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Originally Posted by f5fstop
... Speed ratings symbols are not required on light truck tires. Therefore, they probably fall under the R rating which is 206 mph (used for HD truck tires). This would seem logical, since GM caps the top end of all their vehicles about five miles under the tire rating (unless you have a ZO6  )
H rated tires are usually capped at around 125. |
I think you did a typo on the R speed rating...shouldn't it be 106?