Trailer Tire Sizing


8 - 9 - 10 - 12 - Inch Trailer Tire Sizing

Older SizeTire SizeRim WidthLoad RangeOverall Diameter
-4.80/4.00-83-3/4 inch

B: 590 lbs at 60 psi

C: 760 lbs at 90 psi

16.1 inches
-5.70-83-3/4 inch

B: 715 lbs at 50 psi

C: 910 lbs at 75 psi

D: 1,075 lbs at 100 psi

18.1 inches
16.5 x 6.5 - 8165/65-85-3/8 inchC: 800 lbs at 70 psi16.5 inches
18.5 x 8.5 - 8215/60-87 inch

C: 935 lbs at 50 psi

D: 1,165 lbs at 70 psi

18.3 inches
-6.90/6.00-94-1/2 inch

C: 1298 lbs at 60 psi

21.1 inches
-205/50-106 inch

B: 665 lbs at 30 psi

18.3 inches
20.5 x 8 - 10205/65-106 inch

B: 910 lbs at 35 psi

C: 1,100 lbs at 50 psi

D: 1,330 lbs at 70 psi

E: 1,650 lbs at 90 psi

20.5 inches
-4.80-124 inch

B: 785 lbs at 60 psi

C: 990 lbs at 90 psi

20.5 inches
-5.30-124 inch

B: 840 lbs at 55 psi

C: 1,045 lbs at 80 psi

D: 1,250 lbs at 105 psi

21.9 inches
-145/80-124 inch

D: 1,220 lbs at 65 psi

E: 1,520 lbs at 80 psi

21.3 inches




13 - 14 - 15 - 16 - 17.5 Inch Trailer Tire Sizing

Letter SizeMetric SizeRim Width RangeLoad RangeOverall Diameter

A78-13

B78-13

175/80-134-1/2, 5, 5-1/2

B: 1,100 lbs at 35 psi

C: 1,360 lbs at 50 psi

D: 1,610 lbs at 65 psi

24.1 inches

C78-13

D78-13

185/80-134-1/2, 5, 5-1/2

C: 1,480 lbs at 50 psi

D: 1,725 lbs at 65 psi

24.4 inches

F78-14

G78-14

205/75-145, 5-1/2, 6, 6-1/2

B: 1,430 lbs at 35 psi

C: 1,760 lbs at 50 psi

D: 2,100 lbs at 65 psi

26.3 inches

H78-14

J78-14

215/75-145-1/2, 6, 6-1/2, 7 C: 1,870 lbs at 50 psi26.7 inches
-8-14.5MH6 inch

E: 2,540 lbs at 85 psi

G: 3,070 lbs at 116 psi

27.7 inches

F78-15

G78-15

205/75-155, 5-1/2, 6, 6-1/2

B: 1,480 lbs at 35 psi

C: 1,820 lbs at 50 psi

D: 2,150 lbs at 65 psi

27.1 inches

H78-15

J78-15

225/75-155, 6, 6-1/2, 7

C: 2,150 lbs at 50 psi

D: 2,540 lbs at 65 psi

E: 2,961 lbs at 90 psi

28.4 inches
-7.00-15LT5, 5-1/2, 6

E: 2,403 lbs at 70 psi

29.4 inches
-235/80-166, 6-1/2, 7, 7-1/2

D: 3,000 lbs at 65 psi

E: 3,500 lbs at 90 psi

30.9 inches
-235/85-166, 6-1/2, 7, 7-1/2

E: 3,640 lbs at 95 psi

F: 3,960 lbs at 110 psi

31.6 inches
-7.50-16LT6

D: 2,590 lbs at 60 psi

E: 2,926 lbs at 75 psi

F: 3,168 lbs at 85 psi

31.8 inches
-215/75-17.56-3/4 inch

H (single): 4,805 lbs at 123 psi

H (dual): 4,540 lbs at 123 psi

30.2 inches




Questions and Comments about this Article

Diego S.

Hi I own a 3x4 trailer with 4.80-8 tires, and i need new tires is it ok/safe for me to upsize them to 12 inch tires? 103480

Reply from Jon G.

