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Schlumpf Speed Drive. A Schlumpf Drive is a two-speed planetary gear assembly for use on bicycles and unicycles. It is distinct from other bicycle planetary gear assemblies in that it is located behind the chainring rather than in the rear hub. A push-button on each side of the axle allows the rider to switch between high and low ratios.
Efficiency testing of bicycle gearing systems is complicated by a number of factors – in particular, all systems tend to be better at higher power rates. 200 W will drive a typical bicycle at 20 miles per hour (32 km/h), while athletes can achieve 400 W, at which point efficiencies "approaching 98%" are claimed.
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From a mechanical viewpoint, up to 99% of the mechanical energy delivered by the rider into the pedals is transmitted to the wheels (clean, lubricated new chain at 400 W), although the use of gearing mechanisms reduces this by 1–7% (clean, well-lubricated derailleurs and a straight chainline), 4–12% (chain with 3-speed hubs), or 10–20% (shaft drive with 3-speed hubs).
Tax season is underway, but with Elon Musk having influence over the Treasury Department as head of the Department of Government Efficiency (DOGE), there's some confusion surrounding tax returns....
Kalkhoff logo Kalkhoff bicycle. Kalkhoff is a German bicycle manufacturer based in Cloppenburg; it was founded in 1919 by Heinrich Kalkhoff (* 30.November 1903; † 25. September 1972) as a family bu
DOGE wants access to filers’ data, and the commerce secretary says Trump wants to scrap the IRS. But filing a return remains mandatory — the earlier the better, tax advisers say.
Just as retailers use Thanksgiving Day turkey promotions to attract customers, some grocery stores around the country are offering lower egg prices to drive store traffic.