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Bicycle Gear Calculator — Bike Gears

By JPMartineau

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Summer Sale: 40% OFF to celebrate Bike Gears being featured in the App Store's "Apps for Cycling" section.

Designed by a cyclist, for cyclists, Bike Gears is the premier Bicycle Gear Calculator for the iPhone/iPod Touch. Calculate Gear Ratios, Gear Inches, Development and Gain Ratios using your bike's measurements. The app now has over 200 preset tire sizes and also lets you enter your own custom tire size for personalized measurements.

Building a new bike from scratch? Test out possible configurations and get it right the first time.

Find equivalent gearing configurations to reuse components you already have, or even to save weight by using smaller gears!

Want to convert your old hardtail into a single speed? No problem: take a ride on a geared bike to tweak your gear ratio, then calculate the equivalent ratio for your single-speed. Best of all, it doesn't matter if they have different tire sizes!

Enjoy skidding on your fixie? Using the Skid Patch Analyzer, you can visualize your tire's wear spots and choose optimal gearing to maximize your tire longevity!

No more what-ifs, no more guestimating, and most importantly, no more costly mistakes.

Bicycle Gear Calculator is a must-have for bike builders, bike mechanics, athletes, coaches, BMX riders, commuters and alleycat racers alike! But don't take my word for it – read the reviews and see what cyclists like you are saying.

What's New in Version 2.0.3

- Added 135mm, 140mm and 145mm crank sizes
- Added 26 × 1 (19-451) tire size
- Corrected 26 × 1.375 and 700 × 37c tire sizes

iPhone Screenshots

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Customer Reviews

Vary good for the track

I just saw some reviews wanting for a 36t cog option stating that was common these days in MT biking. This app is directed to the track or street fixy use and you would never use a anything bigger than a 16 or 17t for worm up on the track. I know people will go a bit bigger for the street. I like the tools that show speed and times for the Flying 200, and Kilo. Sometimes its hard to use the slider function for the speed which doesn’t hold were you slide it too. Maybe if you could type in the speed as an option would be good. I would also like to input single digit increments for speed and cadence instead of every 2 or 3 kph. Also for winter roller work and races the top speed and cadence is too limited. I needed 300 + at over 100kmp ability and this doesn't go up that high. But for practical track per poses it covers everything. I use it all the time and play with all the possible variables for gear and cadence for each event. Match sprint, Flying 200, Kilo, and Keirin. Its great.

Great App

This app was instrumental in convincing me (and my bike shop mechanic) that I should convert my new 2x10 to a 3x10 for the type of terrain in my area. Quick, easy, wealth of information, and with great explanations for terms and concepts to boot! This is a must have for anyone interested in comparative gearing.

Not what I expected

I was expecting a bike computer that I could use while riding for speed and distance readings. This app is not for that, as the description does state. This app is for mechanical purposes. Do not get mislead by eagerness to have a riding speed and distance computer like I did. This is a fine product for mechanical calculation purposes, not while riding computations.

Bicycle Gear Calculator — Bike Gears
View in iTunes
  • $4.99
  • Category: Sports
  • Updated:
  • Version: 2.0.3
  • Size: 0.5 MB
  • Languages: English, French
  • Seller:

Compatibility: Requires iOS 2.2.1 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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