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PostPosted: Sun Jul 26, 2020 12:18 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Thu Jan 07, 2010 12:23 pm
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Location: Cumbria
Would anyone be able to help please. I’ve just picked up a Giant TCR bike that has been lifted out with time trial bits. It came with a HED Disc Wheel. Would anyone know what model this is and if an 11sp freehub is available?

Thanks in advance.


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PostPosted: Mon Jul 27, 2020 1:45 pm 
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That's the second generation HED disc which has a freehub. Earlier ones had freewheel threadings and didn't have 'Disc' across the HED logo. Mid to late 90s.

That freehub is a Shimano Uniglide one, given away by the threads on the outside of the freehub body. It's difficult to see, but it looks like it might have internal threads as well, so it might be the crossover freehub which took both the earlier Uniglide cassettes and the current Hyperglide ones. If it has one narrow spline, then it'll take both. If all the splinbes are the same width, it'll only take older Uniglide cassettes where the bottom cog is the lock ring. Either way, I think it's only wide enough to take 7 gears. You'll have to measure the length of the splines to be sure and compare to 7- and 8/9/10-speed freehubs/cassettes.

You might be able to convert it to an 11-speed freehub but it'll need a bit of checking and faffing and mix and match. Take the axle and bearings out and remove the freehub body with a large allen key. See what fitment is on the back of the freehub. Then see if you can find an 11-speed hub with the same freehub fitment and ideally the same bearings setup. Basically use the axle and freehub off the new hub. You will need to put a spacer on the non-drive side to re-centre the wheel because the 11-speed is wider than what's currently on there, so you might end up with 135mm OLD at the end to get the wheel back in the middle.


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 Post subject: Re:
PostPosted: Mon Jul 27, 2020 1:49 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Thu Jan 07, 2010 12:23 pm
Posts: 3717
Location: Cumbria
Fantastic, thank you for that reply. I’ll strip the hub down and see what I have. Fingers crossed I’ll be able to fit a more modern Shimano freehub and then be able to fit an 11sp cassette.


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 Post subject: Re:
PostPosted: Mon Jul 27, 2020 6:49 pm 
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Location: Bodmin,Cornwall.
I am 99% sure that all 11spd Shimano freehub bodys have a different engagement pattern to 10spd ones.


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PostPosted: Tue Jul 28, 2020 12:16 pm 
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^ Yes, I fear that might be the case.

I dug out my 5/6/7-speed freehub. See pics. The spline length is 30mm and overall length of the body is 35-36mm. I can't tell 100% from the angle of the pictures but EoB yours does look longer so it might be an 8/9/10-speed version.

I heard that there are some 11-speed cassettes you can use on a 10-speed freehub. I had a quick look and it seems to be the Ultegra and 105 11-34 cassettes (i.e. the big ones) that will fit, but not the smaller ones. The reason seems to be that the big cog is dished back towards the wheel. This should work, but check how close the derailleur is to the wheel surface when it's on the closest cog. If it touches, it'll tear the surface of the wheel.


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 Post subject: Re:
PostPosted: Tue Jul 28, 2020 12:58 pm 
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Location: Bodmin,Cornwall.
Edco make an 11spd cassette that fits a 10spd body. You can also use an 11 Shimano with 1.8 mm machined off the alloy at the rear. Obviously checking the mech doesn’t rub the carbon.


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