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As a general rule, Tire Rack recommends mounting Track & Competition DOT tires on the widest rim widths approved by the tire manufacturer (up to the widest permitted by the competition class rules).
However, Tire Rack also recognizes that rules for stock, spec or other autocross/racing classes often restrict the rim widths permitted for competition. This has resulted in the evolution of numerous tire and rim width combinations that fall outside those recommended by the tire manufacturer.
While this practice is most frequently requested to accommodate mounting wide R-compound tires on narrower wheels than recommended by the tire manufacturer, there are also instances where competitors want to squeeze wide Extreme Performance Summer tires on narrow wheels, or stretch them onto wide wheels as permitted by competition class rules.
These fitments have been widely employed for dedicated track and competition use previously, but they should not be used on the street, even to drive to and from an event.
Past experience with the tire and rim width combinations that fall outside those recommended by the tire manufacturer shows that tires used in a track/competition environment are maintained better, inspected more often and wear out before they experience long-term issues.
Drivers should always use sufficient inflation pressure and inspect the condition of their tires between runs or track sessions.
Tire Rack will mount tires on wheels outside the tire size's recommended rim width range at the customer's request for competition and track use only.
NOTE: Tire Rack will not knowingly mount or install a wheel & tire package or fitment for street use that is outside the tire manufacturer’s recommended rim width range.
The exception to this is the Original Equipment Manufacturer (OEM) fitments that do so (1969-1982 Corvette, 1995 E36 M3, 2010-2012 Porsche GT3 Rear, etc.).
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