Sram Rival B screw washer

[Phrilly]

Hi,
Can anyone confirm whether I have the B screw washer in the right place on this picture . It's not possible with the current set up to get the distance between the jockey wheel and the outer cog to anything closer than 15mm and I was thinking maybe I have attached this incorrectly. The B screw washer will rotate freely anti-clockwise, only the B screw forces to retain in place.
Thanks in advance
Phil

[PT1029]

Sorry, can't see the photo.

[rjb]

Have a read of this thread and try to post your photo again.
viewtopic.php?t=160383

[Phrilly]

picture sorted now!

[Phrilly]

Sorry, can't see the photo.

Thank you that's fixed now!

[Phrilly]

Have a read of this thread and try to post your photo again.
viewtopic.php?t=160383

Thanks for your help!

[rjb]

Looks like that B screw needs to be screwed in a lot further to butt against the protrusion. For Shimano mechs the B screw is usually set so when back pedalling in bottom gear (biggest sprocket) the jockey wheel just clears the sprocket.
I would expect SRAM mechs to work on the same principle.

[Cyclothesist]

Sram recommend a 6mm clearance between the teeth of the largest cassette sprocket and the top jockey wheel.
https://m.youtube.com/watch?v=38vdA5OOB ... p=2AENkAIB

[Phrilly]

Yes I agree I would have thought it needed screwing in, but if I do the gap between the jockey wheel and the large cog gets even bigger. This is what makes me think the b washer is on wrong. Any thoughts?
Thanks again
Phil

[531colin]

I’m nowhere near a bike; but the tab is against the mech hanger stop and the B screw is against its stop.
Unless there’s a wrong part ( hanger or washer) I can’t see what else you can do.

[cycleruk]

What size cassette are you using ?

[Phrilly]

It's the 10 speed cassette (12/25) that it came with.

[Cyclothesist]

It's an MTB derailleur designed for up to 36T with a large cage or 34T with a medium. Maybe the issue is that a 25T cassette is a bit on the small side for that derailleur.
If it shifts ok then I wouldn't worry and you can fit a bigger cassette in the future.

[Cyclothesist]

A quick calculation suggests that a 34T sprocket will be ~18mm closer to the upper jockey wheel than the current 25T. That fits nicely with SRAM's guidance on setting the b-screw, you'd need to screw it in somewhat to clear that cassette.

[rjb]

If your bolt is too short and you don't have a longer one available cut a slot in the bottom and insert it from the other side. This gives you an extra 5 mm from the bolt head and the slot enables you to adjust it with a screwdriver.