Mountain Biking - Help with freehub replacement

Hello everyone,

I am in the process of over hauling my old Yokota Yosemite Mt. bike. I have gotten everything apart and it appears that the freehub is not doing well. I know I can purchase a new wheel but I would rather just replace the freehub if I can do that.

The sprocket/cassette are Shimano HG - 7 sprockets/gears. The smallest sprocket/gear was loose with a spacer between it an the larger sprockets/gears (which are riveted together).

Below are some measurements I took of the freehub. I will label the measurement as the freehub mounts to the bike.

Total width = 35mm
Width where cassette sits = 31mm
Total diameter = 36mm
Diameter where cassette sits = 34mm

I have also attached some pictures.

From looking around I know this freehub is a Hyperglide because the threads for the sprocket lock nut is on the inside of the cylinder only (no threads on the outside). Also from what research I did this is NOT a 'Hyperglide-C' because the ridges which the sprockets catch on goes all the way to the end/edge of the freehub.

I thank you guys in advance for any help you can provide me with.

Ian Cooper

New wheel time.

How did you get the free-hub off? In any case, it's a standard Shimano free-hub, so basically any Shimano 7sp free-hub will work. I agree with Dannihilator, though. I would even just go ahead and upgrade to a 9sp set-up. There won't be much of a price difference at all in the wheel/cassette situation, your derailer should shift it just fine if it was 7sp(you could double check online), and shifters are cheap. IMO, 9sp is a big upgrade from 7. It's nice to be able to run an 11-32tooth cassette with no big gaps between cog sizes. I hardly even get out of my middle ring anymore except when I start getting tired.

Thank you for the information.....

When you are talking about upgrading to a 9spd - I assume you mean replacing (or adding 2 more) sprockets/gears? I assume to do this I need to get a different freehub?

I don't think I have the money at this point to upgrade to a 9spd. At this particular time in my life I just do not have much extra money. This is partially why I am hoping to just replace the freehub Vs. the whole wheel.

I have been looking around online and I keep coming up with this freehub as a possible replacement. Could someone advise if they think this one would work or not?

http://www.amazon.com/Shimano-STX-RC-Acera-X-7-Speed-Freehub/dp/B001GSKU0U/ref=sr_1_2?ie=UTF8&qid=1309376361&sr=8-2

My main concern is it looks like the 'ribs' that the sprockets catch on do not look like they go all the way to the edge (like the one I have). I fear this may cause my smallest sprocket to not fit?

Thanks,
Ian

How did you get the free-hub off?

Sorry forgot to answer this......

I have been purchasing tools as needed to disassemble the bike. I used a chain-whip and the special tool to remove the lock nut that holds the sprockets on. Once the sprockets are pulled off I used a 10mm hex-socket to remove the bolt that holds the free hub to the wheel.

Ian

The stx freehub body should work just fine. The ridges don't extend all the way to the end so that you can fit an 11 tooth cog on it, but anything (12, 13, 14 tooth etc) will fit.

Hey guys,

Just wanted to post on here with the final resolution to this thread.

On a suggestion by a friend of a friend I went to a different bike shop (one I had not so good experience with in the past). I was pleasently surprised that they had a freehub in stock for only $20. So from now on I will be going to this shop if I need anything else - guess that teaches me for 'ruling out' a shop based on a minor past experience.

Thank you guys for your help with this! The bike is back together and ready to ride again. I am very excited to get back on the trail after 3 years of not riding.

Ian

cool, glad you were lucky enough to locate a freehub body.