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Old 02-13-2002, 02:06 AM
SCATTITUDE SCATTITUDE is offline
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Default Dodge RAm wheels

I have a 1998 Dodge Ram 2500 that wil need new tires soon. How does increasing tire height affect fuel economy, power and calibration of the speedometer? I have the oem Michelin's on it now but considering the B F Goodrich all terrain T/A in one or two sizes bigger. Any members using this combo and how would you rate it? Thanks.
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Old 02-21-2002, 01:48 AM
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mcchead mcchead is offline
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I went up to the 285/75r16s and I haven't lost any fuel economy in town. I havn't had it on the highway yet though. It did throw the speedo off by about 10%. I hac the 245/74r16's previously. They fit nicely in the wheel wells and only rub occationally.
I hope to get some 8" rims soon to really take advantage of the width of the tire for asthetics.

hope this helps.
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Old 02-21-2002, 10:21 AM
gthomas gthomas is offline
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I changed my tires up two sizes from the original 245's to 285's and now when the speedo reads 62.5 mph its really doing 65 mph, checked this with my GPS. I never checked the accuracy of the speedo with the 245's so I'm not sure how much this changed everything. This truck has 3.55's and going up two sizes did affect my towing.

GT
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Old 02-21-2002, 11:49 PM
SCATTITUDE SCATTITUDE is offline
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Default Ram wheels

Thanks for the info guys, but I still have some questions. You said it affected your towing, could you tell me how? Also mentioned that the tires rub occasionally, where did they rub? On the body or the frame? My truck has the Mopar molded running boards, could that be a clearance problem?

Thanks guys!
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Old 02-22-2002, 01:31 AM
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mcchead mcchead is offline
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The rubbing is on the black plastic fender liner and sounds like the tires are ripping parts off. It's just the tread rubbing on the curved portion of the plastic at the bottom. No damage has been done just sounds bad. I went ahead and pulled the liner towards the back of the truck with a button head bolt (rounded head) connected to a turnbuckle and a hook from the turnbuckle.
There was a hole in the frame about 6" from the fender and I just used my Leatherman and pushed a hole in the liner and ran the button head bolt through that. I connected the turnbuckle to the hook and the button head and tightned untill I got the right clearence.
I tow a 7'000lb trailer and it just affected the roll from start and on the hill climbs. I also noticed a kind of loss of umpf from the line on part throttle accelerations.
I know the tow stuff isn't very specific, sorry.
I don't remember if I've said or not but I have the 3.55 gears.

Later
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Old 03-02-2002, 08:53 PM
JohnC JohnC is offline
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I went with the Dunlop A/T 285/75/16's. This is a D rated tire and is quiet and gives a pretty good ride. Be aware that all tires of the same rating do not carry the same load capacity. They don't rub at all on my truck and are rated at 3300 lbs each. I found it interesting that the Michelin E rated tire has a capacity of 3042 libs.

As far as throwing the speedo off, The math says 7.25%. If you look at the difference in circumfrence, the 245's are 95.7" while the 285's are 103.1"

As far as height goes, The 245's are 30.5" and the 285's are 32.8"

Revolutions per mile, 245's 662, 285's 614.


A buddy just bought a new Chebby S-10 and at 64 on my truck his was 72.

Mine is a bit more gutless from a stop because the effective rearend ratio becomes a 3.40 , down from 3.55.

I'd like to get some 8" wheels also, I know the 285's are actually pushing it a bit.

A tire that size calls for a 7 to 9 inch wheel. The stock factory units are 6.5.

- john
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