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Discussion Starter · #1 · (Edited)
Last year I posted an XX1 handy chart to see what front chain ring to buy based on XX gear ratios. Since Shimano has now followed suit with their own 1x11 gear ratio I thought I would redo the chart to now include the Shimano ratios.

A lot of people have commented both positively and negatively on this chart. The bulk of the negative comments are that the math is easy and usually include some reference to the myriad gearing calculators that are out there. When I was choosing my XX1 gearing I did a bunch of searching around to compare the gearing for my existing XX 2x10 with 24/38 in front and 11/36 in the rear in order to decide what would be the best gearing for the very steep bay area mountains for my XX upgrade. I was annoyed by the simple rounding that everyone was doing just to one decimal place which did not give an accurate comparison and a good sense for the gear spacing that is inherent to XX and XX1 or the new XTR 1x11.

Given my background in finance I have always appreciated taking complex mathematical relationships and explaining them in an easy to read chart. So enjoy. Please share it with whoever you want as long as you credit my work.
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drolling, I have not seen your previous XX1 "chart" or the positive/negative comments you received. Apologize up front if you've heard this before.

- First off what you have here is not a chart, it's a table. As a finance guy you should know this. This needs to be turned into clearly labelled graphical plots overlaid on top of each other for easy visual comparison of the available options. Otherwise unless you're Rain Man, it's very hard to get past the first row of numbers and build any sort of picture of how two adjacent columns really compare. I'm not a halfwit, I work with spreadsheets and large volumes of data all the time, and honestly after a few seconds of staring at the numbers my brain just turns off.

- The numbers need to be converted to gear inches for this tool to be useful to a wide audience. If we lived in a world with one wheel size you could skip this step, but as we all know we don't... Your comparison will only be useful to someone who is changing drive trains on the same bike. But many people will want to see what chain ring/cassette combos they need on their new bikes with different wheel size to what they currently have, to closely match the feeling and spacing of their existing gears. For that to work, the numbers have to take wheel sizes into account (i.e. you need to work in gear inches).

Like you, I don't like most of the online gear calculators out there. I'm on your side man, please take this as constructive feedback, finish the job, publish the real charts here, so I don't have to do it myself, ha ha!

Cheers
 
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