Bike Fit Plus 1 is a precise tool to help you fit your new bike. It uses the total stack and reach numbers of your current bike, as it's currently set up. If you know those numbers you can enter them directly. If you don't know them, then Bike Fit Plus 1 will calculate them for you, based either on your frame stack and reach or your basic frame geometry.
Using those numbers, the program first searches a growing database of currently more than 600 frames, to find out which frames *can* fit you. Then, it runs a proprietary algorithm that produces and checks thousands of possible fits to create a list of specific, dialed-in setups that will fit you *perfectly*.
Users can narrow their database search to look for specific brands, models, and years. The end result is specific numbers that will tell you how to make your new bike fit precisely like your old bike.