I had a set of Enkei`s quite a while back that came with a sticker on the face bead of the wheel to mark the spot. The stickers would of course peel right off. I knew what it was used for when they were mounted and used it accordingly. That said, I can see how it can literally be a one use benefit unless you remembered to mark the wheel using the tire spot when changing tires out. Sometimes the dots on the tires don`t make it until it`s time to change tires. Other manufacturers spots can be very difficult to remove from off the rubber. I have a pretty good memory but I suspect many don`t think that far "down the road", literally. You`d also have to be standing over the tire tech`s shoulder to explain what it is you want done.
A lot of tire mounters would think you were nuts if you had them put a crayon stripe on the wheel to match the old tire and then match the new tire to that mark on the wheel. Let`s face it often times the turn over rate on tire techs is high. Just about the time you get one trained to really understand all the nuances of mounting and balancing expensive wheels and tires, they`re moving on to greener pastures. I guess what I`m trying to say here is that it`s understandable that the common practice is to match the valve stem to the tire, that`s something just about everyone can remember.
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