probably not significant if at all
If they fit your frame, the XX1 narrow-Q version is 156, which is halfway between the ~145 or road cranks and ~168 of most ordinary MTB cranks. You'd have to find the current position pretty annoying to want to spend £300 on new cranks.
Crikey. Yeah, nah. This relates to the question the other day about resurrecting my M952 XTR chainset which has narrower Q.
@Stevethecoffee started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
If they fit your frame, the XX1 narrow-Q version is 156, which is halfway between the ~145 or road cranks and ~168 of most ordinary MTB cranks. You'd have to find the current position pretty annoying to want to spend £300 on new cranks.