R14 vs R15?

[SummitPond]

Just for curiosity's sake, is there a benefit (other than increased load capacity) of moving from (let's say) a 205/75R14 LRD to a 205/75R15 LRD? It appears the R15 tire will fit an R14 rim, the tire just has a slightly larger diameter.

I would consider a move like when it's the next time to replace the tires as this option wouldn't require an upgrade of the rims to handle an LRE. There's room in the wheel wells to accommodate the additional 1/2 inch for the tire.

[Snoking]

Just for curiosity's sake, is there a benefit (other than increased load capacity) of moving from (let's say) a 205/75R14 LRD to a 205/75R15 LRD? It appears the R15 tire will fit an R14 rim, the tire just has a slightly larger diameter.

I would consider a move like when it's the next time to replace the tires as this option wouldn't require an upgrade of the rims to handle an LRE. There's room in the wheel wells to accommodate the additional 1/2 inch for the tire.

You have the numbers confused. R14 and R15 are rim diameter measurements. The R indicates radial tire BTW. 15" tire will not fit on 14" rims. You could go to a 215/75R14 tire for more capacity on you existing rims. Chris

[SummitPond]

You have the numbers confused. R14 and R15 are rim diameter measurements. The R indicates radial tire BTW. 15" tire will not fit on 14" rims. You could go to a 215/75R14 tire for more capacity on you existing rims. Chris

Oops! Thank you. From the chart I looked at it appeared it was the OD that changed; I guess it was the ID.

[JRTJH]

Just for curiosity's sake, is there a benefit (other than increased load capacity) of moving from (let's say) a 205/75R14 LRD to a 205/75R15 LRD? It appears the R15 tire will fit an R14 rim, the tire just has a slightly larger diameter.

I would consider a move like when it's the next time to replace the tires as this option wouldn't require an upgrade of the rims to handle an LRE. There's room in the wheel wells to accommodate the additional 1/2 inch for the tire.

no, No, NO !!!!!

The 14" tires REQUIRE a 14" rim and the 15" tires require a 15" rim. The 15" tires WILL NOT be safe to use on 14" rims.... You will need to buy new rims of the proper size.

Now, where I think you might have been trying to go.... The 14" and 15" wheels will both fit on the hubs on your axles (if they have the same lug pattern). You won't need to change the hubs, just buy 15" wheels with the same lug pattern as your 14" wheels. All 4 need to be the same size if you do decide to switch from 14" tires to 15" tires.

[SummitPond]

Chart from Carlisle (https://www.carlislebrandtires.com/our-products/product-detail/radial-trail-hd).

This is why I was confused:
6H04561 ST205/75R14 LRD 26.1 7.8 5.5 2040 65 9 81
6H04591 ST205/75R15 LRD 27.1 7.8 5.5 2150 65 9 81

The 4th column is listed as "mounted diameter", the 5th as "mounted width" and the 6th as "rim width". No units are provided, but I assumed inches for those columns (pounds, psi and mm for the remaining columns). I misfigured as columns 5 & 6 were the same then the ID of the tires were, too. Mea culpa!

Unfortunately Carlisle doesn't make an R14 in a larger size; I haven't checked Maxxis or GY yet. Otherwise as you say I'll need differet rims.

Thanks for setting me straight. That's a good thing about asking questions on this forum.

Ken

[JRTJH]

Goodyear Endurance markets a 215 75R14 LRD tire with a weight capacity of 2200 pounds. They will fit your 14" rims (assuming the wheel weight and pressure capacities are met). They are, to my knowledge, the heaviest rated 14" ST tires commercially available to the general public.

https://www.goodyear.com/en-US/tires/endurance/sizes-specs

[CWtheMan]

Chart from Carlisle (https://www.carlislebrandtires.com/our-products/product-detail/radial-trail-hd).

This is why I was confused:
6H04561 ST205/75R14 LRD 26.1 7.8 5.5 2040 65 9 81
6H04591 ST205/75R15 LRD 27.1 7.8 5.5 2150 65 9 81

The 4th column is listed as "mounted diameter", the 5th as "mounted width" and the 6th as "rim width". No units are provided, but I assumed inches for those columns (pounds, psi and mm for the remaining columns). I misfigured as columns 5 & 6 were the same then the ID of the tires were, too. Mea culpa!

Unfortunately Carlisle doesn't make an R14 in a larger size; I haven't checked Maxxis or GY yet. Otherwise as you say I'll need differet rims.

Thanks for setting me straight. That's a good thing about asking questions on this forum.

Ken


Another option for you could be the Kumho 857 European designed trailer tire form Korea. Their designated size 205/R14C has a maximum load capacity of 2271# @ 65 PSI. They do not conform to ST tire load inflation charts for equal sizes. Tire retailers often leave the "C" in the size out of brochures because of the confusion factor. In European sizing the "C" at the end denotes a commercial designed tire. Many of the USA tire retailers carry them in stock. It's a trailer tire with a "Q" speed rating on it's sidewall.

https://tiresize.com/tires/Kumho/Radial-857.htm


The aspect ratio for that tire is 82 vice USA 75.