Cooper ST Maxx tires on 06 F350 dually in rear? sucks - Ford Powerstroke Diesel Forum

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post #1 of 6 Old 01-27-2013, 04:00 PM Thread Starter
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Cooper ST Maxx tires on 06 F350 dually in rear? sucks

I replaced nearly balded Cooper Discoverer A/Ts 245/70/17s with
Cooper Discoverer S/T maxx 265/70/17 tires.. They're maybe an inch wider than the factory size 245s were.

The truck since last month, when i had the 4 back tires replaced, is all over the road. I don't mean a little, its nearly impossible to keep the truck tracking in a straight line. It fishtails all the time, 65mph on a dead flat dry highway feels like the tail end is wagging around... empty, loaded.. i won't even attempt to pull a trailer with it!

They're a more aggressive tire than the A/Ts were, but we have an 07 SRW f250 with Goodyear Duratracs which are brand new and just as aggressive and its no where nearly as bad as the dually is.

Anyone else run these tires? Anyone have a dually F350 with mudd tires, or something similarly aggressive?

Is it a rule of thumb they lose all their road holding capabilities with an all terrain tire? I'd assume any mud tire would be worse?

If you drive straight doing 50mph, and turn to the left then the right quickly, like just a little, you feel the back fishtail all over like a car on snow/ice with bald back tires but good front tires.. thats as good of an example as i can explain online.

What could be wrong? Bad tires? Bad choice of all terrains for the back of a dually? The width? I added 1.5" spacers a couple weeks ago and it didnt change anything.

80psi tires, dealer gave it back to me slightly over inflated at 85-90psi... i lowered them all to 75psi and it fishtails all over just like it did at 85+ psi. empty or 5000lbs in the bed it feels the same, just slower to fishtail with weight.

You all know what a truck feels like when spinning the back wheels on snow/rain on the roads... thats what this feels like all the time.


04 F350 XL
06 F350 Lariat SRW BPD oil cooler, ARP, sinister !egr, s&b intake
06 F350 Lariat C/C DRW 4" Silverline , BPD egr cooler, ARP studs, Garett powermax turbo
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post #2 of 6 Old 01-28-2013, 03:47 PM
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Subscribed, as I want to get these for my 08 6.4l this fall. Looking for input....

2008 Ford F-350
6.4L Power Stroke
Crew Cab Long Bed
Buck Stop Bumper w/
WARN 9500 lbs. Winch
H&S Mini Maxx w/ homemade mount
5" Flo-Pro DPB exhaust w/ muffler
Bilstein 5100s Shocks
AFe Stage II Magnum Force Intake
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post #3 of 6 Old 09-09-2014, 07:19 AM
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SAME is happening to me with the EXACT tire
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post #4 of 6 Old 09-09-2014, 07:47 AM
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I have the Fierce Attitudes from Goodyear and love them. No issues what so ever

04 F350 l 6" Pro Comp Lift l American Force 22.5 l PMF Stage 2 traction bars with blocks l Fabtech dual SS l KD Fabworks l 05 conversion l 1Aauto l S&B l MBRP 5" turbo back l WPE up pipes l WPE RR l Holders Diesel 190/75 l KC Turbos stage 2
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post #5 of 6 Old 09-09-2014, 07:53 AM Thread Starter
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we have goodyear Duratracs on a 2007 F250 shortbed in 17s and 18s with same tire on a 2006 F350 long bed... 250 fishtails a tiny bit.. the F350 long bed more, not as extreme as the dually with the Cooper maxx, but similar.


04 F350 XL
06 F350 Lariat SRW BPD oil cooler, ARP, sinister !egr, s&b intake
06 F350 Lariat C/C DRW 4" Silverline , BPD egr cooler, ARP studs, Garett powermax turbo
07 F550 XL c/c 12' ABC american landscaper
11 F350 Lariat C/C !dpf/doc, SCT 7015
14 F550 Lariat C/C Dump truck, !def/dpf, Flo-Pro, T1 Tuner, S&B intake 3200miles
16 F350 Lariat c/c Nov 2015
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post #6 of 6 Old 09-09-2014, 08:00 AM
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Damn, Ive never had mine fish tail at all. And it rains like crazy here in Florida

04 F350 l 6" Pro Comp Lift l American Force 22.5 l PMF Stage 2 traction bars with blocks l Fabtech dual SS l KD Fabworks l 05 conversion l 1Aauto l S&B l MBRP 5" turbo back l WPE up pipes l WPE RR l Holders Diesel 190/75 l KC Turbos stage 2
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