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	After entering the rider's measurements, First Gear calculates the ideal bike size based on extensive biometric data. A photo from an Internet auction lets First Gear calculate frame size, standover height, or practically any measurement you wish.
	Tell First Gear about your bike and it will show all your gear sizes, as well as the bike running in real-time. Hard-core single-speed and fixed-gear fans can find gear combinations that will fit their frame, even as the chain wears. Accurate length calculation enables frames with vertical dropouts to be used without a tensioner.