I'll say that you can do a TD (your first?) on a BT092. but....it will be dead afterwards. They turn to snot and disappear.
a knackered 090 is not cool...but it mihgt work OK - I would worry about the profile of it and the age...so..I would go 092.
I have done Cadwell on an 092 and it was slimy, squirmy and grippy enough for me at that stage in my riding career.
I would not take one now as I am sure it would kill me.
Your first TD will be cool...so don't worry about tyres - fit the 090 front and 092 rear and it will be enough for you unless you are the new messiah
Saying that - Cammo is right...but he races and ha been doing tracks for a while..
