Tires, Tires, Tires - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 03-02-2010, 11:57 AM Thread Starter
 
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Tires, Tires, Tires

I have a set of 315/65/18 on my 2500 with a slight lift. I would like to keep the tire height the same, but I want a narrower tire. They are so wide they really suck in the the snow. Any ideas?
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post #2 of 7 (permalink) Old 03-04-2010, 02:07 PM
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If a 70 wide tire wont fit on the 65 wide rim, your gonna have to get new tires and rims like a 315/70/18 or maybe a 315/75/18 but i dout it if they have a 75wide tire in a 18rim but i could be wrong.

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post #3 of 7 (permalink) Old 03-06-2010, 01:58 PM Thread Starter
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Sorry, they are 325/70/18 and what u just posted went way over my head. The tread pattern measuers 11in wide and i would like something about the same height but narrower. Any ideas?
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post #4 of 7 (permalink) Old 03-06-2010, 02:15 PM
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The best thing I can say is hit a tire shop and talk to the manager or shop professionals. Find out what hes got for sizes...

Up here in Idaho I found that 235/85 R16 is a excellent size for snow. Bit this is way too small for your truck setup... My orignal size was 265/75 R16 just horrid for snow traction.

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post #5 of 7 (permalink) Old 03-06-2010, 06:25 PM
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97' Cummins 2500 Gauges from glowshift (EGT, boost) Fuel pressure gauge from auto-meter. Stage 2 airbox, boost elbow, barrels & plungers turned.Custom fuel plate,Airdog 150gph.AFC mods & 3K GSK.SDX injectors (stage 3 140hp).Drilled wastegate.Converted to a NV4500 with a double disc. Being restored from the ground up


01' Cummins 2500 (dads) with a Hotrod pump,100hp injectors, Fass 150, Edge juice with attitude,also plug and power chip,stage 2 ice box,4 1/2 exgaust pipe,HX40

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post #6 of 7 (permalink) Old 03-07-2010, 12:21 AM
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Another way to look at it...

Measure out the contact patch of your tire. Say your 315's and you'll see that its very wide. But now weight just a single axle.

Now take a narrow tire and do the same thing you find the pound per area is MUCH greater giving you better traction in the snow and allowing you to push down through it.

Like my truck... My tires are 6.5 inches wide and has a contact patch of 7 inches roughly. My combined front axle weight is 4,400 pounds. So a single axle is 2,200 pounds with a total contact patch of 45.5 Sq Inches. Now for my rear tires are the same size of patch but there 2,860 pound combined so 1,430 per axle...

Now compare to your contact patch...

I got to admit when wood hauling season comes I switch back to my Cooper STT 265/75 R16 because the wider face allows a better bite for offroad traction and allows me to skid trees much farther...

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
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Last edited by Mopar1973Man; 03-07-2010 at 12:31 AM.
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post #7 of 7 (permalink) Old 03-08-2010, 12:40 PM
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There are tire size charts that show tread width and loaded radius, several of the tire dealers go to the Rubber Manufacturs Association that lists target dimentions and rim sizes.

IIRC 8R19.5 has the dia, weight capacity and is skinnier.

Sipeing with a 3/8 repeating pattern is good on snowpack, self cleaning blocks on fresh snow and for Ice the retreads with inclusions in the tread work well. This combination is not on the market, the closest is HiTek retreads ( I think they moved from Denver to South Dakota)

Tire sizes are currently mostly sectional width ( sidewall to sidewall ) times aspect ratio ( the second number with a decimal point ) plus 1/2 the rim diameter for rolling radius. Tires are metric and rims usually inch measurement.

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