Q factor
Road bikes ~150mm
Mountain bikes ~170mm
https://www.cyclingnews.com/features/what-is-q-factor-and-does-it-matter-to-you
https://www.renehersecycles.com/cranks-have-landed
Due to bottom bracket size, minimum chainline guidelines and chainstay length, there is an acceptable range for Q-factor, which is typically between 150mm and 170mm. Road bikes tend to have a narrower Q-factor (150mm), while mountain bikes tend to have a greater Q-factor (170mm). This is due to increased tyre width, which forces the cranks out further from the midline of the bike to maintain clearance.