Tire Size
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Mountain Pass
Joined: Aug 2012
Posts: 100
Likes: 4
From: Wisconsin
Tire Size
Good Morning, I have a 2006 F-250 with the 18" wheel option. I bought the truck used. Can I switch to a 17" rim and tire? I dont need the 6 ply load range E tires and would like to get a somewhat nicer ride and thought a 17" 4 ply load range C would help with that. If that will work, what would be the size tire that I could use so my speedo wont be affected?
Thanks for any help.
Thanks for any help.
Token Redneck
Joined: Jun 2007
Posts: 9,335
Likes: 344
From: Breckenridge, TX
Yes you can go to 17s, but no you don't want a C-rated tire. Unless the tire has a 119 or better load rating you won't meet your GAWRs. The highest C-rated tire I've seen was rated at 108, so unless you want to tires overloaded with the truck sitting empty, don't do it. Most guys who want to sacrifice load for ride quality will go with D-rated tires with a 119+ load rating.
Senior User
Joined: Jul 2007
Posts: 377
Likes: 0
From: ct
for what its worth i never got into all that mumbo jumbo^
i just got tires that looked "wicked awesome" and its all good...
doin if for years, last 3 trucks, haul whatever i need, never paid attention to #'s
not to say texas shouldnt be listened to
just my story thasall
i just got tires that looked "wicked awesome" and its all good...
doin if for years, last 3 trucks, haul whatever i need, never paid attention to #'s
not to say texas shouldnt be listened to
just my story thasall
Token Redneck
Joined: Jun 2007
Posts: 9,335
Likes: 344
From: Breckenridge, TX
Different strokes, if I was running bias ply IROKs I'd know not to be pulling goosenecks. Going through a blowout with a trailer will make you find religion in a hurry. FWIW my Nitto Trail Graps are 129 E-rated to 4080# and tow great.
Look at 285/75R17s or 305/70R17s for a stock height truck. They're both right around 34" tall, one is closer to 11" wide and one is closer to 12" wide. Keep the backspacing on the new wheels kind of tight and the 305s won't rub. I clear 295/70R18 (34x12") on stock wheels just fine.
Look at 285/75R17s or 305/70R17s for a stock height truck. They're both right around 34" tall, one is closer to 11" wide and one is closer to 12" wide. Keep the backspacing on the new wheels kind of tight and the 305s won't rub. I clear 295/70R18 (34x12") on stock wheels just fine.
Fleet Mechanic
Joined: Feb 2004
Posts: 1,902
Likes: 9
From: Northern IL
Ya 17's will be fine...but I wouldn't do the C-rated tires....I dont even want to do D-rated tires.
~Gage~
~Gage~
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FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,242
Likes: 758
From: Houston, Texas
You can downsize, but I wouldn't go with load range C tires.
You can get away with load range D as long as they're properly inflated to the max psi and NOT what's on the door jam.
Load range "E" tires are what's best for these trucks as they handle the weight of these vehicles better. You'd much rather over compensate for something than run the thin line of failure/catastrophe.
Safety first!
You can get away with load range D as long as they're properly inflated to the max psi and NOT what's on the door jam.
Load range "E" tires are what's best for these trucks as they handle the weight of these vehicles better. You'd much rather over compensate for something than run the thin line of failure/catastrophe.
Safety first!
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