10th October 2018

Shimano XTR M9100 Rear Derailleur is compatible with SRAM Eagle 12 Speed!

Shimano XTR M9100 Rear Derailleur is compatible with SRAM Eagle 12 Speed!

SRAM Eagle 12 speed has been on the market for 2 years now and has changed the game with the range it offers on only a single front chain ring. Shimano have always seemed to be playing catch up to SRAM when it comes to 1x gearing and ever since eagle was launched fans of Shimano have been waiting for them to come out with their own wide range 12 speed transmission. It finally came this year with the launch of the Shimano XTR M9100 groupset

I've always felt that Shimano held the edge in terms of build quality over SRAM and have been a long time user of Shimano XT 10 and 11 speed groupsets. This year however when I was building my new Transition Sentinel I decided to give SRAM GX Eagle a try. For the most part the experience has been pretty good, the shifting is smooth and I have had no problems with the crankset, chain, cassette or gear shifter. The problem I have had though is with the top jockey wheel on the rear derailleur collapsing and damaging the inner cage. I have seen this happen to many other GX Eagle derailleurs on customers bikes and at races so it seems to be a common issue that has not yet been resolved by SRAM

When Shimano launched the new XTR to be media earlier in the summer I didn’t pay too much attention to it as I would usually intend to wait until the technology filters down to the more reasonably priced XT range. I was also put off by the fact that Shimano had opted for a new Micro Spline freehub design which would mean having the change my rear wheel in order to use the new 12 speed cassette

My last GX Eagle derailleur broke on the first day of a three day event which annoyed me some what to say the least and I opted to switch back to my XT 11 speed to make sure I got through the next two days without a problem and because I didn’t want to buy a new GX derailleur if it was just going to break again in a short period

The rest of my GX Eagle groupset was still in good condition though which is what led me to wondering if a Shimano XTR M9100 rear derailleur and shifter would work with a SRAM Eagle 12 speed 10-50 cassette. I couldn’t see any reason for it not to work so ordered them up and waited patiently for them to arrive

The shifter arrived a few weeks ago but the derailleur didn’t show up until this week. I could finally fit them to the bike and am happy to confirm that the setup works perfectly. I wasn’t surprised by this as I didn’t think Shimano would be able to alter the spacing of a 12 speed cassette so was pretty sure beforehand that it would work

Having fitted the Shimano XTR M9100 shifter and derailleur and confirming that it will work with a SRAM eagle 10-50 cassette I thought I would quickly try a SRAM GX eagle shifter with the Shimano XTR rear derailleur and see if they were compatible. I wasn’t really expecting this to work as previously SRAM and Shimano shifters have used a different pull ratio so they have not been interchangeable with each other.

To my surprise the SRAM GX Eagle shifter worked perfectly with the Shimano M9100 derailleur!

I think this is great news as if like me you are fed up with breaking your SRAM Eagle rear derailleur you have the option to fit a Shimano XTR M9100 derailleur instead without changing the rest of your drivetrain