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It will be less comfortable. @Dammit was on a retro rigid Klein MTB and is asking about what modern mountain bike he should buy...
To qualify, this is more because I was riding a close to museum grade, all-original (down to tyres, grips) piece of mountain biking history, and started to think about what it would mean to crash and snap it. With that said, I was riding a very stiff, fully rigid bike on 2.1 tyres at 45 PSI - which hit 59km/h on one of the downhills. I was gripping the saddle between my thighs, with my hands sort of cupping the grips at this point - holding on was impossible.
= A modern bike would be (much) more comfortable, I suspect.
It will be less comfortable. @Dammit was on a retro rigid Klein MTB and is asking about what modern mountain bike he should buy...
I think, a regular 100 - 120mm travel hard tail is the perfect general bike for this. The less bouncy from there, the more uncomfortable the more, the harder work.
If i rode this on 30mm tyres on a gravel bike with drops my wrists would be mullered after 40miles. Edit 20.