185/80 Tires on 13'

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Tue, 08/11/2020 - 14:42
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Mr.T
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185/80 Tires on 13'

Has anyone tried a 185/80R-13 tire on the 13' Scamp?  Particularly interested in the Maxxis M8008 ST and how they worked out?

The original size is 175/80R-13, so this tire is theoretically about 10mm (3/8") wider (3/16" on each side) with an 8mm (5/16") larger radius.  Weight rating at 50 psi is 1480 lbs,  vs 1360 lbs for the 175/80-13 (load range C).

 

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Wed, 08/12/2020 - 11:44
snapoversteer
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no room

I just put a new set of Carlise 175/80 13's on my 5ver. I would worry about tire rubbing on any thing wider, but I have an old axel so it doesn't ride as high as some.  The Carlise cost $65 each and my tire folks also had some coopers for $52 each in the 175/80. Not really much for US company tires. FWIW the speed rating on the Carlise is 81mph!! Load range C

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Wed, 08/12/2020 - 20:12
Mr.T
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Thanks for the input,

Thanks for the input, like that speed rating!

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Wed, 07/28/2021 - 17:57
Mr.T
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Following up on 185/80 tires...

Following up on this, the Maxxis 185's have plenty of clearance.  Have about 1500 miles on them so far.  Lots of 70+ MPH in summer heat.  I put TPMS on the tires, including the spare, and the pressure rise (from heat) on the running tires over the spare is about 3-4 psi.

This may be helpful for driving above 65 MPH, and was hard to find.  The text in the Maxxis website pic below is hard to read, it says:

According to the Tire and Rim Association, the US Tire industry specification authority, inflation pressures and load specifications in general for any ST radial trailer tire without a service description, regardless of manufacturer, are designed and rated for 65 MPH.  However, if the speed is higher than 65 MPH, the pressure and load need to be adjusted according to the following guidelines:  From 66 to 75 MPH -- The tire inflation pressure needs to increase 10 PSI (not to exceed the maximum PSI the tire is rated for) but requires no load adjustment.  From 76 to 85 MPH -- The tire inflation pressure needs to increase 10 PSI (not to exceed the maximum PSI the tire is rated for) and load should be reduced by 10%.

 

 

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