"geepeetee" wrote...
Hi


..
The problem is the tyres (mainly the back one but i have had problems with
both) loose their shape and develop a wobble.



Gary


Are you sure it's not your rims that are giving you trouble? What you
describe sounds like spokes working loose or breaking, creating an out of
true wheel. Or is the bead of the tire actually trying to unseat itself from
the rim?
--
mark