For anyone who is interested, I have created an Excel Spreadsheet Gear Calculator for the Alfine/Nexus IGH. I know all this information is available on Sheldon Brown's site, but I got frustrated with a slow internet connection, and having to reload a page every time I wanted to see a different bit of information.
So I put everything (Rear Cog equivalents, Overall Gear Ratio, Gear Inches, Metres Development, Gain Ratio, KPH and MPH) into one easy to tamper with spreadsheet, so you can see everything right there in front of you at the same time! And you can fiddle away with all the variations (Chainring size, Rear cog size, nominal wheel dia, tyre width, Crank length, Crank RPM) til your heart's content...
Can't figure out how to attach an Excel Spreadsheet on here, but if anybody wants it, either send me a PM or drop me an email to email@example.com and I'll send it to ya... It's only about 30kb attachment anyway, so isn't big.
Hit me up if you want it... Might go and have a go at doing a Rohloff one now too...
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Alfine/Nexus Gearing Calculator