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Tire Rack Tire Tech Library
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Extensive free guides on tire maintenance, rotation, pressure; frequently linked in Reddit mechanic subs
More resources on Tire Maintenance
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Discount Tire Learn Center
Practical tire care tips from pros, upvoted in r/tires
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NHTSA Tire Safety
Official free U.S. government tire maintenance and safety resources, top rec for basics
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repairpal.com
RepairPal is a car maintenance and repair resource offering maintenance schedules, how-to guides for common issues, and transparent cost estimates, plus access to a network of certified repair shops.