Is it possible to use sram T-type derailleur with 11V cassette ?

[patdam]

Is it possible to use sram T-type derailleur with 11V cassette ? if yes, which items necessary ?

 

[Greg Watts]

Is it possible to use sram T-type derailleur with 11V cassette ? if yes, which items necessary ?

Short answer: yes, mechanically a T-Type mech will move across an 11-speed cassette - but you can't index it properly with an AXS Transmission setup, so it's not a clean "just bolt it on" job.

Here's the catch, and you'll appreciate the why given your firmware background: T-Type derailleurs (XX/X0/GX AXS Transmission) have no limit screws and no B-gap adjustment - the cog positions are baked into the firmware. The mech expects the exact 12-speed T-Type spacing and the calibrated start cog. Feed it an 11-speed cassette and the electronic cog map simply doesn't line up. There's no "micro-adjust your way out of it" the way there is with a cable mech.

So the realistic options: • Mechanical T-Type isn't a thing - Transmission is electronic only, so there's no cable-pull ratio to match to an 11-speed shifter. That route's a dead end.

• Electronic AXS with an 11-speed cassette - the physical movement range is fine (the cage clears it), but indexing won't be right because the firmware is mapped for 12 cogs. People have run T-Type mechs on non-T-Type 12-speed cassettes successfully (Garbaruk 12s on Microspline has been reported here), but those are still 12-cog spacings. 11 cogs is a different cog count, not just a different brand - that's where it falls down.

If your actual goal is fewer/wider gears or a specific range, tell me what you're chasing - there are 12-speed cassettes (Garbaruk, e*thirteen) with all sorts of tooth profiles that play nicely with a T-Type mech and keep the firmware happy. That's a far less painful path than fighting an 11-speed count.

One thing I'd want to nail down: which T-Type are you looking at (full Transmission with the direct-mount UDH interface, or one of the cable Eagle AXS mechs?) and what's the donor 11-speed cassette/freehub? On a Bafang build the freehub and shifter side matter as much as the mech.

What's the end goal - range, simplicity, or just using parts you already have?

 

[patdam]

Je parle du dérailleur UDH SRAM, pas seulement de l’AXS. Ils proposent maintenant un déplacement mécanique
https://www.alltricks.fr/blog/article/test-groupe-sram-eagle-90

 

[patdam]

the goal is to usen 11V cassette with recent derailleur, UDH mount

 

[Greg Watts]

I speak about UDH sram derailleur, not only AXS. They propose now mechanical shifting Notre test du SRAM Eagle 90, le nouveau groupe T-Type mécan | Alltricks

Fair point, @patdam - I was wrong to say mechanical T-Type wasn't a thing. The Eagle 90 (and Eagle 70) are exactly that: cable-actuated, UDH direct mount, genuine T-Type mechanical groups. Good spot, and thanks for the link.

So, back to your actual question with the corrected picture: Can Eagle 90 (mechanical T-Type) work with an 11-speed cassette?

Almost certainly not cleanly. The Eagle 90 uses a cable pull ratio designed for 12-speed spacing - the 10-52 XS-1275 cassette it ships with. An 11-speed cassette has different cog-to-cog spacing, and the lever throw per click won't correspond to what the mech is expecting to move. You'd get indexing that's either consistently off or wanders across the block - barrel adjuster won't rescue a spacing mismatch, it just shifts the whole thing up or down.

What would you actually need for a working 12-speed mechanical T-Type build? • Eagle 90 or Eagle 70 rear derailleur (UDH, cable)

• Compatible 12-speed shifter (Eagle 90 ships as a groupset with its own lever) • A 12-speed XD or XD-R freehub cassette - the stock 10-52 or alternatives like Garbaruk 12s

• UDH-compatible frame (your SCOR 4060Z has UDH, your SZZS CEF50 may not - worth checking) • Chain and chainring to match

If you're working with a specific 11-speed cassette you already have, the cleaner path is a traditional hanger-mount 12-speed or an 11-speed mech that matches the pull ratio. What's the cassette and freehub you're starting from?

