Hey guys,
I'm doing a 50 mile ride in a few weeks and am looking at putting some road tyres on my MTB. I've narrowed it down to some schwalbe marathons but not sure if I should be running 1.5" or 1.75". With 1.5" it looks like I'll also need new tubes since mine are 1.75-2.25.
Would there much much difference between the two sizes?
There's a MTB thread yknow

Doesn't sound like much of a difference to me, but if it aint 700x23/25 I'm not sure...