For all you fellow uk residents out there, I've got a semi knobbly but road legal tyre on my bike atm but it passed it's mot JUST because the garage said the tyre was on the 1mm limit. Well the law says it's 1mm across the central 3 quarters of the tyre, but does it mean every single bit of tread? Because my tyre has worn weirdly, it's got about 3/4 mm for one or two tread sections, then suddenly, A FLAT BIT! then it's ok again for one or two, then flat again. That must be what the guy was referring to but I don't want to ride it if it's illegal. Sooo, does it apply to every single bit of tread or am I ok?? Also it says it's a 2.75 21 tyre, is that the same measurement as a 90 9
0 21 size?

