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Old 04-23-2013, 05:28 PM   #1
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Question TT tires

Our new Zinger 33 FK has 225/75R15D tires
Dry weight 8140
Axle weight 6900
tires are rated 2540 ea giving me 10,160
this is going to put me a max I think
what do you think as I am considering upgrading to E rated tire?
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Old 04-23-2013, 08:53 PM   #2
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Upgrading tires from a 15" D at 65 psi to a E tire at 80 psi usually requires a upgrade to a 80 psi rated wheel. There is no advantage of derating a 80 psi tire to 65 psi especially on a trailer.
Most 15" 5 and 6 lug wheels are rated at 2560 lb capacity and 65 psi. although I have seen a few 6 lug 15" wheels rated at 80 psi and 2800 lbs capacity.

If your going to buy new wheels a good upgrade will be to a 16" LT225/75-16 E at 2680 lbs if you have room for the tires in the wheel well.

Another 15" option is a LT215/75-15 D at 2085 (4 =8340 lbs capacity) if it covers your trailers actual loads on the axles.
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Old 04-24-2013, 07:00 AM   #3
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Quote:
Originally Posted by Denlor View Post
Our new Zinger 33 FK has 225/75R15D tires
Quote:
Originally Posted by Denlor View Post
Dry weight 8140
Axle weight 6900
tires are rated 2540 ea giving me 10,160
this is going to put me a max I think
what do you think as I am considering upgrading to E rated tire?

According to the specs for your trailer youíre absolutely right about having marginal tires. Note: The axle weight on the specs is meaningless. Itís the dry weight minus the hitch weight. For actual axle loading check the trailerís certification label found on the LH forward exterior of the trailer. It will give you the trailerís GVWR, GAWR and tire sizes along with their recommended tire pressures. Check your owners manual for any tire recommendations. Many RV trailer manufacturers are now offering optional tire sizes and put that information in the ownerís manuals.

Unless you upgraded your rims I doubt you can use ST225/75R15E tires without having to change the rims for some rated for the increased load and pressure.

ZT33FK - CrossRoads RV
 
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