bad wheel bearings are BAD
first they start to make a noise, eventually they collapse which is really BAD
it also makes em a real bitch to get out
get the bearings from a bearing place they have a small number on them
prob $5-$10 a bearing
Mate with Aprillia needed 2 rear bearings , the sprcoket bearing and a couple of seals $50 at the bearing mob with the list in hand that we foound on the web ,
$490 from aprilia

a 10 x markup and this is besides the fact that the bearing mob makes plenty out of it as well