Sour Not-Quite-UDH for steel bikes, more universal compatibility, Purple Haze with GX transmission Support us! Bikerumor may earn a small commission from affiliate links in this article. Learn More
UDH is the big bike buzzword these days – with SRAM’s latest direct-mount Transmission derailleurs requiring it – but Sour thinks they’ve found a better way to future-proof their steel bikes. Instead of fully adopting the universal hanger standard, Sour tweaked it a bit so they could still make a lightweight dropout well-suited for small-diameter steel tubes, but with T-type direct mount derailleur compatibility. And importantly for some adventure riders… Tailfin compatibility, too. Sour goes Almost-UDH for Transmission compatibility
(Photos/Sour) OK I know, I know…
We finally got a universal derailleur hanger standard that brands were whole-heartily adopting, and these steel bike builders decided to screw with it and make another standard!
What are they thinking?
Well…
What they are thinking is that UDH is really not quite as ‘universal’ as well all thought. And it was really optimized for the flat wide dropouts of carbon bikes. 2024 Sour Not-UDH almost universal derailleur hanger Transmission direct mount compatibility for steel bikes, inside detail It requires a 13mm thick dropout with a pretty big 30x40mm flat area on the inside and 25mm diameter flat spot on the outside. Transmission derailleurs simply require ~30mm in diameter flat on both sides. That’s pretty standard on carbon bikes. And alloy bikes with big machined dropouts can also easily make that work.But many quality steel and titanium bikes use […]
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