stop pissing about with his tyres
he probably won't be seeing the funny side any more ;-)
alternatively
check rim tape
check for sharp bits along the rim that might be puncturing
some types of tyres have very soft side walls and if underinflated can get pinch flats very easily
stop pissing about with his tyres
he probably won't be seeing the funny side any more ;-)
alternatively
check rim tape
check for sharp bits along the rim that might be puncturing
some types of tyres have very soft side walls and if underinflated can get pinch flats very easily