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Shimano Deore m5100 Derailleur: b screw-tension

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Shimano Deore m5100 Derailleur: b screw-tension

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flag ShawMac
O+ FL
Posted: Jul 14, 2022 at 11:25 Quote
Hey all,

I recently mounted up an M5100 11 speed derailleur which is designed to accommodate the 51 tooth cog. I am currently running the 11-46 cassette, and even with the b screw backed all the way out, the space between the jockey and cogs seems massive. I think it may be causing some lazy shifting, primarily when moving down the cassette to smaller cogs. I noticed that the Shimano website lists a "low sprocket_min" of 51T which I have not seen before, but perhaps this is why.

I am not feeling the need to run out and buy an 11-51T cassette right now. Anyone else run into this? If I install the derailleur "incorrectly" with the b screw contact tab flipped out of the way and let the b screw contact the tab on the drop out directly it gets considerably closer, but the screw makes contact at a really weird angle and barely on the edge I'd be worried about bending and/or weird wear.

Just live with it until its time to buy a new cassette? Anyone else running this derailleur on a smaller cassette than 11-51?
flag M0rd4c4i
Posted: Jul 15, 2022 at 7:00 Quote
I just had a look through the installation manual and there's no solution to setting the distance with the B screw with your cassette.
flag ShawMac
O+ FL
Posted: Jul 15, 2022 at 16:26 Quote
M0rd4c4i wrote:
I just had a look through the installation manual and there's no solution to setting the distance with the B screw with your cassette.

Thanks. That was my take as well, but just needed the bad news corroborated. Confused
flag jasonkatz
Posted: Jul 18, 2022 at 17:23 Quote
Curious if any adjustments would need to be made if going from the 11 speed 51-tooth casette to the 11-46 tooth? Is it an issue if only going larger?
flag ShawMac
O+ FL
Posted: Jul 18, 2022 at 18:26 Quote
This is the issue I am having. Out of adjustment range to go smaller. It will ride, the shifting is just lazy for a couple of gears.
flag M0rd4c4i
Posted: Jul 18, 2022 at 19:49 Quote
I think it's to do with the nature of it being a long cage derailiuer.

Sucks they don't offer a medium length option that would allow smaller T count on the lowest gear/largest sprocket.
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