Back in November, BikeRadar reported on a drivetrain efficiency study by Friction Facts, and our relationship with the component tester continues to bear fruit, with this instalment investigating the ...

Belt-driven superchargers are a great way to make power, but they require a lot of horsepower to turn—sometimes hundreds of horsepower! That's asking a lot from a lowly serpentine belt originally ...

Everybody knows how a yo-yo works. It's two disks mounted on an axle attached to a piece of string, and it goes up and down if you throw it right. But what about when the two disks and the axle aren't ...

The efficiency of a tooth-on-tooth geared transmission, with the smoothly variable gear ratios of a CVT – minus the belt friction and capable of going all the way down to a zero ratio without needing ...