Some tech savvy cyclist came up with a fixed gear calculator that can be downloaded as an iPhone or iPod Touch application via the iPhone App Store. The fixed gear calculator is capable of calculating gear ratios, gain ratios, gear inches, and development – to list a few. The calculator is only offered in English at the moment and requires at least 1MB of disk space on an iPhone running 2.0 software or an iPod Touch. Check out more details here.