Not enough b screw adjustment

Rowan404

Hi, I've been having problems with my derailleur cage hitting the largest sprocket when shifting. My b screw is tightened to the max and it isn't enough. My hanger and all the other stuff seems to be on right. Should I get a longer b screw, do I need a longer caged derailleur or should I just trash my bike and get a new one? Thanks

cooldad

Yes.

cooldad

Or add in some detail, like mech model and cassette size.

PhilipPirrip

You can extend the range of the B screw by taking out the current screw and installing an allen head bolt in the other way round.

If the cage is already hitting the largest sprocket it sounds like you're using it beyond its working range and changing the B screw will be of little use so maybe a derailleur extender would be a better option.

Rowan404

PhilipPirrip wrote:

You can extend the range of the B screw by taking out the current screw and installing an allen head bolt in the other way round.

If the cage is already hitting the largest sprocket it sounds like you're using it beyond its working range and changing the B screw will be of little use so maybe a derailleur extender would be a better option.

Thanks for the tip, I'll try that when I get home. I'm guessing the problem is caused by the use of an 11-42 cassette with a derailleur that only had a 36 originally. I'm might be selling the bike today so I don't really have time for anything other than a quick fix.

JBA

Rowan404 wrote:

I'm guessing the problem is caused by the use of an 11-42 cassette with a derailleur that only had a 36 originally.

That is the crucial detail that was missing from your original post. You either need to get a longer b-screw and possibly a goat link or, if you are selling the bike just stick an 11-36 cassette on it.