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I bought new tires, front and rear.

After I got the front tire installed and inflated, I noticed an arrow on the tire sidewall that said "rotation." Naturally it pointed opposite to the way I had installed it.

If I simply turn the wheel around, the rotation will go the right way, but my cyclocomputer magnets will be wrongly located, and my rim markings will be backwards.

I intend to do nothing and leave it as is. Question - will this do harm?
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Usually a rotation arrow relates to the tread pattern more than anything. Your tire will not work as well on wet roads when mounted backwards. The extent of the performance degradation depends on the tread design, but rotation arrows are good things to pay attention to. Falling off your bike will do harm, if my memory is accurate.

Reversing rotation will have no effect on the carcass.

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