The EXiT Fit Bike is capable of emulating the geometries of various frames in order to allow the rider comparison of several different prospective bikes they wish to purchase, all without ever having to get off of the machine. With the Stack & Reach Database, retailers now have access to the measurements of many different brand name bicycles that they themselves carry in their shop. Utilizing the database with the EXiT Fit Bike may seem complicated, but it is actually very easy to understand. One very important thing to keep in mind is that Stack & Reach only concerns the scales on the front end of the machine. The stack measurement is the sum of two figures. The first figure is the scale reading from the telescopic tubes (in the case below, 498mm). This scale is calibrated to read the current vertical distance from the center of the bottom bracket to the top surface of the black anodized railing (that also holds the handlebar assembly). The second figure is the distance from the top of the black railing to the center of the theoretical head tube top (in blue below). When using the Stack & Reach Pin, this distance will always be 10mm. In the above scenario, adding these two will give you a stack of 508mm. In short, the stack on the EXiT Fit Bike equipped with a Stack & Reach Pin will be the reading from the tube plus 10. Reach on the EXiT Fit Bike is a little bit simpler. It is literally the scale reading from the top of the black railing. This scale is calibrated to give you the current horizontal distance from the center of the bottom bracket to the center of the theoretical head tube top, in the example below your reach is 409mm. Had the particular setup above been optimal for the rider's performance, the fitter would then go to slowtwitch.com and look for frames that have a stack of 508 and a reach of 409. According to the measurements in our example, the "Kuota Kalibur (size M)" seems to be the closest candidate. If one would want to simulate a certain frame on the EXiT Fit Bike, the same principles would be applied, in reverse. For example, say that, even after this optimal performance, the rider still wanted to know what the "Trek Equinox 7 (Size 54)" would feel like. To get the EXiT Fit Bike's stack to 526 one would take away 10 to compensate for the space of the Stack & Reach Pin and slide the handlebar assembly up until the tube reads 516. Then you would slide the handlebar forward until the railing read 414, your reach.