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Old 07-25-2016, 05:11 PM   #1
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Maxxis ST tire speed rating

Maxxis website does not provide the speed rating for their ST225/75R15 8 or 10PR TL M8008 tires. I know some of y'all have them and would like to know what yours are rated at.

The last I was told was probably K which is only 68 MPH. I'm hoping they at least tested at L or M. 65 MPH in Texas on interstate will get you hit in the rear.

Thanks.
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Old 07-25-2016, 06:15 PM   #2
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Maxxis ST tire speed rating

This site shows the new MAXXIS rating as Qhttps://www.onlinetires.com/search/vehicle/tires/maxxis/6026/all_prices/all_sizes/all_tires/all_speeds/page_1.html. According to the follow up i see that a Q is 99 mph. I don't have MAXXIS but our new trailer has ST 225 15 Tires and the sidewall has 75 mph on it.
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Old 07-25-2016, 08:16 PM   #3
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I didn't check that site

The official site for Maxxis seems to not want anyone to know. I'll check the one you mentioned if I can get IE to work.

www.maxxis.com will not show speed ratings and mumbles around driving safely.
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Old 07-25-2016, 09:43 PM   #4
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Thanks Retired

I had to restart my computer as Internet Expl. got stupider!

I did check your recommended site and that gives me hope. Checking the Maxxis site, I guess they don't want it spread. This gives me hope along with good reviews by folks here who have Maxxis. Speed rating of 99 is way above what I need, but, good to know.

My present factory tires are the famous Castle Rock from the same supplier that blessed me with light rims / Lions Head. Contacting them several months ago, I could get no response on the pressure rating of the rims.

I am also glad to get the info. on price on the site you provided. Now I can ask Discount Tire why they want so much for the same tire. HMMMM!
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Old 07-26-2016, 10:54 AM   #5
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ST tires without speed letters on their sidewalls or the actual speed rating on the sidewall are rated by the TRA at 65 MPH. Some manufacturers (Goodyear & Power King) have authorized their ST tires to go 75 MPH with a 10 psi increase in inflation above the maximum listed on their sidewalls without an increase in load capacity.However, those tires are made in China and will soon have speed ratings on their sidewalls.
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Old 07-26-2016, 11:48 AM   #6
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Per Amazon, M8008's, 10 and 8 ply have a speed rating "R" which is 106mph, not that anyone would pull that fast....
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Old 07-26-2016, 11:56 AM   #7
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Quote:
Originally Posted by whatsupchuck View Post
...65 MPH in Texas on interstate will get you hit in the rear.

Thanks.
Must be a lot of blind people driving in Texas if they can't see a 5er or TT.
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Old 07-26-2016, 01:27 PM   #8
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It's not the speed rating that governs trailer tow speed. It's the load rating. Maxxis tires are load rate E or less and that means 65mph. Maxxis requires 80psi cold pressure to support even the 65mph. You can increase PSI by 10% to get higher speeds as long as it doesn't exceed the tire manufacturers maximum PSI. Maxxis 8008 E rated have a max psi of 80psi. If you want to go faster, you'll need a tire that has a higher load rating (F and G like Sailun can be found). But keep in mind, your existing wheels may not support the higher pressure required to go to 110psi and it's 110psi that's required to go up to 75mph.

Of course, you can choose to change out both your wheels and your tires as long as your model trailer has enough clearance and as long as the tire you choose has the same or better carry weight capacity.
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Old 07-26-2016, 01:54 PM   #9
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Quote:
Originally Posted by whatsupchuck View Post
I had to restart my computer as Internet Expl. got stupider!

I did check your recommended site and that gives me hope. Checking the Maxxis site, I guess they don't want it spread. This gives me hope along with good reviews by folks here who have Maxxis. Speed rating of 99 is way above what I need, but, good to know.

My present factory tires are the famous Castle Rock from the same supplier that blessed me with light rims / Lions Head. Contacting them several months ago, I could get no response on the pressure rating of the rims.

I am also glad to get the info. on price on the site you provided. Now I can ask Discount Tire why they want so much for the same tire. HMMMM!
I think what you are missing here is that the speed rating is only for test speeds. They are not the recommended speed such as ST which are at 65 mph. Also GY Marathons are the only tire company that I know of that shows that in print that you can go over by adding PSI to the tire. Also they even go as far as to say that the tire still needs to be able to carry the weight. Tire Rack site has a whole page on how they come up with the speed ratings. The only thing per their site says " Well in general, a higher speed rating will result in better car handling" That's on there web site info center under speed rating. From letter "B" to "Z" with the test speeds only not recommended speeds....Speed ratings go from 31mph for "B" to 149mph for "Z" rated......
Attached Files
File Type: pdf Speed Ratings.pdf (538.1 KB, 15 views)
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Old 07-26-2016, 02:07 PM   #10
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I just changed from LRC China Bombs to LRD Maxxis ST225/75R15.

I called Lionshead and they verbally said the rim is okay for it, that is, going up one load range C --> D. I will be running more air but not more weight.

Going from 50psi to 65psi cold max inflation but will probably run at 62psi

Jumping from load range C to E was discouraged from our tire expert on this forum since the rim is rated only for C and running an E rated tire at C air pressure will generate undesirable heat.

O and back to your original question, I followed the speed rating thing and confirmed what you saw there's no specific rating on the tire itself and website is vague. Not sure where Amazon and Online are getting their info. Anywho, recent article published by our forum's tire expert/engineer recently discussed the tire rating test conducted by manufacturer's and it left me thinking it is too static of a test to really rely on.

Whatever the rating is, it could build heat running it at a faster speed continuously.

For me, Maxxis is one of the best ST tires out there, I also went up one load rating, I use a TPMS, and don't speed.
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