I want to upgrade the mech and shifter to the "new" T-type AXS GX rear mech and shifter (my bike is compatible with the mech mounting). I can only find "upgrade kits" for the "old" AXS GX mech/shifter/battery/charger.
I can find complete group sets for the T-type stuff, but I don't need the cassette, chain or cranks. I only want the mech, shifter, battery, charger.
Or do SRAM want you to change the whole drive chain for T-Type?
i thought part of it was the flat top chain which required the cassette and possibly chainring?
half of the t type thing is the way it shifts?
You do need the cassette and the chain. You'll probably need a new chainring as well because the chain roller diameter is larger on flat top chain systems.
What @Onzadog said. They've changed everything, so you have to buy everything.
Upgrade kit here - will also need a shifter if you don't already have AXS
https://r2-bike.com/SRAM-GX-Eagle-Transmission-Upgrade-Kit_1
Ive seen various videos on youtube etc of people using a T type mech with a regular (non T type) 12 speed cassette and chain, people say they work with both shimano and sram cassettes and chains- despite what sram say about compatibility - Have a google around - I obviously havent tried this myself so dont take my word for it.
My plan is to just buy the T type derailluer on its own (no battery,or shifter), then use my current axs battery and shifter with it on my existing setup.
I have an unridden full GX AXS set up I am about to take off a new bike if any interest?
Note no battery in that upgrade kit so need to factor that in.
What @Onzadog said. They’ve changed everything, so you have to buy everything.
No you don’t.
If you have an existing setup, you can literally just swap the mech (assuming you have a UDH).
I’ve used mine with a new T-Type cassette, previous 10-52 X01 cassette & even a Shimano XT, on different wheelsets. It shifts fine on all of them.
The cranksets & chainrings are backwards compatible, but weirdly the flat top chains are not backwards compatible with previous Eagle chainrings.
So you can pretty much muddle it through however you like.
Well, every day is a school day. I took SRAM at their word due to the increased roller size.
I’ve used mine with a new T-Type cassette, previous 10-52 X01 cassette & even a Shimano XT, on different wheelsets. It shifts fine on all of them.
That's interesting.
I've got a previous Eagle 10-52 X01 cassette which is a fair chunk lighter than the GX T-Type one I'm currently running. I'll have to give the old one a try.
Just to update this thread, I just upgraded my old (non t type) axs derailluer to the new t type one, but kept all the other old parts, ie
- old style (none flattop) gx eagle chain
- Garbaruk Microspline 12 speed cassette
- generic narrow wide chain ring
- Original GX AXS shifter
- Original GX axs battery
and it all appears to work nicely together - you just need to use the microadjust to position the derailluer inwards in relation to the cassette
I thought you had to have the cassette becuase it’s got the transponder in it that tells the mech it’s time to shift as the ramps are in the right place. I guess if you don’t have that transponder it just shifts whenever which I thought kind of negates the point.
I thought you had to have the cassette becuase it’s got the transponder in it that tells the mech it’s time to shift as the ramps are in the right place. I guess if you don’t have that transponder it just shifts whenever which I thought kind of negates the point.
no idea, I dont think theres anything special like a transponder, in the official t type cassette apart from shaped teeth etc, nothing I can find any mention of anyway.
With this setup above it certainly doesnt shift as soon as you hit the button, there is a delay, but the shifts are smooth as you would expect.
I'll probably go for the official cassette when this one is worn out, but it seemed kind of wasteful to dump a perfectly functional (and not cheap) cassette
Transponder inside the cassette??
Not aware of this and can't find any reference to it in SRAM Transmission support pages? All can find on the SRAM site is "Cassette Mapping provides precise shift points while X-Sync tooth profiles maximize chain engagement"
It's a question I've yet to find the answer to. Apparently the mech "waits" for the correct position on the cassette so the shifts might be slower, but they are always connected to both cogs for full power shifting.
What hasn't been explained is how the mech knows where the cassette is.
thread about it here
https://www.mtbr.com/threads/eagle-transmission-cassette-mapping-high-tech-or-hype.1222528/
The consensus seems to be that its just specially profiled teeth on the cassette , coupled with maybe some sensing of resistance by the motor in the mech, but who knows really
Too much marketing bullshit. Sram are the kings of this. Yes, that’s my jealousy showing.
What does it actually mean?
Shimano HG+ type pick up ramps on the cassette.
A rear mech which know which cogs the chain is switching from/to (and so how long the shift should take).
No magic.