That is an app for the iPhone.
Chainring: Bicycle Gear Calculator
PS. I made it, so you're welcome to DM any feedback. Thanks
Just downloaded this. It looks really nice and simple. I only really want to calculate Gear Inches so it works for me, but agree with many of the comments above. I have a kid who races and is gear limited so I also agree that there might be a use there. I’m assuming you used 700 wheel size but you should state what you did use. Nice clean interface and graphics.
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