Keith Oates said:
This is beginners not P&L, zizou has asked a perfectly valid question so there is no need start a slanging match.
Indeed, I apologise for being side-tracked by the snobbery.
I've been riding off-road for about 5 months, I've done about 100 miles a month so nothing too significant but I've had a lot of fun doing it.
Last Friday, I picked up my first new road bike in over 30 years. I did a quick 16 miles on Friday night, mostly to make sure that nothing fell off, then did nearly 40 miles on Sunday morning. As it was deep into the North Downs, it took about 3 hours to do complete that distance but, despite my prior concerns, I had no bum-issues at all.
As GilesM says, it's a very different type of cycling. The different position is putting more of my weight through my arms. I do miss front suspension, though, the roads through Berkshire, Surrey and Sussex were pants and made it much harder work than I had expected.