Parts and kit for riders who use the bike

The new standard tests rotational impact and tests the helmet at more points, at more speeds. A 22.05 lid is not unsafe, but it was never asked the questions 22.06 asks.

Most bikes share engine oil with a wet clutch. Car oils carry friction modifiers to save fuel — and those same modifiers are what make a clutch slip under load.

A chain does not stretch. The pins and bushes wear, the pitch grows, and the sprockets start to hook. Here is how to measure it rather than judge it by eye.