It looks like this tool measures length and angle. Others measure the horizontal and vertical distance between two points. Why be different?
Taking a different approach to anything must provide a tangible benefit to overcome natural resistance and the fear of a long learning curve. The benefit of VeloAngle’s approach is that measurement is made directly between the two points in one step. Traditional X-Y measurement (over and up/down) requires two separate measurements during which the position of the measuring devise must be kept stationary. Our development testing showed that the Polar measurement (length and angle) approach provided better accuracy and repeatability. Also, as an alternative zero plane can be set on the inclinometer, bikes can be measured on a stand or are otherwise not level. This isn’t possible with bubble levels and some inclinometers. We realize that a fitter or someone in a bike shop that sets up bikes regularly has a feel for X-Y measurements, so the VeloAngle App was developed in part to provide Polar/X-Y conversions for all measurements. Ultimately, thinking of bike setup in terms of length and angles makes sense. The “feel” of a 100 mm handlebar drop from the saddle would change significantl depending on the on the size of the bike. On the other hand, a 5 degree drop is more universally informative. After all, we define how a bike feels and handles based on frame tube and fork angles. The same is true of fitting the rider to the bike, where flexure angles are used as starting points for optimizing efficiency. It should also be pointed out that X-Y measurement is the standard measurement in many fields simply because bubble levels can tell us something is plumb or level, but until recently accurate angle measurement has been unavailable or expensive.
The setup for measuring saddle tilt looks unnecessarily complex. Why did you do it that way?
Do “crank axis”, “bottom bracket” and “BB” mean the same thing? Why be not be consistent?
Why measure between the crank axis and handlebar? Isn’t measuring the handlebar from the saddle more common and preferable?
Determining the location of the handlebars from the saddle is more common and does seem to make more sense, as the rider is not directly connected between the cranks and handlebars. In its standard configuration VeloAngle measures both the handlebars and the saddle from the crank axis because it provides the best combination of speed and accuracy at the lowest cost. The fixed pin adapters provide the ultimate in both accuracy and convenience. The avialabe Saddle-Handlebar Adapter does allow measurement from the saddle to handlebars. It was developed primarily for handlebar tops that are not round near the stem, as the standard adapter locates the center of the bar in a Vee for accuracy. Whichever spot the handlebars are located from, the VeloAngle App will calculate the third side of the BB/saddle/handlebar triangle to provide a complete description. Following common convention, the handlebar is defined to its center from the BB and to its top from the saddle.