125-200cc tyre uk legality

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?

I don't know anything about UK tire legality, but that thing is smoked, I'd replace it!

Yep it may have passed a MOT but common sense says its well past its sell by date! The wear is caused by the useing the front brake. so if you want the replacement to last longer dont use the brakes

oh, is that why it's worn like that? I'm looking at a normal road tyre to replace it now, lnobbly's just don't handle the tarmac so well. Unfortunately My front brake gets used a lot so guess the new one will just have to bear it so when you say it's past it's sell by date, do you mean it's worn out but still legal if a policeman inspects it or no get rid of it I'll get 3 points for using it??

I have seen front knobbies wear like that before, for example Michelin AC10s do it too. Like Johnny said, I think the braking loads cause that, no idea why.

The point we're making is that it doesn't matter if it's legal or not. It's worn out, and you should put a new one on.

ok I will order a new one tonight, thanks for the input you two