Is it impossible to bend the SRAM UDH?

gilgamesh0 · Oct 19, 2022

gilgamesh0 said:
Their UDH violates the UDH license then, doesn't it? I thought the whole point of the license terms was that you can vary some details, but it has to be replaceable by another UDH.

Or I guess maybe that's a judgment call here if you just can't reuse the same bolt. (Didn't read carefully enough the first time.)

sm1512055 · Dec 19, 2022

BrapperBrad said:
Since the SRAM UDH is plastic (at least the hanger part is) is it impossible to bend it? My assumption is no, the plastic would just break, but I’m no polymer scientist and I hate assumptions.

If that’s the case, is derailleur hanger alignment now a step we can remove from our drivetrain trouble shooting? Assuming the bike has a UDH of course.

its possible to get an old 8mm socket and weld 2 pieces of metal to the socket part that will stick out of the udh and make sure its short and wide which will cover the very brittle sram udh and if its a socket its quick release obviously 👏

Tallboy723 · Dec 20, 2022

Ok so I’ve seen the sram UDH but steered clear of it. No idea how universal it is. Lol. Will it fit a TBv4? Cool premise tho.

wschruba · Dec 20, 2022

Tallboy723 said:
Ok so I’ve seen the sram UDH but steered clear of it. No idea how universal it is. Lol. Will it fit a TBv4? Cool premise tho.

The bike needs to be specified with one, you can't just put it on any bike. The name is 99% marketing, 1% open standard.

WR304 · Dec 20, 2022

Tallboy723 said:
Ok so I’ve seen the sram UDH but steered clear of it. No idea how universal it is. Lol. Will it fit a TBv4? Cool premise tho.

For Santa Cruz the best way to find what derailleur hanger fits your frame is by looking up the bike on their online spare parts list:

Shop All Parts & Tools

Santa Cruz Bicycles is dedicated to making the world's best mountain bikes. From the World Championship-winning V10 to the beloved Tallboy, we make bikes for people who live to ride.

shop.santacruzbicycles.com

An older Santa Cruz Tallboy 4 doesn’t use a SRAM UDH so it would require one of the specific Santa Cruz derailleur hangers for that frame. On that page the Santa Cruz short hanger would be the one used with most rear derailleurs whilst the long hanger is for a direct mount Shimano rear derailleur only.

The current Santa Cruz Tallboy 5 looks like it uses a SRAM UDH. Santa Cruz make their own version of it, probably all metal construction:

SANTA CRUZ UDH COMPATIBLE HANGER
SKU: 04-24715

Shop All Parts & Tools

Santa Cruz Bicycles is dedicated to making the world's best mountain bikes. From the World Championship-winning V10 to the beloved Tallboy, we make bikes for people who live to ride.

shop.santacruzbicycles.com

alexdi · Dec 27, 2022

To understand UDH, you really need to look at SRAM’s AXS prototype that’s been making the rounds. The RD is very low profile, much stronger (for lack of any hanger at all), and will retain the crash detection feature. The mount straddles the thru-axle, so the probability of frame damage is very low. Any benefit of a weak hanger is offset by degraded shifting.

larryniner · May 30, 2023

The plastic UDH hangers are garbage. The bolt is aluminum and the socket plastic, does not hold up to 25nm of torque, will strip or break, get a aluminum one, there never should have been a plastic option IMHO

alexbn921 · May 30, 2023

Norco reverses the threads to the hanger side and the outside bolt holds all the tension. It tends to work itself loose and fall out letting the wheel move freely.

Is it impossible to bend the SRAM UDH?

gilgamesh0

sm1512055

Tallboy723

wschruba

WR304

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