Anyone got a Genesis Core 26 kids bike and running wider tyres than the standard CST C-1383, 26×1.95″ tyres which come with the bike? Am considering getting a 2017 model but would like to put wider and more off road orientated tyres on it. What is the max tyre width it will accept?

I’m also considering fitting a 100mm suspension fork in place of the rigid fork but would that completely mess up the geometry so as to make the bike difficult to ride?