As long as you have enough clearance for them you can upgrade to a larger tire size. We recommend having at least 2" of space from your tire sidewall to the trailer frame and then at least 4" between the tire tread and a fender to account for suspension travel. 75910

David S.

I have a 5000 lbs travel trailer that has ST225/75 15D tires. The chart says this tire this tire is rated at 2540 lbs @ 65 PSI. This trailer has tandem axles so would the load capacity be 2540 X 4 =10160 lbs or 2540 X 2 = 5080 lbs 103474

Reply from Jon G.

The tires add to each other so for your 4 tires the load capacity will be 10,160 lbs. Please note that you are limited by your least rated component so if your axles and/or trailer frame is rated for less then that, you'll want to stick with the lowest rating. 75893

Sara

I have a 04 Dali bumper pull Steel stock Horse trailer I bought used. It came with 225 75R15 on it but now need replacement. Is this a good tire to continue to use on a horse trailer that I use weekly for shows up to 2hrs hauling 2, 1000pound horses. Thank you in advance. 103088

Reply from Jon G.

It kind of depends on how much the trailer and horses weigh together, but something like the Goodyear Endurance # 724857519A rated for 2,830 lbs at 80 psi should be able to. Just remember that the weight rating is increased for each tire used so for a 1 axle trailer using this tire they could handle up to 5,660 lbs combined. 75692

Reply from Sara

@JonG this is a double axle trailer 75766

Reply from Jon G.

@Sara In that case you're looking at 11,320 lbs for 4 of them combined. Just be sure that you don't exceed the lowest rated component in your setup, whether it's your axles, tires, or trailer frame (GVWR) and you'll be just fine. 75770

Austin

I have trailer tires that have 7-14.5 on the sidewall. I am looking to get a spare for the trailer. What size range of tires should work as a spare? 102817

Reply from Jon G.

You definitely want to go with a 7-14.5 size tire because any other size will cause your tires to show inconsistent wear and could cause other problems like to your suspension. We don't have any 7-14.5 tires (and they aren't as common anymore) so if you can't find this tire the safest thing to do is to swap out all of your tires so they all match. 75584

Reply from Beverleigh R.

@JonG I am currently dealing with the same exact problem and tire size. Do you have any recommendations on a rim and tire that would be safe and compatible with a 7-14.5 mobile home tire? 75736

Reply from Jon G.

@BeverleighR While we don't have any 7-14.5 size tires we do have some 14.5" rims. Part # AM20308 is 6" wide and has a 6 on 5-1/2" bolt pattern while part # AM20320 is 7" wide and has an 8 on 6-1/2" bolt pattern. You'll basically want to get the right bolt pattern and then check out the specs on that product page to make sure that it matches your application. 75741

Jon

I have a 1973 Holiday Rambler trailer. Looks like original tires! They have 8.55-15S on the side wall. What replacement do you recommend? Thank you. 102379

Reply from Jon G.

For your application you need a 225/75-15 size tire. I recommend using the Contender # C22515E as it's one of the best tires we have in this size. 75362

Charlie

I have trailer tires need replacing they are FIRESTONE Deluxe Champion G78-14ST. Can you tell me the equivalent to that tire size in a radial . Thanks 102230

Reply from Jon G.

The tire size you're looking for is 205/75-14. I highly recommend the Goodyear Endurance # 724864519 because it is one of the best performing tires that we have to offer. Just be sure that the weight rating of 2,040 lbs at 65 psi works out for your application! 75307

Reply from Charlie

@JonG Thx so much for your reply . 75309

Solomon

We have lowbeds. The tires fitted on the tractor are 12*24 and the tires on the trailer are 12*20. Will it make any problem on the tractor, trailer or on the load if it couple these two? 102146

Reply from Jon G.

