The Retul bike fit - for intermediate to advanced cyclists. How do we create the city's most comprehensive bike fit? With two Retul Competition Fit - Retul 3D motion-capture cameras and a very thorough 2.5 hour fit protocol is utilized for that athlete looking for hard data to back up that optimized position. Retul is the gold-standard in fitting technology, only available to the world's best bike fitters. We employ two of their motion-capture cameras to gather real-time right and left-side position data to confirm that your position conforms to fit university recommended body position values.