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Cracking in the top surface of the tread blocks or down in the tread grooves?
Top surface, I would just keep and I on it to see if it gets bigger, connected cracks. Down in the tread more of an issue. if the cracks are shallow and not exposing the tire reinforcement to the elements, again monitor it to make sure it doesn't get worse. If the cracks are deep enough to get to the tire reinforcment then probably change them out now.
Does your bike get parked outside all the time? Parked in the shade or in a garage? If parked outside all the time then the sun is degrading the tire material, ozone degradation.
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My $1200 Vulcan, to start from.
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