I believe what you're asking is if the tires on your tractor and the trailer have to be the same? The answer to that would be no. Just make sure that you aren't overloading your tractor or trailer, and that you're able to tow your trailer with it being level and you're good to go! 75279

Brad

1969 Barth trailer 22ft long double axle had 4, 7.0x15 tires (28.3”tall). I have some 18” truck wheels that will fit. What size tire is best? 225/60/18 LT tire & (28.6” tall) 102062

Reply from Jon G.

You definitely want to go with tires that have similar dimensions. Your 7.00-15 should actually have a 7.7" section width and an outer diameter of 29.3" like what we have with the Kenda tire # AM10412 or # AM10414 . We don't recommend using truck tires for trailers because they have a different construction. The tires I mentioned above are labeled as "light truck" but since the LT is at the end of the size it means that they were designed for trailers. 75211

Reply from Jon

@JonG I now have 18” wheels. So I should get 225 65 18 to match the 29.3 height? This trailer will only be used for fun locally on our property. Rarely driven at most 1-2 hours away a few times a year. 75214

Reply from Jon G.

We just say to make sure you have at least 4" of clearance between the top of the tire and your fender to account for suspension travel and then at least 2" from the trailer frame to the sidewall of your tire. Trying to match you current tire dimensions is a good way to go if you know that your current tires have the proper amount of clearances. 75227

Nancy

Hi I have a 1969 Scotsman 12ft Travel trailer and need to know what size tires I need for it, can you help me? 102029

Reply from Jon G.

I wish that we had a list of exact replacement parts for trailers but unfortunately we don't. Do you know what tires were recently on it? 75210

Mari J.

Hello, I have a 1958 siesta trailer that needs tires and I don't know what size to get. The tires that are on it is very old and the numbers appear to be 7:35-15 Can you help? 101920

Reply from Jon G.

The correct replacement for your 7.35-15 size tire is a 205/70-15. The closest we have to this is 205/75-15 which will have the same width but a little less than 1" larger diameter. Here is a link to our selection of these tires as well as the various tire/wheel combos in this size. 75157

Nick

Hi I have a trailer wheel 5.5 stud with a tyre size of 5.20 - 13. What normal size tyre can I put on the rim 101687

Reply from Jon G.

It looks like your 5.20-13 tire has an overall diameter of 23.10 inches and a section width of 6 inches. The closest thing that we have is a 175/80-13 size tire which will have an overall diameter of 24.10 inches and a section width of 7 inches. As long as this allows you to have about 4 inches of clearance from the top of the tire to your fender, and at least 2 inches of clearance from the sidewall of the tire to your trailer frame you will be good to go. Attached is a link to our selection of tires (and some wheels) in this size. None of the wheels have a 5 on 5 inch bolt pattern so you'll have to supply that part on your end. 75042

John

I have a 5 x 10 homemade trailer w H 78 15 tires on it will a 8 ply st 225 75 15 work ? 101545

Reply from Jon G.

Yes, 225/75-15 is the size tire you're wanting. Just make sure that your tire weight rating is at least as much as your axle and you're good to go! 74959

Reply from John

Thank you Yes I believe the load range is D 74977

Mel K.

Hello, I'm trying to figure out what tires and wheels I need for a odd trailer that has a sun room type building on it ( mostly glass) it's sitting behind a house I purchased and I want to move it. I have the axles and springs in place and need to purchase the spring bolts somewhere and decide what tires to use, its a double axle with 30" between spring bolts, the bolt pattern on the hub is 4.25 from lug to lug. There;s about 8.5" distance from the spring bolt to the bottom of the trailer frame. 98225

Reply from Jon G.

What is the distance from the center of your hub to the trailer frame? It sounds like you have a 5 on 4-1/2" bolt pattern. You can confirm this with the attached article. Typically the bolts used to attach the leaf spring to the hangers has a 9/16" diameter so a wet bolt like part # 126B2 can be used. You'll need to confirm this on your end though. 73100

Reply from Mel K.

@JonG sorry just got back in town, this frame has a unique structure on it (is it possible to send a picture?) Not sure on the wheel diameter and tire size, yes it is 5 lug, . 73398

Reply from Mel K.

