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MTBs are tricky. A wider bar has the same effect as a shorter stem on a road bike - it brings your upper body forwards - so it depends what width bar you'll be using. Which in part depends what terrain you'll be riding, which also determines the seat tube angle. And that's going to depend in part on how long the front end of the bike will be. And whether or not you'll be using a dropper post. Internet bike fits for road bikes are hard, but I reckon they're even harder for MTBs. Another trip to Scherrit sounds like a good plan.
Brommers
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!