I did it.
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New User
Joined: Nov 2003
Posts: 4
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From: Minnesota
I did it.
I traded my early build 2003 F350 Lariet CC for a 2006 F350 CC Lariet. The $2500 rebate coupon that Ford sent was what made the deal, hadn't given a thought of trading until I heard about that.
Test drove the truck on saturday and really liked the ride over my old one. One thing I not too sure of is that it has the 20" tires. Is this going to give me to low of final drive ratio when towing? The big tires and wheels sure look good though.
Test drove the truck on saturday and really liked the ride over my old one. One thing I not too sure of is that it has the 20" tires. Is this going to give me to low of final drive ratio when towing? The big tires and wheels sure look good though.
Posting Guru
Joined: Jul 2005
Posts: 1,617
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From: Denver, Co
The rim size has no bearing on speedometer/odometer accuracy, final drive gearing, etc. The tire is what matters, as that is the part that is actually in contact with the ground.
Is the truck new? Are the 20" rims part of a factory tire/rim package or was this part of a dealer installed upgrade?
In a nutshell, rim sizes have no bearing on the final drive ratio. The tire is what is hitting the ground, and that will have some form of impact.
Is the truck new? Are the 20" rims part of a factory tire/rim package or was this part of a dealer installed upgrade?
In a nutshell, rim sizes have no bearing on the final drive ratio. The tire is what is hitting the ground, and that will have some form of impact.
Logistics Pro
Joined: Feb 2000
Posts: 3,955
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From: Mesa
You should have the 275/65R20 size tire. This tire is 34.1" in diameter. Stock F350's come with a 275/70R18 which is 33.1" diameter. So yes, these tires will have some effect on your towing ability compared to a stock F350. Ford has set your computer to this size so there should be no issues there. I doubt you will notice much difference. You may also check your manual. There may be a towing capacity reduction with the 20" wheel option.
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Joined: Oct 2004
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I looked at the 06's with the 20's...You can't get a snow plow package with the 20's and it reduces the payload alittle, but I didn't see where it reduced the towing capacity.
BTW, taller tires will raise your overall gearing making them seem higher not lower.
Let's say you had 3.73 gears and put larger tires on..it might seem like you had 3.55's after the swap..
The lower the number the higher the gear.
BTW, taller tires will raise your overall gearing making them seem higher not lower.
Let's say you had 3.73 gears and put larger tires on..it might seem like you had 3.55's after the swap..
The lower the number the higher the gear.
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Originally Posted by cokeman
C'mon, Jake, you know the answer to that. 275/75R15 is not the same size as 275/75R16.
Super Moderator
Joined: Dec 2005
Posts: 208,487
Likes: 410
From: Omaha/Elkhorn, NE
Congrats on the new '06! Hope you enjoy it as much as I enjoy mine! I have the 20"s also, I think they look great. I'm sure the tires will cost $$$$$ to replace, but hey, you can't take it ($$) with you!
Posting Guru
Joined: Mar 2003
Posts: 1,008
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From: Port St. Lucie, FL
Boy their sure are alot of us with the 20" wheels and tires... 
As far as the speedo I checked mine with my GPS today and it (truck) is dead on with the GPS.
I can not believe how good this new truck rides compared to my 02, 2WD 7.3l
As far as the speedo I checked mine with my GPS today and it (truck) is dead on with the GPS.
I can not believe how good this new truck rides compared to my 02, 2WD 7.3l
Hotshot
Joined: Apr 2004
Posts: 13,589
Likes: 2
From: NW burbs of chicago
Originally Posted by pclark76
Tire circumference (distance around tire) determines final gearing and speed settings, not rim size--that is just a hole in the tire.
Dimensions
<TABLE align=center border=0><TBODY><TR><TD><TABLE align=center border=1><TBODY><TR><TH>Dimension</TH><TH><CODE>Tire A: 275/75 R 15
(31 x 10.83 x 15)</CODE></TH><TH><CODE>Tire B: 275/75 R 16
(32 x 10.83 x 16)</CODE></TH><TH>Difference</TH></TR><TR><TD><TABLE align=center border=0><TBODY><TR><TD>Width</TD></TR><TR><TD>Sidewall height</TD></TR><TR><TD>Overall height</TD></TR><TR><TD>Circumference</TD></TR></TBODY></TABLE></TD><TD><TABLE align=center border=0><TBODY><TR><TD>10.83"</TD><TD>(275.00mm)</TD></TR><TR><TD>8.12"</TD><TD>(206.25mm)</TD></TR><TR><TD>31.24"</TD><TD>(793.50mm)</TD></TR><TR><TD>98.14"</TD><TD>(2492.85mm)</TD></TR></TBODY></TABLE></TD><TD><TABLE align=center border=0><TBODY><TR><TD>10.83"</TD><TD>(275.00mm)</TD></TR><TR><TD>8.12"</TD><TD>(206.25mm)</TD></TR><TR><TD>32.24"</TD><TD>(818.90mm)</TD></TR><TR><TD>101.29"</TD><TD>(2572.65mm)</TD></TR></TD></TR></TBODY></TABLE></TD><TD><TABLE align=center border=0><TBODY><TR><TD>+0.00"</TD><TD>(+0.00mm)</TD></TR><TR><TD>+0.00"</TD><TD>(+0.00mm)</TD></TR><TR><TD>+1.00"</TD><TD>(+25.40mm)</TD></TR><TR><TD>+3.14"</TD><TD>(+79.80mm</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
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