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Bike Fitting

Retül Bicycle Dynamic Fit

Retul Bike Fit

In association with San Diego Sports Medicine Peak Performance, Nytro offers advanced road and tri bike fittings using the exclusive Retül motion.

Retül provides bike fit tools, technology and training to guide qualified bike fitters in making objective and comprehensive bike fit decisions. Retül uses a cycling-specific 3D motion capture system that reads a rider's movements while he or she is pedaling on the bike, and records all three planes of movement (3D). This type of data reflects how a rider actually rides a bike and cannot accurately be captured with 2D video, static fitting, or eyeball fitting. Retül's dynamic fit tools allow a bike fitter to make fast and easy adjustments to a rider's position using objective and highly accurate fit data to guide the changes.


San Diego Sports Medicine Peak Performance


San Diego Sports Medicine offers custom cycling and running programs to analysis and cycling specific assessments, featuring RETUL bike fit, blood lab and Metabolic (VO2Max) testing by Master's level Exercise Physiologists. The physicians sign off on the EKG's and oversee the packages that involve physical, labs etc. or if consulting is needed on a orthopedic issue.


RETUL Bike Fit - $325

  • Biomechanical analysis
  • Cycling-specific flexibility/functional strength assessment
  • Dynamic data capture of 3D full body movements to determine optimal position
  • Real-time recording of power output and physiologic response to help determine optimal position
  • Comprehensive digital reports of 3D and 2D body parameters, 3D bicycle fit coordinates, and bike frame geometry.


If you are scheduling for a Performance Test, including, Retul all appointments must be made 2 business days in advance. If you need assistance please call (858) 793-7860 ext. 220.

View complete SDSM Peak Performance Cycling & Running Packages



Nytro F.I.S.T Certified Bike Fitting


All of our Road and Triathlon/TT bikes include a FREE professional sizing session that helps determine what brand/model is recommended based on your body mechanics. Our experienced staff is fully F.I.S.T. certified in order to determine your optimal riding position for comfort and performance.

Why Nytro?

  • Fitting by F.I.S.T certified bike fitter (FREE with every bike)

  • Road /Triathlon bike brand / model recommendations.

  • Full custom fit analysis to improve optimal comfort and performance.

  • FREE Lifetime fit /adjustments with any bike purchase.

F.I.S.T Bike Fit Pricing 

  • FREE (Nytro Purchased Bike)

  • $150.00 per hour, prorated based on actual time needed (non-Nytro Purchased Bike)

  • If you are unable to visit our store location we will happily advise on basic sizing over the phone
    at 800.697.8007 or via email at