Posted: Yesterday at 12:57
Are you doing the one day Livvy ?
The off road bits on the bike arent too long. Theres a few miles of canal towpath, some forest tracks and then the muddy bit is only a couple of miles through the forest. I dont think you need great grip on there - but my worry would be punctures. There is a bit of ploughing through some big stones.
I used something like this - http://www.wiggle.co.uk/schwalbe-marathon-plus-smartguard-rigid-road-tyre/
in a 32mm width. They were bombproof.