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Can I convert my 7 speed 105 hub to a 9 speed?(4 posts)

Can I convert my 7 speed 105 hub to a 9 speed?teacherguy
Mar 22, 2002 11:20 AM
I want to up grade my bike with ultegra or maybe dura-ace shifters and rear derailer I have a 7 speed 105 hub and an 8 speed hub not bad but not as good as the 105. Can I replace the part that holds the 7 speed cassette(I think its called a cassette body) with one that holds the 9 speed cassette? Thanx
Mar 22, 2002 11:28 AM
It might work (I don't know if the large, hollow hex bolt is the same between the two), but remember there was a locknut spacing change to 130 mm and a re-dishing of the wheel going to 8-speed (9-speed was unchanged from 8-speed). That may present more of a challenge than the cassette body swapping.
Mar 22, 2002 11:58 AM
You may need a longer axle.

It also comes down the mfr. and design of the compnents that you want to swap (free hub bodies) if it's all Shimano then it might work, but remember when Shimano moves forward they don't spend a lot of time thinking about making things backwards compatible. It's typical to have things like this almost work.

I think you'll be money ahead (and fewer headaches) if you just get a new 8/9 speed hub - it's even cheaper if you buy a quality pre-built wheel.
ProbablySpoke Wrench
Mar 24, 2002 5:55 AM
The first thing to do is to measure the distance between the dropouts on your BIKE. If that's 130mm you're still in the hunt.

Take the axles out of both hubs. It's easiest if you remove the locknut and cone from the LEFT side and leave the right side components in place. The bearings for the right side are actually contained within the freehub body. Now use a 10mm allen wrench to remove the hollow allen bolt that holds the freehub body in place. It might take a bit of force. Once the bolt is out, the freehub will come off. It might take a little force too.

To reassemble, put the 8/9 speed freehub body onto the 7 speed hub. Easiest way is to use the axle set from the 8/9 speed hub, but you can also use the cones from the 7 speed as long as you change out the spacers. Last step is to redish the spokes to center the rim with the wider freehub body.

Make sure you end up with adequate tension on the left side spokes. Believe it or not, that's the Achilles heel of this conversion.