tires n rims - Page 2 - Fiberglass RV


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Old 04-29-2006, 09:30 AM   #15
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Tom,

We have the rim and tire on order, and haven't actually tested them on our trailer yet, sorry that we forgot to mention that important fact. Also, the price is actually $70, a little higher than we remembered. The rim is ordered from Les Schwab Tires - here's the details:
  • product code 03508008
  • product description: 8046034 14X6 5-4.75 Allied Type 80 white spoke rwd
I had a sinking feeling in the middle of the night that the tire on order isn't a trailer-type tire. We just assumed that the tire expert would know that's what we needed... we'll check on that. But here's the current tire details:
  • product code 03101524
  • product description 175/70R-14 84H Merit SE-H all seasons blackwall
We'll post an update as things develop.

Jeanne
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Old 04-29-2006, 06:59 PM   #16
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So, perhaps I wasn't out to lunch - the U-Haul travel trailer size appears to be the 4.75" bolt circle diameter possiblity which I mentioned earlier. Since the 120 mm diameter is only 2/3 of one millimetre smaller, perhaps it really is the "metric" 5-on-120mm size, but 5-on-4.75" still fits okay?

The U-Haul wheels possibly of this pattern which I saw had a large offset (more typical of front-wheel-drive or recent rear-drive than traditional rear-wheel-drive) so I would be careful to check the offset if I were equipping a U-Haul.

Load index 84 (as shown in Jeanne's specs) is good for a capacity of 500 kg (1102 lb) per tire in passenger service, which is 450 kg (992 lb) each after 10% de-rating for trailer service. Since a load index is supplied, and no ST is on the beginning of the designation, I believe that this is a passenger-type tire, but for a 13' trailer the capacity seems more than adequate - especially with the relatively high-speed "H" rating.

I believe that the passenger-type tire is a deliberate and appropriate choice, since to meet the desired diameter with a 14" wheel size requires a lower aspect ratio (70%, in this case) than is available in ST tires.

Jeanne's wheel is six inches wide, which seemed unusually wide to me for a 175 mm tire. For each tire, there are specifications for the minimum and maximum wheel width, as well as the wheel width which is used when measuring the tire. The Les Schwab web page for the Merit SE-H bizarrely gives no size information, but the Goodyear Integrity in that size allows widths of 5.0 to 7.5 inches, and 6.0 inches is the measuring rim width, so my first impression was obviously wrong; the ordered wheel looks like just the right width.

I am somewhat concerned about the accuracy of the Goodyear data, because that page lists the Integrity P175/70R14 84T with a load capacity of 1433 lb at 35 PSI, which would be a load index of 93, not 84. Perhaps it is 93 at low speeds, and 84 at "T" range speeds? Anyway, I think a load index of 84 should be fine. Too bad my twice-as-heavy B1700 is not so easy to fit.
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Old 04-29-2006, 07:06 PM   #17
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The tire portion of the above discussion is similar to the discussion in Auto/Truck tires on 13 ft. Scamp?, Bias or radial?. In that one, Garret chose P195/70R14 tires, which are 20 mm wider and thus about 14 mm (half inch) larger in diameter; I don't think it's an important difference.
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Old 04-30-2006, 10:50 AM   #18
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5-bolt wheels list.

Andrew
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Old 05-06-2006, 07:24 PM   #19
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Quote:
Tom,
We have the rim and tire on order, and haven't actually tested them on our trailer yet... We'll post an update as things develop.
Jeanne
I'm sorry to report that our rim/tire combo didn't work out after all. The rim didn't have a large enough offset, leaving the outer edge of the tire in-line with the outer edge of the fiberglass wheel well, with not enough clearance to keep it from rubbing during travel. I apologize for getting your hopes up Tom, I should have waited to see if our rim/tire combo would really work before posting an answer.

So, we too are still in search of a spare...

Jeanne
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Old 05-06-2006, 08:26 PM   #20
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jeanne, thank you so much, now a question, did the rim fit your Uhaul? the tires on my Uhaul are 7.00-14lt. i'm not sure of the brand right now, put i'll post that up here. And thanks again to everyone
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Old 05-06-2006, 09:12 PM   #21
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The bolt pattern for the new spare rim (5 X 4.75) fit onto our hubs OK, the only problem was that the offset wasn't as pronounced as on our original U-Haul rims (which we believe is about 2 to 2.5 inches positive). The lower offset on the new spare rim resulted in placement of the tire too close to the outside edge of the wheel well, where it had less than 1/2 inch of clearance when the trailer was unloaded. We agreed with the sales representative that the spare tire would rub the outer edge of the fiberglass wheel well when the trailer was loaded and underway. Bummer! We were all disappointed and our search goes on.

So far all of the 5 X 4.75 lug pattern rims that we can find on the various websites are for larger wheel sizes (14", 15", 16", 17" etc.) and the 14" rims only have a moderate offset that will not fit inside the outer portion of the wheel well on our trailer. The 14 in rims will probably work if you can find them with enough positive offset. So we're now looking at our existing 13 in U-Haul oddball rims with a new sense of value, and we are scratching our heads to figure out how to obtain one more for the spare. This search has been quite a learning experience for us, and thanks are due to Brian for making all these tire/rim complexities much more understandable!

