Tag: SRAM Transmission

We’ve got a lot of questions on what bikes are compatible with the new T-Series SRAM Transmission Drivetrains.

So, Will SRAM Transmission Fit on My Bike?

It’s pretty easy to tell:

Does your bike have a UDH rear derailleur hanger and is it designed with a 55mm chainline?
(at this junction I havne’t seen a UDH bike, not 55mm – so basically – is your bike UDH?)

Here’s a quick look at the details that allow the SRAM Transmission to really stand out as the next generation in drivetrains, particularly with it’s automated setup.

SRAM UDH

So when you heard SRAM was making derailleur hangers what was your thought?

Until I heard chatter about the Transmission system I was kind of like, great, another standard eh?

But as the advancements of the new SRAM Transmission and T-Series components came out it made a lot more sense.

Above on the Left is the hub mating surface of the new Derailleur and on the right is the surface of the UDH.

This is really the piece that allows the SRAM Transmission to take its performance to the next level: Bikes designed with the UDH provide SRAM a dedicated measurement and contact point with the hub, and therefor with the cassette.

In this illustration you see how the SRAM Transmission Derailleur directly contacts the hub while also accepting the bike’s axle.

This is the importance of bikes being designed around the SRAM UDH in order for Transmission to function.

The 55mm Chainline

The latest in the ever evolving standards of MTB right? I know, part of me wants to make fun of it but the majority of me has a lot of appreciation that this sport values your dollars and continues to innovate – even if it means seemingly continual change! (I swear the next remade 1980s or early 90’s movie or TV commercial I see is gonna make me puke – at least in MTB its always doing something new…)

The wider chainline allows the Transmission system to work, provides a slightly stiffer and more robust rear triangle and requires specific cranks.

You can see the axle difference below between the SRAM GX DUB 52mm and 55mm DUB Wide cranks.

So – what if your bike doesn’t have a UDH? Well non-UDH boost bikes can run the previous SRAM AXS technology available in GX, X01 and XX1 configurations.

In fact, the SRAM AXS system will still mount on a UDH bike as well if you want very specific cranks, chains, etc outside of the T-Series range.

Quick Differences between Transmission and AXS

Transmission provides automated setup and tuning as well as notable improvements to component strength and longevity.

SRAM AXS has an automatic trim tool but does require a bit of setup prior.

If you’re building a new bike most riders shopping wireless shifting will gravitate the new Transmission series as it is more robust and has some interesting design upgrades such as replaceable bash plates as well as other considerations to minimize potential damage in an extreme scenario.

If you’re updating or upgrading your current bike it tends to depend on budget (you’ll need new cranks with specific chain rings with the Transmission system), how important auto-setup is and whether your bike is UDH or not.

Whether you choose Transmission or the previous AXS you’re getting the best in wireless shifting available in MTB or eMTB.

Questions on wireless shifting options? Give us a call, email or use the chat and we’ll get you the right parts for your project.

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