Often wondered if you had a car with distinctive spokes like a 5 spoker AMG, and jacked the car up to set the spokes so they were exactly aligned, ie both top spokes exactly vertical.

How long would you drive before the spokes went out of sequence?

In theory, never - because both wheels are running on the same road, one following another in the same footprint.

In practice, I guess some tire slippage on loose chips would make a difference, or different air pressures would alter the tire circumference. Maybe cornering would alter individual wheel speed too.

I haven't tried it because my wheels aren't distinctive enough, but maybe I could put a colored sticker on both wheels.

But it's actually more fun to ask the question!

Ken Silver
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~1993 SL500, glistening triple black, xenons: http://www.kensilver.com/SL
~1999 SLK 230 Kompressor, silver /black, CD, immaculate (my wife's)
~1991 Daimler, shiny grey / grey leather, best in country!
~ex 350SL, 230E, 280E, MX5 and a lot of other makes not nearly as nice.