Some racers use a reverse (opposite of street standard) shift pattern so they can more easily upshift while finishing a turn. With standard shift, they might not be able to get their toe between the road and the lever. Not all racers use this pattern. Mat Mladin supposedly uses a standard shift pattern.
Manufacturers use a standardized pattern. I'm not sure if that came about because of an industry wide agreement or if there was some government legislation involved at some point. The effect is the same -- they are all the same. I have no idea why it is 1st gear is down and all other gears are up. Probably arbitrary.
On most bikes it is easy to switch the pattern if you want. Just reverse the stock linkage. Or if that won't work, aftermarket rearsets almost always allow the pattern to be reversed.
Manufacturers use a standardized pattern. I'm not sure if that came about because of an industry wide agreement or if there was some government legislation involved at some point. The effect is the same -- they are all the same. I have no idea why it is 1st gear is down and all other gears are up. Probably arbitrary.
On most bikes it is easy to switch the pattern if you want. Just reverse the stock linkage. Or if that won't work, aftermarket rearsets almost always allow the pattern to be reversed.