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HPV Drivetrain Analyzer (note - the page is available in the Internat archive but the calculator doesn't work). Jake Odell has a more elaborate gear calculator: If you want more numbers, including speed and cadence data, speed is given in Mike Sherman's gear calculator. Cohen and Timothy Lipetz for programming help. Too high-tech for you? You can use your slide rule instead! The SRAM/Sachs 3 x 7, 3 x 8, 3 x 9, 3 x 10 and the Sturmey-Archer CS- RF3 and CS-RK3Īre the only recent/current production internal-gear hubs designed to use rear sprocket clusters The Sturmey-Archer-Brompton BWR takes two sprockets,īut other models are included in the list for the benefit of tinkerers - see discussion. Peter Heinle has an Excel spreadsheet online with the tooth counts of a large number of 10-through 13-speed cassettes Wheel Size The ratios are 0.40 for the Mountain Drive, 1.65 for the Speed Drive, and 2.50 for the High Speed Drive. These wonderful calculators are a great way to get your School Store Supplies filled with exciting products that kids will love. You receive twelve of the incredible and fun Magic Calculators six of the Chocolate Calculators and six of the Standard Calculators with lots of features. is behind this latest scam involving the very generous Mr Smith who has. ![]() #Magic calculator dr r smith plus#If you're using a Schlumpf Drive plus an internal-gear rear hub you should enter the actual number of teeth of the front chainring for the first chainring, and this number of teeth times the Schlumpf ratio for the second chainring. Magic Mix Calculators Three Models 24 Count. It does not take any magical powers to foresee you will not receive any money. For brands and models not covered, or if building up a custom cassette, you will need to count sprocket teeth and enter the tooth counts under "custom sprockets." Our cassette page links to additional information on cassette tooth counts. The selection of cassettes is up to date as of February 2018 for Shimano, SRAM, SunRace and recent Campagnolo models. The selection of internal-gear hubs in the Calculator is complete except for one a few new models whose gear ratios have not been made public, and some very rare antiques. If you do a calculation, then bring those to the front, subsequent "results" windows from subsequent calculations may be hidden behind them.įor multiple calculations, you should close each set of results in turn, not hide them. The small one will overlay the large one in a browser which supports tabs. Many internal-gear hubs listed and some of the cassettes are no longer in production.Ĭlicking on "calculate" generates two new output pages: a full-size one, and a small one which you might print out and tape to your bicycle's handlebar stem for reference. This page covers most internal hubs back to the original 1902 Sturmey-Archer. #Magic calculator dr r smith series#Listing of internal hubs is A>Z by manufacturer, then by number of speeds, type and age.įichtel & Sachs, Sachs and SRAM are the same series of hubs, shown together. ![]() One sprocket unless you choose a stock cassette. You need to enter data for at least one chainring, and at least ![]()
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