Quote:
Originally Posted by Emjay
if the profile is incorrect then you will get incorrect speedo readings. So if the profile is too high then the speedo reading will read too high and the car will be going slower. For example sppedo reading reads 70 but you are in reality travelling at 65 mph. So the car will feel sluggish. If the profile is too low then the opossite effect applies and you run the risk of speeding. Eg sppedo says 70 but in fact you are travelling at 75mph.
I use this as a great reference site http://www.carbibles.com/tyre_bible_pg2.html |
id of thought if the car had a higher profile, the speedo will read 'less' ??? and likewise if you fitted very tiny wheels, the wheel would have to rotate many more times than normal to cove the same distance, so a smaller wheel/profile would give a false 'high' speedo reading respectively.
However, a taller wheel/tire will be harder for the engine to rotate. But having a 60 instead of a 55 wouldn't make a huge difference, as already stated.
