I've just been out for a spin on the Bike to the dentist and noticed a couple of times that the back end tried to kick out (going round corners) I know that the back tyre is getting worn, but there's still enough tread there. The tyre was cold, but not too bad and the pressure is right (checked it yesterday) The weather's good and the roads dry. Any reasons for it? It's a BT020 BTW.