@MelK I measured the 5 lugs again and sure looks like 4.25 from lug to lug. The distance from hub to bottom of trailer frame is 16" but the building on the frame drops down 3" and it looks like the tires will hit, so from the center hub to the structure its 13" From face of the hub out there is 3.5" clearance and from face of hub to the frame there is 5.5" clearance. Do all the 9/16 bolts come with a grease fitting? 73456

Reply from Jon G.

@MelK If it really is 4.25" then I'm afraid we won't have any rims that are compatible. As far as tires go I think your best bet is the Taskmaster 4.80R12 Radial Trailer Tire - Load Range C (990 lbs at 90 psi) # TT48012C , but you'll want to make sure that 990 lbs (per tire) is enough capacity for your trailer. You basically just want to make sure that your combined tire rating is at least as much as your axles. It varies if the wet bolt actually comes with the grease (zerk) fitting. Here is a link to our selection of 9/16" bolts that you can filter through. 73571

Quade

I have a 1991 Excel 5th wheel 29 foot. But someone put vehicle tires on it. I need to figure out what size tires it supposed to have 98180

Reply from Jon G.

Look for a sticker either on the frame, in a compartment, or elsewhere on the RV. Sometimes there will be a sticker that shows what size tires the RV should have. If the tires right now don't have a clearance issue you can let me know what size they are and I can tell you what the equivalent would be for trailer tires. 73099

Bill

I currently run 225 75R15 tires I want a little taller tire to improve ground clearance .... I’m looking at new axles but thought I’d try the tire route first if possible 98105

Reply from Jon G.

You'll get a little bit of ground clearance with larger tires but you really won't see that much of a difference. Your 225/75R15 tires have a diameter of 28.4" and even if you installed 235/85-16 tires which have a larger diameter of 31.6" you're really only gaining half of that in height. So you're looking at an increase of about 1.5". You'll see the most increase by using an over-under kit like part # K71-385-00 or by installing taller hangers. 73098

Ray

Can I put 13 inch tires on my 8 ft trailer instead of the 12 inch going to FLA pulling my golf cart 97304

Reply from Jon G.

As long as you can have 4" of clearance between your tire and the fender as well as 2" of clearance between your tire and the trailer frame you can definitely upgrade the tire size. Here is a link that I think you'll find helpful. 72734

Jt

I bought a utility trailer with ST205/75/15 tires. I am an inch to tall to back the trailer into my garage (with a UTV on it) and was wondering if its possible to put on smaller tires (maybe a size 13) to save a few inches? This assumes the load rating supports it. 97216

Reply from Jon G.

Yeah it's definitely possible as long as the load rating supports it like you said. I'd go with a 185/80-13 like the Kenda Karrier # AM10208 which is rated for 1,710 lbs at 65 psi. 72733

Robert M.

Can I change my 14inch to 15 inch rims and tires on a star craft ar one 17 rd year 2016. I want a load range e tire. Thanks 96462

Reply from Jon G.

As long as you can retain about 4" of height clearance between the tire and fender and then at least 2" of clearance from the sidewall to your trailer frame you are good to go. 70797

Shane N.

Trying to determine the right size tires for a 2013 Gulf Stream Conquest 323 TBR that I just bought. 95794

Reply from Jon G.

I wasn't able to find anything either. I'd try reaching out to Gulf Stream Coach with your VIN as they should be able to tell you what came on your trailer. 70796

Chris

What rim size is recommended for a 16’ tandem axle utility trailer. 95363

Reply from Chris R.

This is really dependent on the actual loaded weight of the trailer, along with what kind of clearance you actually have available below the fenders. Do you know what size is currently used on the trailer? 70413

Gary H.

Have a boat trailer withe 2 tires size 185/70R13, must be a discontinue size, what is the closest size tire they may be a little smaller but not bigger because of fender, needing a spare. 95249

Reply from Chris R.

The closest alternative to that size we have available is an ST185/80-13 like the Kenda # AM10208 . This will be just a tad larger than what you currently have, but only by 1/2". That means the new tire will creep closer to the fender by just 1/4". 70412

Reply from Gary H.

