fit

This page is a dynamic tool that will show you the stack/reach of Alpha One on YOUR particular bike. This Guide can help you replicate your current bike position on Alpha One, or set up a new bike with Alpha One based on numbers from a bike fitter. This Guide contains a database of the stack/reach numbers for most modern triathlon bicycle frames, as well as the actual stack/reach numbers for Alpha One. The Guide combines these numbers to produce a chart of actual X/Y coordinates of your pads measured from the bottom bracket. This coordinate is the most important number that bike fitters use to determine your position on a triathlon bike. The steps below provide an easy-to-follow system for making sure you have the perfect fit with Alpha One aerobar.







Step 1: Determine your current fit numbers Show instructions »

Step 2: Select your bike

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.

Brand:

Model:

Size:

Frame Stack (to Headset):

Frame Reach (to Headset):

Step 3: Find your position on the chart Show instructions »

Pad Stack
(BB to Top of Pad)
 
175mm Monopost: 8,
40mm Stem Spacers
       
170mm Monopost: 7.5,
40mm Stem Spacers
       
165mm Monopost: 7,
40mm Stem Spacers
Monopost: 8,
30mm Stem Spacers
     
160mm Monopost: 6.5,
40mm Stem Spacers
Monopost: 7.5,
30mm Stem Spacers
     
155mm Monopost: 6,
40mm Stem Spacers
Monopost: 7,
30mm Stem Spacers
Monopost: 8,
20mm Stem Spacers
   
150mm Monopost: 5.5,
40mm Stem Spacers
Monopost: 6.5,
30mm Stem Spacers
Monopost: 7.5,
20mm Stem Spacers
   
145mm Monopost: 5,
40mm Stem Spacers
Monopost: 6,
30mm Stem Spacers
Monopost: 7,
20mm Stem Spacers
Monopost: 8,
10mm Stem Spacers
 
140mm Monopost: 4.5,
40mm Stem Spacers
Monopost: 5.5,
30mm Stem Spacers
Monopost: 6.5,
20mm Stem Spacers
Monopost: 7.5,
10mm Stem Spacers
 
135mm Monopost: 4,
40mm Stem Spacers
Monopost: 5,
30mm Stem Spacers
Monopost: 6,
20mm Stem Spacers
Monopost: 7,
10mm Stem Spacers
Monopost: 8,
No Stem Spacers
130mm Monopost: 3.5,
40mm Stem Spacers
Monopost: 4.5,
30mm Stem Spacers
Monopost: 5.5,
20mm Stem Spacers
Monopost: 6.5,
10mm Stem Spacers
Monopost: 7.5,
No Stem Spacers
125mm Monopost: 3,
40mm Stem Spacers
Monopost: 4,
30mm Stem Spacers
Monopost: 5,
20mm Stem Spacers
Monopost: 6,
10mm Stem Spacers
Monopost: 7,
No Stem Spacers
120mm Monopost: 2.5,
40mm Stem Spacers
Monopost: 3.5,
30mm Stem Spacers
Monopost: 4.5,
20mm Stem Spacers
Monopost: 5.5,
10mm Stem Spacers
Monopost: 6.5,
No Stem Spacers
115mm Monopost: 2,
40mm Stem Spacers
Monopost: 3,
30mm Stem Spacers
Monopost: 4,
20mm Stem Spacers
Monopost: 5,
10mm Stem Spacers
Monopost: 6,
No Stem Spacers
110mm Monopost: 1.5,
40mm Stem Spacers
Monopost: 2.5,
30mm Stem Spacers
Monopost: 3.5,
20mm Stem Spacers
Monopost: 4.5,
10mm Stem Spacers
Monopost: 5.5,
No Stem Spacers
105mm Monopost: 1,
40mm Stem Spacers
Monopost: 2,
30mm Stem Spacers
Monopost: 3,
20mm Stem Spacers
Monopost: 4,
10mm Stem Spacers
Monopost: 5,
No Stem Spacers
100mm Monopost: 0.5,
40mm Stem Spacers
Monopost: 1.5,
30mm Stem Spacers
Monopost: 2.5,
20mm Stem Spacers
Monopost: 3.5,
10mm Stem Spacers
Monopost: 4.5,
No Stem Spacers
95mm   Monopost: 1,
30mm Stem Spacers
Monopost: 2,
20mm Stem Spacers
Monopost: 3,
10mm Stem Spacers
Monopost: 4,
No Stem Spacers
90mm   Monopost: 0.5,
30mm Stem Spacers
Monopost: 1.5,
20mm Stem Spacers
Monopost: 2.5,
10mm Stem Spacers
Monopost: 3.5,
No Stem Spacers
85mm     Monopost: 1,
20mm Stem Spacers
Monopost: 2,
10mm Stem Spacers
Monopost: 3,
No Stem Spacers
80mm     Monopost: 0.5,
20mm Stem Spacers
Monopost: 1.5,
10mm Stem Spacers
Monopost: 2.5,
No Stem Spacers
75mm       Monopost: 1,
10mm Stem Spacers
Monopost: 2,
No Stem Spacers
70mm       Monopost: 0.5,
10mm Stem Spacers
Monopost: 1.5,
No Stem Spacers
65mm         Monopost: 1,
No Stem Spacers
60mm         Monopost: 0.5,
No Stem Spacers
  Pad Reach (BB to Pad Center)
Pads: +20mm » 108mm 111mm 114mm 117mm 120mm
Pads at Center » 88mm 91mm 94mm 97mm 100mm
Pads: -20mm » 68mm 71mm 74mm 77mm 80mm
  All reach numbers above are measured to the center of the pad. Some fit systems measure to the back of the pad instead. Our Ergo Cups are 115mm long, so subtract 60mm from the reach numbers above for back-of-pad fit numbers.

Our Ergo Cups are much longer than many other arm cups on the market. Therefore, if the reach numbers above do not match your desired fit perfectly, small differences (10-20mm) may be negligible.