Use the form below to pick your bike model. If your bike isn't in the list, you can input the frame geometry directly in the "Stack" and "Reach" fields. If you leave these blank, the fit chart will show the stack/reach information for Alpha One alone.

The chart below shows the stack and reach information for Alpha One, complete with the correct position of the Monopost, and the appropriate Stem Spacer used below the aerobar, for each setup. Note that Alpha One includes four different Stem Spacers, in 10mm, 20mm, 30mm, and 40mm stack heights. Only one spacer should be used (do not combine spacers). Here's how to use the chart:

1-Find your Stack in the left-hand column of the chart, or the row that most closely matches your stack. Every cell in this row represents a way to set up Alpha One that will produce this stack number.

2-Each cell states the position of the Monopost, as shown by the numbers and hashmarks on the back of the Monopost, as well as the appropriate Stem Spacer to use in order to hit your stack number.

3-In most cases, there will be multiple cells that can hit your stack. The best setup for your position will generally be the one with additional colored cells above AND below your selected cell. These cells represent room to move up or down in the future merely by adjusting the Alpha One Monopost. This can be done by loosening the single bolt at the front of the bar, and is by far the fastest and easiest way to make a position change.

4-Once you have selected a cell from your Stack row that represents your preferred position, look at the bottom of that column to the Reach section. The three rows of Reach cells show the reach to the center of the pad based on the three different adjustment positions available on Alpha One's included Ergo Cups. Select the one that most closely matches your Pad Reach number, and set up your pads/cups accordingly. Note that even if the reach is not a perfect match, that may not make a significant difference to your fit. Our Ergo Cups are longer than most other pads, at 115mm front to back. That means that even if the center of the cup is slightly different from where you are used to, the additional length of the cup might support your arms the same way as a shorter cup would. As long as your shifters are adjusted to the same position, and your pads are at the same height, your body position will remain the same.

5-Alpha One is meant to be used without the headset dust cap and round fork spacers that came with your bike. Instead, both Alpha One's base bar and its integrated Stem Spacers feature an integrated dust cover that means you can remove the one included with your bike. This is how the Fit Guide below was measured, and also makes for the most aerodynamic setup.

6-Note that fit numbers for the Alpha are measured from the headset to the top/center of the pad. Some fit systems measure to the back of the pad. If your fit numbers are measured to the back of the pad, add 60mm to your stated reach number to get to the pad center for Alpha One.