My MOT is due in a couple of weeks, and whilst washing the car last night I found a small rip in the side wall if one of my tyres, where the alloy had been curbed !!!. Anyway, as I understand it, this becomes a failure if you can see the canvass through the rip. So, is it possible to repair this damage, by 'sticking' down the rip with some sort of silicon adhesive??, or will I have to fork out for 2 new tyres on the back ?? The local garage is offering some Maxis (225x40x18 ZR) @ £75 each, whilst his best price for a 225x45x18 is about £150. I've got 4x40 profile at the mo, and with that sort of price difference I can see why !!