@ChrisR Found a plate on boat trailer that calls for P175/80B13, should I change both tires to that size and just keep old tires for spares. 70458

Reply from Jon G.

As long as the 175/80-13 tires have enough weight capacity to handle the trailer then go for it (see attached link). I only recommend using a different sized spare to hobble along a mile or so to your next exit. It would be best to have all of your tires the same size that way if you have to swap one out you can continue on your travel until you can find a tire shop. 70795

Joey

I need new wheels(rims/tire) for a homemade trailer. The tire size is 205/75R15 The hub is a 5 lug 4-1/2 but the center hub hole is only 2-1/2 inches across, Do you have any wheels that will fit this. I do not see a way to filter by hub/pilot size. All the ones I see are 3.19 inches or larger. 94404

Reply from Chris R.

All of our wheels are lug-centric (which is almost always the case with trailer wheels), which means they center and secure to the hub using the lugs - not the hub itself. That's a long-ish way of saying the pilot hole diameter doesn't matter. I've linked our full selection of radial ply 205/75R15 tire/wheel combos below. 69935

Jimmy

I just bought a 1998 sportsman camper trailer 26 ft and wieght 4500 with dual axal its a bumperpull it has 4 diffrent size tires on it i would like to know what it the actuall manufacturer size to go on it i cant find anything on google searchs untill i found this site hopefully. Yall can help thanks 86546

Reply from Chris R.

Unfortunately there's no way for me to verify what the factory/stock tire size was for your 1998 Sportsman trailer, though you will definitely want to change out the tires so that they are the same ASAP. I might just match to the largest tire size you currently have mounted to ensure sufficient weight capacity. 68322

Udo M.

I have a trailer with 5 on 4 1/2" and 12" Mickie mouse wheels. I need to go larger not for the load 1 (Motorcycle ) but for the tow vehicular. I like to go with 14-15 " wheels. To see what will fit, I need the backspacing (offset) for the 14"x 6" wheel and 15"x 6" 86399

Reply from Chris R.

Are you looking at a particular model wheel? Most of the wheels we have available have a zero offset, which is pretty standard for trailers. 68321

Reply from Udo M.

@ChrisR 0 offset means there have the bolting surface in the center. If this is the case I can figure out what I need. Need to take some measurements. 68337

Danny

I have just bought a 2017 RAM 3500 to replace my 2013 F150 EcoBoost to pull my fifth Wheel and I may have to raise the trailer up a few inches. I was thinking about getting the taller tires first But I cant find a suitable tire to replace the ST225/75/R15's. Any suggestions besides investing in 16 inch rims? I only have 4" clearance for upward travel in the wheel wells and 4.5" between tires. The axle is already under the leaf springs! I appreciate your help, Danny 86152

Reply from Chris R.

Taller tires will increase the trailer height a bit, but the problem is that you'd have to get significantly larger tires to really make a difference - and it doesn't sound like you really have the fender clearance to make that possible. To raise the trailer 3" just from new tires would require tires that are 6" larger in diameter/height than what you currently have (since half of the tire sits above the axle). My best recommendation for raising the trailer would be to simply cut off your current hangers and replace them with longer ones. I've linked our full selection below. 67915

Steve S.

my current pop up has a 20.5x8-10 tires which I believe is a 5 x 4.5 bolt pattern. I have heard radials are much better and a smoother ride. Is it possible to upgrade to radials and what sizes would I be looking for? 84805

Reply from Chris R.

A radial ply tire is definitely a better option, especially when it comes to highway travel. In your existing tire size we only have bias units available, but if you upgrade a bit you could go with a 145/80R12 like the Kenda # AM31202 . This tire/wheel will be about an inch larger in diameter/height but around 2.7" smaller in width. It features a maximum load of 1,220 lbs at 65 psi. 67913

George C.

currently have goodyear 195/75r14 on utility trailer what is an inexpensive replacement? 82138

Reply from Chris R.

