Currently running a Hutchinson Toro 26 x 2.35 upfront on a 26inch Easton EA90XC rim. The wheel spec says 19mm rim will accept tyres upto to 2.35mm.
So if I swap this to a typical 2.4mm width will it make any difference or will I die at some point. (such as a conti mountain king 2)

I ran a 2.4 mk on Mavic 719 rims (with 19mm internal width) for ages with no probs.

2.4mm on the other hand…

It’ll be fine.

Just remember all 2.4 tyres aren’t created equal. A 2.4 conti MK would be fine (I have a mate who runs one on a 17mm rim and he hasn’t died yet), however I’d be a bit dubious about running a full size 2.4 such as a maxxis ardent on them.

thought so, have the conti’s on another bike and miss the grip

mk2.4 is 2.2 wide