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@Rik_Van_Looy
Mild thread de-rail re: ISO-disc hubs bolt-on disc-coggery.
(Vaguely on-topic - used one on the Gitane).
Reason for de-rail is that replacement bearings arrived for Duratec rear wheel so I'll be stripping/rebuilding - more of that later.
Had a flurry of PM communications with Spotter a few weeks back when he was investigating all this, much of it was news to him so I'll reiterate it here & put it in the public domain.
The established ways of implementing bolt-on cog are....
A couple of years back when I built this wheel I didn't have cash for options 1&3 but wanted sealed cartridge bearings/moar sexiness than option 2....
I took the plunge and bought a 10mm DH hub on the basis that it can't be beyond the whit of man to get it working....
When I dismantled, I found it was pressed together - cartridge bearing OD pressed in housing, ID on plain aluminium axle.
On my axle (DaBomb) dust covers & "lock nuts" screwed onto coarse threads on axle enabling pre-load. These were locked in place with a grub screw - on hope hubs they tend to be pressed in place and locked on with grub screws.
The way I got DaBomb to work with M10 threaded rear axle was with some Surly "cones" donated on an old hub I got from Butters of this parish.
Surly "cones" are a pair of flanged sleeves of correct tolerance to give tight fit with the Inner Diameter of cartridge bearing. The official name is surly rear hub hardware kit
These sleeves are threaded so they screw onto an M10x1.0 mtb rear axle. The flanges push the inner race of bearings into hub housing to pre-load.
I've then used standard M10 x 1.0 axle/locknuts/spacers to prevent sleeves unscrewing or tightening and re-space hub from 100-120mm OLN.
This method enables you to convert any front MTB ISO hub that takes a "6001" cartridge bearing (12x28x8mm) - list of common bearing sizes here
The 6001 2rs (2RS means it's fitted with rubber seals) was a standard for XC and early DH/Suspension specific front ISO Hubs - e.g. Hope Mono Suspension and Hope XC Sport, Ringle, DMR, White Industries etc - stuff that came out before 20mm monster bolt-through front hubs.
One potential headache might be getting your mitts on the Surly kit - I've not tried procuring one, so I don't know how easy it'd be - anyone working a bike shop able to confirm whether it's something held by UK distributors??
If this proves a pain, I've also developed a DIY approach - cutting the 2 relevant sections from the original axle and tapping an M10x1.0 thread - more hassle but at least there's a guarantee of a quick outcome.
The replacement bearings I chose are 6001 2RS by Koyo, bought from simplybearings. The ones that came out are cheap crap sold with the hubs - with a bit of luck the Koyo will last a few more miles!!!
The bearings were stuffed after 2 crappy winters, 18mths ~ 8000miles
Piss poor if you ask me (that said, till I moved house in the summer the Duratec and its predecessor Harry O lived outdoors...)