Once a guy, an addicted to fixed-gear bicycles, decided to create an application worth a community. That's how the Chainring was born.

Chainring helps you quickly calculate all necessary characteristics of your fixed-gear or single speed bikes like a ratio, a number of skid patches, development, gear inches, and a recommended number of chain links.

Gear Ratio.
The ratio of chainring teeth to rear sprocket teeth means how many times your rear wheel turns with each revolution of pedals.

Skid Patches.
Value predicts how many spots (skid patches) will wear on a rear tire while a rider brakes with one foot or both feet (ambidextrous skidder).

Development is a distance that a bicycle travels with every revolution of pedals.

Gear Inches.
Values typically range from 20 (very low gearing) via 70 (medium gearing) to 125 (very high gearing). Low gearing is for going up hills, and high gearing is for going fast.

Chain Links.
Value shows the recommended number of chain links for a regular chainstay length of the track frame.

All graphics in the app are carefully drawn and animated with love to details. The prototype of the design was my bike, which I built on my own with components of Cinelli, Campagnolo, and a bit of Dura-Ace.

You're always welcome to contact me and share your ideas. I'll appreciate that.

What’s New

Version 2.0

Just instantly share your bike calculations to social networks.

Ratings and Reviews

4.8 out of 5
33 Ratings

33 Ratings

Castone ,

A must have!!

Really helpful tool to work out how to get the best from your bike. If your a climber or speeder or jumper on your bike then you need this app! Helps you work out the best gearings you need for the job, depending on your preferences.

Developer Response ,

Thank you a lot for your review. This words make me happy 😃

App Privacy

The developer, Oleksii Osynovskyi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Linked to You

The following data may be collected and linked to your identity:

  • Identifiers
  • Usage Data
  • Other Data

Privacy practices may vary based on, for example, the features you use or your age. Learn More


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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