Even more tire confusion

[K4BEV]

TT = 2007 Laredo and I want new tires before starting on our 3 week 5,000 mile vacation - Can't wait "bouncey:
Placard on the trailer says tires should be 225/75D 15D @65psi
Rims are 15x6"
Axles are 5080 lb

BUT - The tires on the trailer are Marathon ST225/75R15 Load range D
The spare is a Milestar ST225D/15

So, I need 5 new tires....

BUT - Maxxis ST tires for 6" rims are 205/75 15 D @ 2150 lb
and their 225/75 D tires say min rim size is 7"
:banghead:

What do I really need to put on this trailer?

PS - I did read CW's excellent blog about tires, but I'm still confused........

[JRTJH]

I'm not sure where you got the 7" minimum rim size for Maxxis 22575R15D tires, but on the Maxxis site, the chart indicates 6" rim size.

Check the chart here, both the LR D and LR E tires specify 6" rim width.

http://www.maxxis.com/Industrial/Trailer/M8008-ST-Radial.aspx

[K4BEV]

Thanks! :)
I buy most automotive stuff online from Summit Racing and was using the specs from their site....
They list the same tire (TL15710000) at the Maxxis site but have the rim width wrong.

Problem solved - On to the next prob :cool:

[CWtheMan]

First lets start with tire size. The first D in this size - ST225/75D15D - tells us it is a bias tire and the second D gives us the load range. The R in this size - ST225/75R15D - tells us it’s a LRD radial tire. Both designs have the same load capacity, 2540# at 65 psi.

I would not expect your stock rims to be pressure rated above 70 psi so an upgrade to ST225/75R15E will also require rims rated for the increased load capacity and tire pressure.

The Maxxis tire size charts show both the bias and radial tire fitting 6” rims. Only the radial is made in LRE. The Maxxis M8009 is the bias design tire. It’s a durable tire but not good at all for mileage.

http://www.maxxis.com/Industrial/Trailer/M8008-ST-Radial.aspx

Here are the specs for your trailer. You can use them along with your trailer’s placard information to determine how much load capacity reserves you have for your load conditions. 12 - 15% above GAW is recommended.


http://www.keystonerv.com/previous-years?brand=Laredo&year=2007

Good Luck!

CW

[therink]

On my last fiver (2010 Sydney 329fbh), I upgraded the factory 22575R15 D's for Maxxis 22575R15 E's at 80 psi. The factory 15" aluminum wheels took the 80 psi without problem and I ended up with a much better riding tire. I would recommend looking at that option. Oh yeah, get the tires balanced.
Steve

[michol02]

I just went from Ds to Es on the 32SAB. Hope you're right Therink. Had a blowout on vacation, and the only tires in stock were Carlisles(had to replace 2 because blowout damaged belt on other tire when it blew). Replaced the other 2 this week so they would match.

[jsmith948]

Our 5er came equipped with ST225/75R/15D Towmax tires. The 6" aluminum wheels are rated at 2830 lbs. We are in the process of upgrading to the ST225/75R/15E Maxxis.

[Outbackmel]

My 2011 Outback 329fbh came with 16 inch rims and E rated tires. Been x the US and back, (from Georgia) several trips to Florida, mountain travels, etc. no tire issues. Look new, handle great. I keep them inflated 5 lbs less than max psi BUT do not use fresh water system and always drain before breaking camp.
Carry small 150psi pump from Home Depot and check pressure and lugs daily. Carry a torque wrench. Also, I carry spare in truck bed.
Everyone needs to figure out what works for them and choose what meets their need. My last rv had 7 yr old tires, but, it never was on the road. I put cheap new tires on it to tow to Louisville RV show where I traded it in for a 5er.

[therink]

Outbackmel: I traded on the 329fbh for the 340fbh. Just got it.

[diugo]

I just had an inexplicable failure of the never-before-used Power King Towmax spare I had rotated in after 4000 miles. Verified 65psi before departure---three hours later it was toast. Tire only had 150 miles on it! Fortunately I saw pieces of tread flying off in my mirror, and was able to stop before the tire did any trailer damage.

The other four Towmax ST225/75R15Ds have done fine, so two years from now I'll replace them with Maxxis M8008s. So it makes sense to buy a single M8008 now.

Should I make it the spare, or put it to immediate use by mixing it with the three Towmax (and then make it the spare two years from now)?

And do I really need LRE? The trailer only weighs 9100lb, and 1800 of that is borne by the hitch.

[therink]

If it was me, I would dump the other 3 now and go Maxxis LRE.
Steve

[jsmith948]

X-2!! Just replaced our "D" rated Towmax with "E" rated Maxxis.
When we looked at the Towmax tires off of the wheels it was easy to see that there were several bulges in the sidewalls as well as what appeared to be badly cracked areas below the crown (tire date codes were from early 2011).
:eek:

[diugo]

I see the logic in replacing Towmax with Maxxis---but not the LRE.

My 5er weighs around 9K. LRE provides nearly 12K at the required 80psi. Moving from 65 to 80psi, I would get more protection and better mileage, but at the cost of reduced braking, poorer handling in adverse weather, greater chance of getting stuck in sand or mud, and much harsher ride.

No such thing as a free lunch.