OTTO Tuning System

The OTTO Tuning System is an ingenious solution for dialing in precise, ultra accurate shifts on your ShimanoSRAM 1011 speed drivetrain. Great for competitive racers, road cycling enthusiasts, and trail riders, the OTTO Tuning System verifies your rear derailleur's alignment issues in less than a minute with the download of OTTO's app in the iTunes store check tech specs for iPhone compatibility. The application is free for checking the rear derailleur's alignment and provides a positive or negative index score, so you can make the appropriate barrel adjustments clockwisecounter clockwise. It also provides angle and twist measurements, letting you know if your rear derailleur is bent. For full derailleur adjustments and tuning guides, you'll have to purchase an OTTO app subscription.