Jeanne & Steve
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Old 05-12-2006, 08:43 PM   #22
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TOM, CHECK YOUR E -MAIL. I MAY BE ABALE TO SEND YOU A RIM. I BOUGHT SEVERAL AT AN AUCTION SOME YEARS AGO AND I MAY BE ABALE TO MATCH ONE UP FOR YOU.
YOU MAY HAVE THE RIM FOR FREE, JUST PAY SHIPPING. HOPE I CAN HELP.
WILL SMITH
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Old 05-12-2006, 08:59 PM   #23
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SORRY FOR THE SPELLING IN THE PREVIOUS POST.IT'S LATE AND ONE TOO MANY JOHNNIE WALKERS.
ANYWAY, TAKE YOUR RIM TO A LOCAL TIRE SHOP AND HAVE THEM PUT IT ON THEIR SPIN BALANCER TO MEASURE THE OFFSET, RIM WIDTH, DIAMETER, AND CENTER HOLE DIAMETER. ALSO ASK THEM TO TELL YOU THE LUG PATTERN MEASUREMENT.
GET BACK TO ME VIA E-MAIL.
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Old 05-13-2006, 10:24 AM   #24
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Quote:
I'm not aware of any 5-bolt, 13" wheels off the top of my head.
Hello,
1963 Ford Falcon/Ranchero but it MUST be the V8 model, very hard to find and I don't remember the Bolt Circle.
Rick
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Old 05-17-2006, 11:55 PM   #25
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Our progress so far in finding a spare tire and rim for our 1985 U-Haul 13 ft Camper Trailer...


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Steve measured our existing U-Haul rims and drew up this diagram to help illustrate the dimensions, backspace, and offset. We thought that it might be helpful to someone else trying to find a replacement 13" dia rim for their U-Haul CT.

Our most promising lead came from Bill at Diamond Racing Wheels, an internet rim dealer, who told us that the late model Chevy Corvair had a 5 X 4.75 bolt pattern and 13" dia wheels with a large backspace. Used Corvair rims are available for sale through internet dealers, however the rim we located had a width of 7" compared to our 5 1/2" and the offset was 1 3/16" positive compared to our 1 7/8" positive. So rather than risk ordering the questionable rim and paying for out-of-state shipping costs, we set off to search the salvage yards for a Corvair or other compatible rims (i.e., Chevy II / Nova). We also made a bolt pattern gauge from plywood and 7/16" bolts to help us find the 5 X 4.75 rims in the salvage yards.


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a plywood bolt pattern gauge

At our first salvage yard we DID find a late model Corvair, right out in front! It's good we talked to someone before removing the wheel though, because it turns out that it was the owner's prized car. Bummer!

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the junkyard Corvair

At the second salvage yard we found a late 1960's Rover 2000 TC whose wheel looked like a great match - 13" rims with a large positive offset, but the 5 bolt metric pattern was just a little bit off.


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the Rover 2000TC

We also found many, many compact temporary spare tires at the salvage yard, and many of these were in pretty good shape. Steve realized that despite the small backspace, their narrow widths meant that they would be able to fit on our U-Haul's hub without getting too close to the outer edge of the fiberglass wheel well. One of the larger ones had a universal 10 hole pattern (that accommodates the proper 5 X 4.75 bolt pattern) and it was equipped with a new Goodyear tire. We also discovered that its dimensions are very similar to our original rim. The compact spare has a 23" diameter, and the tire is 5" wide with a 1600 lb. load rating. We took it home and it fits great! Plenty of room to rotate inside the fiberglass wheel well, even when the trailer is loaded. We think that the compact spare will work well in a pinch for short distances in an emergency situation. We're still in pursuit of a real spare tire, but until then we can go camping with our temporary spare!


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our original tire and rim (13 in rim dia, overall dia 24 in)


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our new temporary spare tire and rim (16 in rim dia, overall dia 23 in)


Jeanne and Steve
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originalrim2.jpg   temporaryspare2.jpg  

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Old 05-18-2006, 12:31 AM   #26
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We forgot to ask how your search for a spare is coming Tom... Have you been able to come up with a solution?

Jeanne
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Old 05-18-2006, 07:22 AM   #27
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I understand that the bolt pattern on your hubs are totally unique to U-hail. Are the axles also unique or could you switch out the hubs to accept "normal" rims? Has anyone pulled the hubs and tried replacing them? You probably have, but sometimes people overlook an easy solution.
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Old 05-18-2006, 09:08 AM   #28
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Quote:

I understand that the bolt pattern on your hubs are totally unique to U-hail. Are the axles also unique or could you switch out the hubs to accept "normal" rims? Has anyone pulled the hubs and tried replacing them? You probably have, but sometimes people overlook an easy solution.
The problem has been getting the right combination of four elements - the bolt pattern, rim width and diameter, and enough backspace. Of these, the hardest things to find have been rim width and enough backspace. (The original rims are 5 1/2" wide, and have a backspace of 4 1/2 in.) We did consider changing the hub to a 5 X 4.5 bolt pattern, but I think we would have still had trouble getting a narrow enough rim with enough backspace... Changing the axle would have made life easier, but much more expensive. Plus, both these options mean we suddenly have to buy three new rims/tires instead of just one.

We too would be very interested to hear the details from someone that has switched to a hub with a more common bolt pattern. What part numbers, etc did you use? Did the new setup change the way your U-Haul handles on the road?

Jeanne
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