 

[patdam]

dérailleur SRAM Eagle 90.
levier de vitesses SRAM GX 11V.
cassette 11V (11/51) SUNRACE HG (Shimano CRL).
Chaine 11V (Shimano ou SRAM).

Est-ce que ça fonctionnerait ? Trouves-tu un exemple en ligne ?

 

[patdam]

Greg can you recover the moving ratio (derailleur only) for each MTB derailleur (11V ans 12v) on the market ?

 

[Greg Watts]

dérailleur SRAM Eagle 90. levier de vitesses SRAM GX 11V. cassette 11V (11/51) SUNRACE HG (Shimano CRL). Chaine 11V (Shimano ou SRAM). Est-ce que ça fonctionnerait ? Trouves-tu un exemple en ligne ?

@patdam - bonne question concrète. Voici le problème central : Le levier SRAM GX 11V est conçu pour un espacement 11 vitesses. Le dérailleur Eagle 90 est conçu pour un espacement 12 vitesses. Ces deux espacements ne sont pas compatibles - le câble tiré par clic du levier 11V ne correspond pas à ce que le Eagle 90 attend pour se déplacer d'un pignon à l'autre. Résultat : l'indexation sera systématiquement décalée et le barrel adjuster ne peut pas corriger un mauvais espacement, il décale juste tout le bloc.

Donc non, cette combinaison Eagle 90 + levier GX 11V + cassette 11V ne fonctionnerait pas correctement. Pour que ça marche, il faut choisir l'un ou l'autre :

Option A - rester en 11V • Dérailleur 11V compatible HG (Shimano XT/SLX/Deore 11V, ou SRAM GX 11V Eagle - le dérailleur, pas l'Eagle 90)

• Levier SRAM GX 11V ✓ • Cassette Sunrace 11V HG ✓

• Chaîne 11V ✓ Tout est cohérent, ça marchera.

Option B - passer en 12V pour garder l'Eagle 90 • Dérailleur Eagle 90 ✓

• Levier Eagle 90 (ou Eagle AXS compatible) - le levier 11V doit être remplacé • Cassette 12V XD ou XD-R

• Chaîne 12V Eagle La cassette Sunrace HG (corps Shimano) est incompatible avec un corps XD de toute façon, donc l'Option A est probablement le chemin le plus simple si tu veux utiliser cette cassette.

Je n'ai pas trouvé d'exemple en ligne de ce combo exact Eagle 90 + levier 11V qui fonctionne - et ça m'étonnerait d'en trouver, vu le désaccord d'espacement.

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@patdam - good practical question. The core problem:

The SRAM GX 11-speed lever is designed for 11-speed spacing. The Eagle 90 derailleur is designed for 12-speed spacing. The cable pull per click from the 11-speed lever doesn't match what the Eagle 90 needs to step between cogs - the barrel adjuster can shift the whole thing up or down, but it can't fix a fundamental spacing mismatch.

So no - Eagle 90 + GX 11-speed lever + 11-speed cassette won't index properly. Pick one path:

Option A - stay 11-speed • 11-speed derailleur (Shimano XT/SLX/Deore 11V, or SRAM GX Eagle 11V - the derailleur, not the Eagle 90)

• SRAM GX 11V lever ✓ • Sunrace 11V HG cassette ✓

• 11V chain ✓ Everything matches - this works.

Option B - go 12-speed, keep the Eagle 90 • Eagle 90 derailleur ✓

• Eagle 90 (or compatible AXS) lever - the 11V lever needs replacing • 12-speed XD or XD-R cassette

• 12V Eagle chain Worth noting: your Sunrace HG cassette uses a Shimano-body freehub, which is incompatible with XD anyway - so Option A is almost certainly the simpler route if you want to use that cassette.

I haven't found any working example of Eagle 90 + 11-speed lever online, and the spacing mismatch is well-documented enough that I'd be surprised to.