phidauex
Well-Known Member
- First Name
- Sam
- Joined
- Dec 8, 2020
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- Colorado
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- 2021 MachE 4EX, 2006 Prius, 1997 Tacoma
- Occupation
- Renewable Energy Engineer
Theoretically as long as the load rating is higher than the 1/2 of the larger of the two GAWR (gross axle weight rating), then you should be OK. However, manufacturers often seem to up-rate a bit, and I'm not sure what the methodology is for that (more safety factor? Accounting for aggressive driving? I'd be curious if anyone knows for sure).
For the Premium ER/AWD, the ratings are:
Half of the rear GAWR is 1612 lbs. The lowest load rating that exceeds 1612 lbs is "98", so "technically" anything over 98 should work, which may explain the demo cars on 99 rated tires.
That said, everywhere I've read suggests that you respect the OEM's decision on load rating (which on the door sticker is "103H") and not drop below it. But speaking for myself, if I found the tire I wanted and it was one or two steps below the OEM rating, but still well above the calculated rating, I'd feel OK going for it. Just do it eyes open.
For the Premium ER/AWD, the ratings are:
GVWR (Gross Vehicle Weight Rating) | 5800 lbs |
Front GAWR (Gross Axle Weight Rating) | 2660 lbs |
Rear GAWR (Gross Axle Weight Rating) | 3225 lbs |
Half of the rear GAWR is 1612 lbs. The lowest load rating that exceeds 1612 lbs is "98", so "technically" anything over 98 should work, which may explain the demo cars on 99 rated tires.
That said, everywhere I've read suggests that you respect the OEM's decision on load rating (which on the door sticker is "103H") and not drop below it. But speaking for myself, if I found the tire I wanted and it was one or two steps below the OEM rating, but still well above the calculated rating, I'd feel OK going for it. Just do it eyes open.
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