does the b-adjustment look right to you on this picture?

anoble66

As the title, does the b-adjustment look good to you? Bike was in the LBS last week and the adjustment screw was screwed all the way in, to the point where the screw was no longer sitting on the drop out tab.

I have unscrewed it back out a fair bit to close the gap. Does it look about right to you? Or is the gap still too big? Gears are changing fine, just trying to figure out some of the noise.


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What would be good is to see a picture of someone else's for comparision?

thanks

DirkVoodoo

Shift to the innermost rear cog, which is the largest cog. View the upper pulley relative to the largest cog. If the pulley is rubbing against this cog, tighten the B-screw to increase upper pivot spring tension, which pulls the pulley back and away from the cog. If there is a large gap between the upper pulley and cog, loosen the screw. To find a good setting, loosen the B-screw until the upper pulley begins to rub, then tighten the screw to get clearance.

anoble66

thanks dirkvoodoo. I already have the screw pretty much all the way out, I can perhaps go another turn or 2. But to be honest, the screw doesnt seem to make much difference if its all the way in or out..

The screw is on the drop out tab but appears to do nothing. Have you seen this before where the b-screw tensioner doesnt move the guide wheel up when unscrewed? I have done a lot of reading on this including the shimano docs and I am doing everything correct, I am just not getting any movement at all.

Lumen

Lube it, wiggle it, hit it with a hammer.

anoble66

ha thanks, tried most of that already Have a feeling the only other thing it can be is that the chain is slightly too long which is stopping the adjustment screw from having any impact.....this is so annoying.

Lumen

The gap looks too big. At the risk of insulting your intelligence, you are in the small ring aren't you?

anoble66

Yip, small ring at front and large sprocket on the rear....its definately not right though is it?

Lumen

anoble66 wrote: »

Yip, small ring at front and large sprocket on the rear....its definately not right though is it?

No, but in my limited experience of b-adjustment having it too slack won't make noises it'll just dull the shifting a bit.

anoble66

thanks Lumen. I am the type of person that if I know something is not right it will slowly drive me insane, so I am going to have to figure this out.

Not going to chance wrecking my chain by taking out links myself, because I believe once you remove the connecting pin on the 7900 chain you need to replace it with new pins - which I dont have.

Suppose another trip to the cycle shop is in order.