Hi. I need to get a new speedometer for my cb550. I've read here on the forum that the ratio on old japanese bikes is 2240:60. But i guess that is for the ones in MPH, right? So, what is the same ratio converted to KPH? I've seen alot of different ratios, and I don't know which one is right. For example 1:2, 2:1, 1:4, 1:1.