Does anyone know if the cranks would be cross compatible? I need to replace my XTR cranks as there is a groove developing on the spindle (12000+ miles). My LBS have recommended a new XTR crankset, but also know tat I will be upgrading to the new frame in the next 6 months. So my question is would new 9100 XTR cranks suitable for the Ripley 2 fit the Ripley 4. I can't find any mention of chain lines for the Ripley 4 to guide me.