SRAM Cassette Doesn't Work With Shimano Derailleur

7 replies · 118 views

mwandaw
7 posts
#1Apr 17, 2025, 9:51 PM
My bike has a Shimano GRX RX-810 rear derailleur and a Shimano 105, 11-speed, 11-34 cassette. They work great, but I'd like a wider gearing range.

I tried a Shimano 11-40 cassette, and the shifting was also great, but I had to screw in the B-limit screw to the point that it was hanging on the edge, and I don't want to use a Wolf Tooth to fix it.

So, I tried a SRAM PG-1170 11-36 cassette. I couldn't get the shifting to work right at all.

I thought that 11-speed Shimano and SRAM cassettes were compatible. What's going on?

Thanks!
0
Eric F
6 posts
#2Apr 18, 2025, 5:34 PM
My bike has a Shimano GRX RX-810 rear derailleur and a Shimano 105, 11-speed, 11-34 cassette. They work great, but I'd like a wider gearing range.

I tried a Shimano 11-40 cassette, and the shifting was also great, but I had to screw in the B-limit screw to the point that it was hanging on the edge, and I don't want to use a Wolf Tooth to fix it.

So, I tried a SRAM PG-1170 11-36 cassette. I couldn't get the shifting to work right at all.

I thought that 11-speed Shimano and SRAM cassettes were compatible. What's going on?

Thanks!

Hmmm...The SRAM cassette should work. It certainly has for me. I assume you've re-set the upper and lower limits and adjusted the cable tension properly with the SRAM cassette. If so, I'm out of answers without being able to put my hands on it myself.

Is the B-limit screw being at its limit your only reason for not using the 11-40 Shimano cassette?
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mwandaw
7 posts
#3Apr 19, 2025, 12:11 AM

Hmmm...The SRAM cassette should work. It certainly has for me. I assume you've re-set the upper and lower limits and adjusted the cable tension properly with the SRAM cassette. If so, I'm out of answers without being able to put my hands on it myself.

Is the B-limit screw being at its limit your only reason for not using the 11-40 Shimano cassette?
I'm confident the upper and lower limits are good. I say that because if I tighten the cable a little I can easily shift from the small sprocket to the big sprocket step by step without any trouble, but then I can't reliably shift from the big sprocket back to the small sprocket unless I loosen the cable. I have no trouble at all with the Shimano 11-34 cassette.

I gave up on the Shimano 11-40 cassette because the B-limit screw was beyond its limit. I don't want to use a Wolf Tooth because I have a second wheelset with road tires and an 11-28 cassette. I think the upper jockey wheel would be too far from that cassette if I had a Wolf Tooth.
0
Eric F
6 posts
#4Apr 21, 2025, 5:39 PM
I'm confident the upper and lower limits are good. I say that because if I tighten the cable a little I can easily shift from the small sprocket to the big sprocket step by step without any trouble, but then I can't reliably shift from the big sprocket back to the small sprocket unless I loosen the cable. I have no trouble at all with the Shimano 11-34 cassette.

I gave up on the Shimano 11-40 cassette because the B-limit screw was beyond its limit. I don't want to use a Wolf Tooth because I have a second wheelset with road tires and an 11-28 cassette. I think the upper jockey wheel would be too far from that cassette if I had a Wolf Tooth.

On my current 1x11 GRX setup, I'm running a 11-50 Garbaruk cassette with a GRX derailleur and Garbaruk extended cage. In order to get enough B-limit adjustment, I removed the screw and threaded it in from the other side (screw head towards the front of the bike). It works. No Wolf Tooth linkage required.

That said, it's not great. The Garbaruk cassette and derailleur setup is functional, but not perfect. It's a bit noisy on one end of the cassette or the other. I'm currently collecting parts to go 1x12 (44T x 11-51), all Shimano.
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Eric F
6 posts
#5Apr 22, 2025, 10:23 AM
I see you have found more responses at Bike Forums. This place simply doesn't have enough users to be effective for this kind of issue.
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Mark_S
144 posts
#6May 25, 2025, 6:51 AM
My bike has a Shimano GRX RX-810 rear derailleur and a Shimano 105, 11-speed, 11-34 cassette. They work great, but I'd like a wider gearing range.

I tried a Shimano 11-40 cassette, and the shifting was also great, but I had to screw in the B-limit screw to the point that it was hanging on the edge, and I don't want to use a Wolf Tooth to fix it.

So, I tried a SRAM PG-1170 11-36 cassette. I couldn't get the shifting to work right at all.

I thought that 11-speed Shimano and SRAM cassettes were compatible. What's going on?

Thanks!
Did you solve this? Sounds to me like you might not have installed a spacer behind the cassette?
0
mwandaw
7 posts
#7May 25, 2025, 10:57 AM
Did you solve this? Sounds to me like you might not have installed a spacer behind the cassette?
I have had to focus on other projects, so this is on the back burner for now. I really appreciate all of the suggestions!
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Mark_S
144 posts
#8May 27, 2025, 5:59 AM
When you get back to it, just research whether you need a 1.85mm spacer behind the cassette. If you do it's a quick fix and you won't even need to re-index. Good luck.
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