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No progress on this but I got a slightly unexpected donation from someone at work - a very old busted Lightweight disc! Only good as a wall hanger at the moment as it's been run over a kerb and one section of it sounds decidedly crispy.
Good to finally get a look at one of these. I was expecting it to be a solid foam core, but it's actually a pair of skins with carbon stringers on both sides of them. Tried to get some pics inside the wheel down the cutout and through the valve hole. It's a lenticular shape (edit: conical actually, I put a straight edge on it to check) and it has more carbon stringers on the flatter drive side than it has on the NDS. It's remarkably shonky in construction, but I guess still better than anything else you could get on the bike market back then.
Not entirely sure what to do with it yet. It's tempting to tidy up the dings and take a couple of moulds off it. But it's also tempting to strip it back a bit and repair it.
@pdlouche I still want to buy that wheel back!
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Well this thread is great
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Bumping this because my HED wheel split open and I've got a new project which might need it.
Thought this was last summer, but the image date says it was August 2022. Anyway, was riding along and the bike started wandering around a bit, a bit like when a frame tube is cracking. I wobbled the steering a bit and heard a cracking sound from the back and the wandering got worse. When I pulled over, I noticed with my weight on the bike there was a gap between one of the skins and the rim! Luckily I was right by work and I had a spare wheel there.
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Shortly afterwards, I ran a tool round the rim and popped the skin completely off. So this is what they look like inside.
The skin is held on with a flexible adhesive like silicone mastic. I've marked it up carefully so I can get it back on in the same place. I'll clean off the old adhesive and lightly grind it back, then bond it back on with some aerospace structural adhesive. Should live to see another day.
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As you seem to know about these things, I have the Tune Kom Vorr saddle where the rails have come away from the shell in one area. Could you direct me towards the right adhesive to be using? Two part epoxy just cracked again right away.
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You need a toughened structural adhesive with a high shear strength. Ideally you want to be able to get the rails all the way out and clean out any old adhesive first.
3M DP420 or if you want a longer workable time before it sets DP460
I was going to say Scotch Weld 9323 but it's dead expensive. Those two have a shear strength fairly close to 9323 so I'd give either of them a go.
420: https://www.3m.co.uk/3M/en_GB/p/d/b40066431/
460: https://www.3m.co.uk/3M/en_GB/p/d/b40066439/
9323: https://www.3m.co.uk/3M/en_GB/p/d/b40066445/You might find some cheap on eBay which is close to or slightly over its use by date. It'll still be fine.
pdlouche
konastab01
PhilDAS
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Gonna make a pimpin carbon disc wheel from scratch
Posted by
@Jonny69
I managed to make up a foam core before I left but didn’t get time to bond it up. The skins and core are up in the loft at the moment. I think I left the other hub at Red Bull because I can’t find it. I’ve been pestering @pdlouche periodically to sell me back that broken randomly back-to-front 4-spoke I sold him, maybe to pinch the fixed hub.