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two ISO disc mounts, but that's quite a niche.
There are some 110×20 hubs with disc mounts both sides, but they are too close together to work in a 142mm frame, even with 5mm shims both sides. Double IS 6-bolt and 24h straight pull is a match made in heaven for a designer, but there isn't even the market to support it in track frames, never mind any of the 8000 "standard" freewheel hub widths.
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There's a 135 mm option from Mack.
https://mackhubs.com/hubs/track/high-flange-rear-iso/
Disc mount on both sides, maybe he'll make some custom end caps to make it compatible with the 142 mm spacing you need.Edit: Forgot about this one:
https://www.effigear.com/en/119-moyeu-arriere-roue-libre-14812.html
Don't know if that's really a thing or not though...
Think they've pushed out the delivery date since the last time I visited the website.
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gbj_tester
wenzovic
@Jon.
Could work. Would quite like to use both brakes. Ideally it would be 12 x 142 and have two ISO disc mounts, but that's quite a niche.