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bicycle gear calculatorGearCalc Pro Bicycle Gear Calculator bicycle gear calculator


This upgraded version of the original GearCalc bicycle gear calculator has some nice new features. The most obvious of these is the gear position indicator, shown below:

Bicycle Gear Calculator

Also keyboard control has been improved. The up an down arrow keys will now spin the numeric data entry boxes up and down.

The gear usage tables 'suggest' button suggests the best route through your gears based on an algorithm that removes all the smallest steps (ie the duplicates and near duplicates), starting with the gear combinations that will produce the biggest chain angles. The chain angle can be adjusted (as illustrated above) to produce an alternative suggestion.

Two new graph / gear chart plotting options have been added to the assessment. Personally I still prefer the original table which can also be used for cadence optimisation on the road

Why GearCalc Pro?

When I got onto the net, I surfed around to see what my rivals had to offer and discovered that there are already at least three existing bicycle gear calculators - all called GearCalc. I suppose GearCalc is such an obvious name that this was inevitable. I needed some way to distinguish my product from the others, and my program had already been reviewed in three cycling magazines as 'GearCalc'. Arguably the old version was already so much better than the competition, that I should have called it GearCalc Pro in the first place!

Using GearCalc Pro

The GearCalc Pro chart is especially useful for arranging gears to avoid duplicates between adjacent chainrings: just click to add a tooth here, subtract one there, and watch the markers twitch to up or down until the graph is approximately the correct shape. For a single chainring this will be a straight line. But for triple chain rings commonly used on mountain bikes, and some touring bikes, a logarithmic curves are preferred:

Bicycle Gear Chart
This is because a smaller chain ring will produce a closer spacing (as well as lower gears), and because I don't use my smallest rear cog in combination with my smallest front cog, (or biggest front with biggest rear). Clearly the left hand side cogs on my freewheel must be spaced further apart (in terms of number of teeth) to produce an overall even spacing.

After using the 'Gear Usage Table' to weed out the duplicates, the graph becomes linearised, giving eleven fairly evenly spaced gears, that can be traversed with only two chainring changes:

Bicycle Gear Chart
All of the steps between gear changes are between four and eight inches, with the gears closest together at the speeds I tend to ride at most of the time:
Bicycle Gear Chart
Obviously it is impossible to get all the gears exactly the same distance apart, because you can't have half a tooth on a cog. The above shows what I use on my own bike. I use six speed freewheels because they are relatively cheap, this means that I can afford to wear out lots of them. I don't believe that its necessary to use exotic components on a training bike.

I Must be Certifiable!

When you click Print in the Assessment Table the gear calculator provides certification for your bike. I have put some examples of this here

How Did Riders Manage Before The Bicycle Gear Calculator

Back in the dark ages of cycling riders used Gear Inch Ratio Tables and gearing ratio charts But these were a bit of a pain!

Upgrading Your Demo


Complete installation set for GearCalc Pro 1.51 is at (844KB)

Latest executable only (if you have already installed a previous version of the gear calculator, just copy this on top of your existing gearcal.exe v1.51. (88KB)

System Requirements

A 386 or better, running Windows 3.1, Windows 3.11, Windows 95, Windows 98, Windows ME
Minimum screen requirement 640 by 480 pixels 16 colours.

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