara, etc. all listed as out of stock.

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Another possibility is to try an older LBS to see if they have any damaged 7-speed wheels or the hub retrieved from a such a damaged wheel in their spares boxes. You may get it free or at nominal cost. Transfer the freehub body from the old hub to yours. That way you also get the driveside cones and seals that match the replacement freehub body.
Yeah, I'm going to stop a few places that I think may have such a thing on the way home first. Ordering parts every step of the way when the next thing doesn't fit is getting annoying...
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Old 04-21-17, 08:11 AM   #9
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I'd believe quicker, but is it really cheaper? Are 7 spd freehubs simply not available anymore?

If so, I probably should just go buy 8+ spd shifters and cassettes

Cheaper because I value time and transportation. Also because you'll likely end up with bearings, rim and spokes which have their entire life still available (with a new wheel) as opposed to fixing the old wheel which has some of the above's life already used up.


But all this is a judgment that is somewhat dependent on your ability to find a freehub body which interchanges quickly. Andy.
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Old 04-21-17, 08:46 AM   #10
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Cheaper because I value time and transportation. Also because you'll likely end up with bearings, rim and spokes which have their entire life still available (with a new wheel) as opposed to fixing the old wheel which has some of the above's life already used up.
Fair enough! I get as much joy out of the building and tinkering as I do the riding, so my time value is a bit different, this is just starting to drag out more excessively than I ever imagined. The other reason I would prefer to stick with it is I would prefer to remain with a 36h wheel, not drop down to a 32h or 28h, which seem to be the standard these days.

The good news is this is the last issue to resolve, so I should have a much more reasonable two months with the new bike than my last touring build, which was finalized a good week before it was on a plane
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Old 04-21-17, 12:15 PM   #11
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Where are you touring? In one month I leave for Astoria and hope to ride past my house 2 months later. Just had my new touring bike out today. In a week it gets a final clean up. tuning then boxing for the FedEx shipping. Andy.
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Old 04-21-17, 12:37 PM   #12
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Iceland, 6 or so days through the interior, and a couple more around Reykjavik and (hopefully) Akureyri.

Astoria Oregon, I presume? Unless it takes you two months to get from NYC to Rochester I look forward to the day when I get more time than a week or two to do such things!
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Old 04-23-17, 10:13 PM   #13
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I got a 7 speed freehub from Aliexpress for cheap. Only drawback was the wait. It took about 2 weeks instead of two days from a US supplier.

-SP
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Old 04-24-17, 08:11 AM   #14
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Originally Posted by jefnvk View Post
I'd believe quicker, but is it really cheaper? Are 7 spd freehubs simply not available anymore?

If so, I probably should just go buy 8+ spd shifters and cassettes
Your 7 speed shifters and 7 speed HG cassette will work fine on an 8 sp wheel with a spacer.
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