Bigger Cassette

[Dale]

I've removed my 11-28 and replaced with a 11-34 (I live in Cornwall it's hilly) jockey wheel and cassette are now hitting on the 34. I've adjusted the B screw all the way in but still hits. It's all Shimano 105 though no idea if it's a long or short derailleur. Anyone got any answers for this problem apart from putting the 28 back on. Thanks in advance.

[tenbikes]

Longer screw is first thing to do. Common problem and common solution.
Fitting the original screw backwards can also work.

[Dale]

[Dale]

Thanks Tenbikes did wonder if that was a possibility. Not putting it the other way around though, I'll give that a try until I can find a longer one.

[rareposter]

Yeah you've exceeded the capacity of that mech by about 4 teeth at least, maybe 6.

Long cage would work or you could fit a Wolftooth mech extender.

I've got a Dura Ace mech from roughly that era and it'll accept 30 at a real squeeze...

[tenbikes]

Yep , Wolftooth ( or the many equivalent s) is the take 2.....

[Cyclothesist]

It looks like an SS cage too so you're pushing capacity beyond what's reasonable. With a GS cage 11-32 is definitely ok and 11-34 probably so. You can just swap cages over. I know for sure a GS RD4700 cage fits an RD5700.

[Brucey]

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.... It's all Shimano 105 though no idea if it's a long or short derailleur.....

RD-5600 existed in two forms, SS and GS. I think you have the SS version there. However, it matters not if you have this or the GS version, shimano say the largest sprocket capacity (LSC) is the same, 28t. Where the two versions differ is in total capacity (TC), which is either 29t (SS) or 37t (GS). In those days Mr Shimano expected you to buy a triple and use the GS mech if you wanted to do something crazy like go up hills.
If you want lower gears, it has to be smaller chainrings at the front or bigger sprockets at the back. A cheap hanger extender will give you more LSC but not more TC. You do pay a price for this though, which is that the RD is further away from the smaller sprockets. This may not matter too much with all-new/shimano parts, but if they are worn and/or mismatched then it might.

[KM2]

Cheap gear extender will suffice, but always best to have a mechanism which fits.

[Dale]

Thanks for all the good advice, might just stick with the 28 for the moment.