1 - true - between the 13 and 15 is a difference of 2 inches in the diameter of the rim (and then between the 70 and 60 - 10cm more) - now add all that up and think of the circumference. Which is why some people can put a 17" rim with low profiles (50) and still have the same circumference as a 15" wheel with a higher profile (say 70 or 80) - Ok I have not done the math with that but just for illustrative purposes.

I also know when I was fitting a digital speedo on a bike, there are various pre sets depending on the bike type (for MTB, road bike) and the tyre size...

2. I think the optimal is 90kph for an everage engine (1800cc).

OK, now for my question - if a man says something, far away in a forest, where no woman can hear him, is he still wrong?

Like what in the forest?

during the act of susuing/peeing/guthuguma..one MUST pollute the air/fart/guthuria, if not so, then you have a serious medical condition...if its a fact..then you heard it from Mlefu..otherwise..i am not such a dada head!!!!!

Can a man pee under the water???......both types!!!!

i am thinking the speed mechanism is independent of the tyre/rim size..unless you cnage the hub,arm and the steering .

@60kp/h most engines would be on gear 3...hiyo ingine sijui