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If you were racing XC then you'd probably worry about them being the same. If you're just a hobbyist then you can probably cope with differences. I know mine are different. But I don't do any big miles on the MTBs. You tend to be able to get a lot more adjustment out of an MTB frame (sloping top tube + more seatpost) so you're mostly looking at how long the thing is gonna be. But then you'll likely be running much shorter stem and much wider bars so I dunno where it puts your hands relative to a road bike position, I just adjust mine until I like them. Test ride?
Anyone got any advice for choosing an MTB frame size based on a road bike fit please? Should the saddle be in the same place on both styles of bike?
I have a 54cm Trek Emonda which Scherrit thought was a touch too big, I'm now looking at a Surly Karate Monkey [as a first MTB] and I'm on the cusp of small or medium at 172cm/just over 5'7. If I run my road saddle position [705mm BB to mid-saddle, 47mm of saddle layback], then I reckon the small is the right size.
Can anyone offer any advice? I can share my full road fit if it helps.
Thanks in advance!