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  #1  
Old 02-12-2008, 05:38 PM
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johngfla johngfla is offline
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20 Inch Tire option on 4X4

Has anyone experienced issues with the Perrelli tires that come as the tire on the 20 inch wheel/tire option on the F150 4 X 4?

I recently picked up my 08 FX4 with this option and have had problems with tire balancing and out of roundness of several of the tires. I'm interested if this is wide spread or if I just got a few bum tires.
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Old 02-12-2008, 06:37 PM
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I haven't had any problems per se, but I know that they lower the tow rating and that they are prone to get flat spots while sitting over night causing the car to have some vibration and harshness when driving the first few miles in the morning. To overcome the "flat spot" harshness inflate to 40 - 45 lbs.
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Old 02-12-2008, 09:40 PM
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Quote:
Originally Posted by bridge
I haven't had any problems per se, but I know that they lower the tow rating and that they are prone to get flat spots while sitting over night causing the car to have some vibration and harshness when driving the first few miles in the morning. To overcome the "flat spot" harshness inflate to 40 - 45 lbs.
Is that condition limited just to Pirrellis or to all 20s? And how much does it lower the tow rating? I'm planing to swap my stock 18s for a set of new 20" takeoffs in Houston in about a month.
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Old 02-12-2008, 10:08 PM
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I've got the 20's on my '06 Screw. Where I live (ND) they do flat spot alot in the colder weather but they even out after a few miles of driving. One thing I do notice is that the rims, due to their width, like to hold snow when you drive through snow banks which will in turn throw your tires out of balance and cause vibration also. I wish I would have stuck with the 18's on my truck since to me it seems that the 20's are wayyy to heavy and take alot of power to turn and don't brake as well. But one thing is for sure they look sweeeeet.
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Old 02-12-2008, 10:12 PM
silver lariat silver lariat is offline
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All interesting stuff. Here in Louisiana and Texas we don't get a lot of snow. Heck I've only seen the stuff maybe half a dozen times in my 55 years of livin'.

I may rethink the swap to 20s and keep my 18s and stock 18" chrome wheels. For the same money I can get the moon roof I've been wanting installed. But the 20s sure do look sweet, you're right about that.
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Old 02-12-2008, 10:16 PM
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Quote:
Originally Posted by silver lariat
Is that condition limited just to Pirrellis or to all 20s? And how much does it lower the tow rating? I'm planing to swap my stock 18s for a set of new 20" takeoffs in Houston in about a month.
According to the manual maximum trailer weight is 500lbs less with 18/20" tires and 3.55 gears than the 17" tires. 7700lbs with 20's vs. 8200lbs with 17's. Makes sense, the 20's have a smaller weaker sidewall.
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Old 02-12-2008, 11:14 PM
silver lariat silver lariat is offline
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Quote:
Originally Posted by bridge
According to the manual maximum trailer weight is 500lbs less with 18/20" tires and 3.55 gears than the 17" tires. 7700lbs with 20's vs. 8200lbs with 17's. Makes sense, the 20's have a smaller weaker sidewall.
Whew! That's no problem for me. My little 6x10 Wells Cargo trailer fully loaded isn't near that weight!
Thanks
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Old 02-13-2008, 07:18 AM
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I have the factory 20 inch rims and I believe they recalled the Pirellis, because I now have cooper discovery's on my truck from the dealership and I have not have a single problem with them
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Old 02-13-2008, 07:18 AM
 
 
 
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