Rear derailleur

kennygalbraith Posts: 101
edited May 2013 in The workshop
Hi guys, so much too learn :-)

I've taken my rear derailleur off because I thought it was needing a overhaul, although I think the problem was the cable sticking in the casing. Anyway the two jockey wheels are quite wobbly, can they be replaced or better upgrading it? I'm doing 3000+ a year (just completed 3k miles)so I need to make sure it's in tip top nick...

REAR DERAILLEUR Shimano Acera, 9-speed, top normal

Thanks for advise, again. (We all need to learn...right)