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  • 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!

  • Not sure on the Karate Monkey, but the trend these days is to size up and use a shorter stem/wider bars. Saddle should likely be further forward than on your road bike to aid seated climbing. Most MTB seat posts are inline. Dropper seat posts are quite long so bear in mind the seat tube length, shorter is better so you can use a long dropper post. Flat pedals and feet placed in the mid foot position offers greater levels of control off road, so if you currently pedal with the balls of your foot and "toes down" then you'll need to drop your saddle quite a bit. Shorter cranks can also be beneficial to help avoid pedal strikes.

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