A place for more technical discussions. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.
I have found that Insa Turbo's come up slightly bigger than other brands, so although in theory they are 29 inches, put them up against your 30 inchers and I bet there will not be a full inch of difference, if any at all. Assuming both are in new condition that is!
Kirkynut
Good point mate,i'll have to have a wee check. Might even go down the road of standard road tyres and swap for off roading.