Here is a "competitor" which I have found extremely useful when choosing drivetrain parts: http://www.gear-calculator.com http://www.gear-calculator.com These

Here is a "competitor" which I have found extremely useful when choosing drivetrain parts: http://www.gear-calculator.com http://www.gear-calculator.com These are really helpful if you have a bike you mostly like and want to upgrade the gears, or if your current bike doesn't have the gears you need. It has become especially important during the recent trends of moving from 3x front gears to 2x to 1x.