Trailer Tire Replacement/Sizing issue?

[themaestro]

I've done some research on the site about what the best trailer tires are, the problem I have is that my trailer (2003 tandem for 216 AN) has 225/60/15 tires on it currently, and all the tires that are specifically for trailers do not come in that size.

Is it an issue to put regular truck tires on a trailer? I know I see a lot of these trailers running around with fancy rims, what tires are they using? I have a big road trip this summer where I am towing for about 1000mi, so the idea of trailer specific tires gives me peace of mind.

[Quinner]

Guessing those are not original tires, most tandems back in 03' would have been mfr equipped with ST205 or 215/75-14, single axles usually had 15's, ST225/75-15.

Personally don't think having "trailer specific" tires is that important when you have a 3k lb boat on a twin axle trailer assuming they are load capable however I would also imagine trailer specific "should" be the safest most dependable route.

[AirTool]

If you didn't go with trailer specific tires (ST), consider "LT" instead of "P". I'm not sure you'll find LT in that size. You'll have to check the mfg sites.

I've read where P (passenger) rated tires need thier load capability reduced by 15% when used in "LT" (Light Truck) service. I would assume the same applies to real SUV service and even more reduction for Trailer service.

In any case, you will need to verify the load rating as a function of cold tire air pressure from the MFG site.

[NautiUT]

225/60R15 is a performance tire. People were putting them on there trailers for the low profile with a wide foot print. The new 17-20" are perforamce tires as well with a speed rating and a re-enforced side wall. The tow without any side wall sway but hit a pot hole and there goes the wheel if not the tire as well. I perfer the trailer tires. The ST tires should be a 6 ply made for towing. The P series are only 4. Let me know if you have any questions.

[themaestro]

Thanks guys. Looks like I'll have to go with a different size tire if I want to go with ST (trailer) tires. Hopefully it doesn't affect the overall diameter too much, I don't have much clearance beneath the fender.

[NautiUT]

Your 225/60R15 is 25.6 over all diameter. The ST205/75R15 is 27.1. Do you have 1.5" clearance?

[ski4evr]

If you look at the radius as half the diameter, you only need 3/4" additional clearance on the fender for that size.