Shane emailed us and wanted to know if there is a size difference between the XS400 and XS650 rear calipers. He also asked if there is a big difference between the front and rear calipers. And what is the measurement between centers of mounting holes?
Answer: There is a size difference between the XS400 and XS650 and the rear calipers have a completely different shape than the fronts.
The measurements from center hole to center hole is roughly 112mm.