I’ve just bought a used GT Grade it’s currently on 28c tyres and after my first foray off tarmac today I think I’d like some more voluminous rubber.

So the question is what are the biggest tyres I can use on GT Grade and what tyres would you recommend? It’ll be mainly used on the road so slick or semi slick are what I’m thinking.
Oh, and it’s a 2015 Grade I think.

I’ve fitted some Schwalbe Smart Sam 700×35 cross tyres on my carbon grade and it’s pretty tight – don’t think it’d take a 40 without rubbing the fork and chainstay.

I run 32’s with guards. I think 35’s is the biggest people manage, have seem 38’s but depends on rims

I’ve got Vittoria voyagers 35mm fitted with some SKS guards – not a lot of room for anything much bigger

Not used the vittoria voyagers but people seem to love them and they are cheap from planet x

My other half says on the carbon model, 35. Having had to have a replacement following a bigger tyre/chainstay interface disaster…

Thanks everyone, looks like 35 is the number.
Just need to pick out a tyre now!

They are only 28mm, but £50 for a pair of Schwalbe Ones is a great price. 😉

https://www.merlincycles.com/schwalbe-one-folding-road-tyre-700c-65466.html

No bigger than what I’ve got now. Any more suggestions?

Go for something Compass – available here

I’ve still got a set of unused 40c land cruisers if you want em

Edit…didnt see the magic number. Forget it