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Old 06-08-2016, 03:26 PM   #1
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1991 25' Airstream 250
Oxford , Oxfordshire
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Tires to replace stock 7.50R16

My Classic 250 Motorhome came with stock 7.50R16 tires.
Stock weight: 12.300 LB GVWR - Typical actual weight = 12,300 lbs
Wheelbase 178 inch

The Chevvy P30 Motorhome Chassis guide shows the following info as stock tires which matches my 178 inch wheelbase:

six LT215/85FI16C steel belted radials (158 .5 inch wheelbase)
six 7 .50/16LT/D nylon ply blackwalls (178 inch wheelbase)
six 8 .0013/19.5/D steel belted radial blackwalls (190 and 208 inch wheelbases)

7.50 R16s are getting more difficult to find in Europe, so when we left the States, we had some Michelin 235/85 R16s fitted. The reality is that on occaision they almost kissed on the dualies, which isn't tolerable going down the road. So, last year, we finally fitted 215/85 R16s on the rears, but left the wider 235s on the front.

I have a couple of questions:

Are there any potential issues caused by running the 235s on the front and the 215s on the rears?

If I switch to 215s on the front, I can only find them in the 115/112 e.g.Nokian Rotiiva HT in the following load range (115/112 S) which has a weight capacity of 2679lbs on the single axle at 115 - this feels a little light. Are these 215s rated at 2679lbs suitable for the front axle? I've hunted high and low for a higher rating 215 e.g. 120/118, but they aren't available. Any thoughts on whether the 115s are adequate?

If I have 215s all round, it doesn't match the stock tires for the wheelbase, do you think this is an issue?

What are you guys running, especially those with shorter classic Motorhomes?

thanks in advance
Nick

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Nokian Rotiiva HT 215/85 R16 115/112 S M+S
Nokian Rotiiva HT delivers a powerful and comfortable driving experience. Designed for summer use, it’s from our premium-range, guaranteeing the best available spec for the money. It is designed for heavy-duty SUV 4x4 vehicles, and pickup vehicles. It can endure the multiple stresses of various road surfaces and delivers assured handling and grip. A robust, durable tyre can be driven with assurance and can withstand heavy-duty stress.
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Old 06-08-2016, 04:26 PM   #2
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1984 31' Airstream310
Honokaa , Hawaii
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I think that you are fine with what you have. Your rear tires have a slightly smaller diameter than the front, that is all. I have the opposite situation with smaller tires in the front than in the rear, with no issues other than the speedometer is slightly off.
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Old 06-08-2016, 04:36 PM   #3
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1972 31' Sovereign
1975 31' Excella 500
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Benton , Arkansas
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Tires to replace stock 7.50R16

No safety or drivability problems at all.

The only issue I would have is with my six wheel rotation scheme where I often only wear the front tires about half way out and then finish using them up as a paired set on the rear.


Superat stultitia.
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Old 06-09-2016, 09:05 AM   #4
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It's a little confusing - and maybe some additional info would help.

On your 7.50R16LT's (LR D), what inflation pressure is specified?

If what you said is true - that the original tires were Load Range D, then the maximum would be no more than 65 psi. (112/107 at 65 psi), then you could run your LT215/85R16 LR E's (115/112) at 8 psi more than the 7.50R16's and get the same load carrying capacity.
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