The closest trailer tire size we have available to that is a 205/75R14, which will be a little under an inch larger in diameter/height than your existing tires. The Contender # C20514C is an excellent, economical option. It features a max load of 1,760 lbs at 50 psi and an 81 mph speed rating. 67278

Jeff B.

I have a trailer that was built on an axle (home made) and the tires are 245/50 R16. Could you recommend a trailer tire size that would work? 82002

Reply from Chris R.

The smallest 16" trailer tire size we have is a 235/80R16 like the Prodivder # TTWTRTM2358016E . This tire will have an overall diameter/height of around 30.7" and a width of 9.25". 67277

Hunter L.

My camper has 7.00-15LT tires and I'm having trouble finding a replacement size, it needs to be really close to the same size so I dont have to flip the axles under the springs to make sure it doesnt sit too low, thank you for the help in advance. 81891

Reply from Chris R.

We have that exact size available. I highly recommend the Kenda # AM10414 , which features a maximum load of 2,403 lbs at 70 psi. 67276

Tony S.

My old trailer PRYOR 1988 has st205/75d14 needs tires replacement, can you advice a good and cheap replacement tires. 80761

Reply from Chris R.

The Contender # C20514C is a high-quality, cost-efficient unit that will work perfectly as a replacement on your PRYOR trailer. It features a maximum load of 1,760 lbs at 50 psi and an excellent 81 mph speed rating. 66505

Raven D.

Just acquired an old EZ Haul trailer. Numbers on the tires are 8 15 15. No letters. I did not find this on the chart. Does anyone know what size tires I should be looking for? 80552

Reply from Chris R.

I've not heard of that tire size listing before. Are there by chance any other numbers printed anywhere else on the tire's side wall? 66265

Mike B.

Will a 14" tire and rim fit under my fenders on a Kar Kaddy? I currently have 13". 80398

Reply from Chris R.

It depends on how much fender clearance you currently have available with the 13" tires. The Kar Kaddy dollies we have in stock actually come with 14" units attached, so I'm thinking you'd be okay but I definitely recommend checking to be sure. We recommend maintaining at least around 4-1/2" of space between the top of the tire and fender. The smallest size 14" tire/wheel we have available, a 205/75-14 like the Kenda # AM32156 , has an overall diameter/height of 26.3". 66264

Taryn R.

I have a trailer with tires sized 175/70/14 84T but I think I need something that is higher loadbearing, what size will fit the wheel? 77366

Reply from Chris R.

A 175/70-14 tire size isn't too common on a trailer. A close alternative that will fit your existing rims and hopefully offer a higher load capacity (I'm not sure what your existing tires are rated for) is a 205/75R14 like the Kenda Karrier # AM10235 , which features a 2,200 pound limit at 75 psi. This will be just over 2" larger in diameter than your current tires. 63009

Tammy

What is a different size tire that could be used to replace an a 8 x 14.5 ply 14 tire for a mobile home trailer? 75831

Reply from Chris R.

The only tire we have available that will fit your existing 14.5" wheel is the same 8-14.5 unit like the Kenda K39 # AM10321 . Any other size would require you to change wheels as well. If you're okay with this, an ST205/75R15 size like the Provider # A15R6WSD would be really close to what you have. This would be smaller in diameter/height by just over a half inch and the width is essentially the same. 61962

Tresa S.

What is 2 sizes up from 4.80-8 75817

Reply from Chris R.

We only have one 8" tire size larger than your existing 4.80-8 unit, and that is with a 5.70-8 like the Kenda # AM10013 . This tire size features an overall diameter/height of 18" (compared to 16.1" on your existing tire) and a width of 5.8" (compared to 4.6"). Anything larger would require a new wheel as well. 61961

Phillip

Old 10.00 x15 lowboy tire what is diameter need tire size for 17.5 Dayton wheel 70097

Reply from Chris R.

A 10.00-15 size tire will have an overall diameter of around 36" and a width of 10.8". It's designed to fit 15" x 7.5" wheels so it's not going to work on your 17.5" rim. For this size wheel you will need something like the Provider 215/75R17.5 # TTWP15175 , which has a 30.2" diameter and a width of 8.31". 57151



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