I have just started cycling and have a mountain bike. My back wheel on my mountain bike keeps slipping, my journey is a mixture of road and paths. Today I came off my bike as I went off the road onto the pavement. The back wheel just slid down the pavement at the low part where it joins the road. Does anyone have any idea why this is happening. I recently had a full service on the bike and they set all the pressures.
thanks.
thanks.