To make wheel swaps even easier between my two disc bikes I am looking for a single cassette that works on both derailleurs.
one is 1x gravelbike with an rx812 rear derailler (Top sprocket: Max. 11T/Min. 11T Low sprocket: Max. 42T/Min. 40T according to shimano). The other is an 810 with a max 34 size. I know this works with 11-40 since shimano is quite conservative but I was hoping it also works the other way around.
11-34 should be plenty since it's only for road application in that setting on the 1x anyway.
Any experiences running an 11-34 on both? or just the 812?
GRX rx810 and rx812 with 11-34 cassette?
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Try it - there's a good chance it'll work.
FWIW, a few years ago I used a 12-23 10 speed road cassette with a Deore 9 speed MTB RD rated IIRC for 28T minimum. After I backed the B-tension right off everything was fine.
There were also no problems with an R8000 FD and RX800 RD with 42x27 rings and an 11-40 XT cassette; all the gears had acceptable chain tension.
IME you can usually get away with larger or smaller cassettes than Shimano say, within reason.
FWIW, a few years ago I used a 12-23 10 speed road cassette with a Deore 9 speed MTB RD rated IIRC for 28T minimum. After I backed the B-tension right off everything was fine.
There were also no problems with an R8000 FD and RX800 RD with 42x27 rings and an 11-40 XT cassette; all the gears had acceptable chain tension.
IME you can usually get away with larger or smaller cassettes than Shimano say, within reason.
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If it helps I use a 11-32 on a SRAM Apex 1 rear mech with no issues, just wound the b screw out.
SRAM don't seem to state a minimum cassette size unlike Shimano
SRAM don't seem to state a minimum cassette size unlike Shimano
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I have an Ultegra RD-RX800, which I believe is almost identical to the GRX810 RD. I have it set up with an 11-40 XT cassette and it runs great in 1x. It can also be adjusted down to accommodate 11-34 as well.
I did try it with an 11-42 cassette as well. It did not work. Got a vid up on YT trying out the 11-42. I'll post a follow up with the 11-40.
I did try it with an 11-42 cassette as well. It did not work. Got a vid up on YT trying out the 11-42. I'll post a follow up with the 11-40.
Wilier Cento10AIR - SRAM Force AXS - Road/race
3T Exploro - SRAM Rival AXS XPLR - Gravel
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3T Exploro - SRAM Rival AXS XPLR - Gravel
Wilier Sestiere - Shimano Tiagra - Commuter
YouTube link: https://www.youtube.com/@JMCyclingVideos
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