Can ST235/80R16 Tire Be Used as a Spare on 5th Wheel That Has ST235/85R16 Tires
Published 11/06/2014
Question:
Can I use an ST235/80R16 as a spare tire for my 5th wheel trailer that has ST235/85R16 tires? Any problems? Any advantages? This is only for a spare tire. Thanks.
asked by: Chuck
Expert Reply:
Both of the trailer tire sizes you referenced, ST235/80R16 and ST235/85R16, fit the same wheel sizes. Both will fit 16-inch wheels with widths of 6-, 6-1/2-, 7- and 7-1/2-inches. The dimension that differs between these two tires is their overall diameter when they are inflated to their rated pressures.
ST235/80R16 tires will have an overall diameter of approximately 30.9-inches while a fully-inflated ST235/85R16 tire's overall diameter will be approximately 31.6-inches.
The other difference between the two sizes is their load capacity. An E-rated ST235/80R16 tire has a maximum load capacity of 3500-lbs at 90-psi pressure, while an E-rated ST235/85R16 tire has a maximum load rating of 3640-lbs at its 95-psi inflation.
This size difference is acceptable for a short time/distance until you can reach a safe place to have your standard tire repaired (provided that the load rating is adequate) but I do not recommend driving any longer than absolutely necessary with the smaller diameter tire.
You may care to have a look at the linked article on tire sizes.
Product Page this Question was Asked From
Karrier KR18 ST235/85R16 Radial Trailer Tire - Load Range F
- Trailer Tires and Wheels
- Tire Only
- Radial Tire
- Load Range F
- 235/85-16
- 16 Inch
- M - 81 mph
- Kenda
more information >
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