You may never forget how to ride a bike, but remembering how it should fit is another story. For competitive cyclists, even minute adjustments to the frame can have a major impact on comfort and performance. Despite this, bike fitting has long been a black art with each technician employing her own method and metrics (plumb bob, video, rulers, etc.). Most methods have been inaccurate, tough to reproduce and based on the static position of the rider (not pedaling). Meanwhile, opposing views on the right fit have been difficult to reconcile without a standardized measurement method. Now Retul has introduced a motion-tracking system that may put those issues to rest.