1999-2007 Upgrades and Aftermarket - GeneralUpgrading or adding OEM or aftermarket equipment to your 1999-2007 Super Duty. Please confine discussion of topics in this forum to those items that are not engine-specific.
01 with 20" Moto Metals...Stock 18's on newer truck fit?
My 01 has 35x12.50x20 Toyo MT's on 20" Moto Metal rims. I just purchased the truck. It looks good, but i want to drop tire and rim size. Really dont want to shuck out the $$ for 20" tires. Thinking 33's on a stock 18" rim off a newer Super Duty. Aftermarket rims If I must. I've read about issues of wheel backspacing or something on the newer rims. ? is, are there any newer rims that can inner change onto my 99-04 bodystyle, bolt patterns not the same or what?
Or if this combo isnt even possible, shoot me in the right direction.
Thanks
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Last edited by indystroker; 11-25-2009 at 05:33 AM.
'05-up wheels won't work on a '99-'04 SuperDuty because the offset/inset is almost 1.5" different. If you want new wheels, you also want hub centric wheels, and very few hub centric wheels are available. But one good one is the Ultra Wheel Predator 8.
It comes in 18x10, 8 on 170mm bolt pattern, 4.5" backspace, -25" offset, and 125.22mm (4.93") pilot bore, which is hub centric on your hubs. An exact fit for your truck.
LT285/65R18E tires are the smallest that will fit good on that 10" wide rim. Ultra Wheel Predator 8
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Last edited by SmokeyWren; 11-27-2009 at 09:27 PM.
Reason: Oops!
forget that... i haven't and not many other people have had any problems with lug centric wheels like kmcs, moto metals, etc... and the wheels off of a newer super duty (05-07) will fit, they will jus be sucked in a little bit and might rub with a wide tire
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In a nutshell, it means the wheel is centered on the hub by the pilot bore (big hole in the center of the wheel) and not by the lug bolts and tapered lug nuts. The pilot bore is exactly 125.22mm (4.93") diameter, so it fits very tight on the hub. If the pilot bore is bigger, then the wheel is not hub centric.
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How can you tell if the wheel is hub-centric?
The wheel specs should include the diameter of the pilot bore, sometimes called just the bore. Hub centric wheels will be 125.22mm or 4.93 inches. If you have a good caliper measuring tool, then if it's less than 5" it's probably hub centric, but if it's 5" or more, then it's lug centric. The proof of the pudding is when you mount it on the hub, there should be no "play" between the hub and the pilot bore.
You will not find a chassis engineer that agrees it's okay to mount lug centric wheels on your hub centric hubs. Your hubs were not designed to live with the increased stress and strain of a slightly-loose wheel flopping around on the lug bolts.
Last edited by SmokeyWren; 11-27-2009 at 09:25 PM.
SmokeyWren. I just got a set of factory 18" wheels for my truck. Do you know what the tire size was from factory on that wheel. Is it 275/65-18?
Yes, but only on 4x2. F-250 4x4 optional tires and F-350 SRW 4x4 standard tires were LT275/70R18E.
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What is weird is that tire rack shows that wheel only on a 250 and not a 350, I can't see why that would make a difference.
There is no difference. F-250 and F-350 SRW with 18" wheels both have the same wheel specs. The slightly-different tire sizes for 4x4 and 4x2 will both fit the 18"x8" wheels.
Most of the world ignores the "tweener" pickup Ford calls the F-350 SRW. When they think F-350, they think dually. And dually tires and wheels are different than SRW tires and wheels. So maybe that's why TireRack doesn't have the F-350 SRW on their list - it takes the same thing as the comparably-equipped F-250.
If your truck came with stock 16" or 17" rims, then the LT275/65R18 will have about the same revs/mile as your stock-size tires, therefore no change to the speedo/odo/tripmeter calibration. But the LT275/70R18E is quite a bit taller, so it will throw off your speedo/etc. by about 3.8% and give you 3.8% longer legs (taller final drive ratio).
Yes, but only on 4x2. F-250 4x4 optional tires and F-350 SRW 4x4 standard tires were LT275/70R18E.
There is no difference. F-250 and F-350 SRW with 18" wheels both have the same wheel specs. The slightly-different tire sizes for 4x4 and 4x2 will both fit the 18"x8" wheels.
Most of the world ignores the "tweener" pickup Ford calls the F-350 SRW. When they think F-350, they think dually. And dually tires and wheels are different than SRW tires and wheels. So maybe that's why TireRack doesn't have the F-350 SRW on their list - it takes the same thing as the comparably-equipped F-250.
If your truck came with stock 16" or 17" rims, then the LT275/65R18 will have about the same revs/mile as your stock-size tires, therefore no change to the speedo/odo/tripmeter calibration. But the LT275/70R18E is quite a bit taller, so it will throw off your speedo/etc. by about 3.8% and give you 3.8% longer legs (taller final drive ratio).
Thanks. I ordered the 275/65r/18 in load range E. I guess I got the right ones.
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In a nutshell, it means the wheel is centered on the hub by the pilot bore (big hole in the center of the wheel) and not by the lug bolts and tapered lug nuts. The pilot bore is exactly 122.25mm (4.93") diameter, so it fits very tight on the hub. If the pilot bore is bigger, then the wheel is not hub centric.
The wheel specs should include the diameter of the pilot bore, sometimes called just the bore. Hub centric wheels will be 122.25mm or 4.93 inches. If you have a good caliper measuring tool, then if it's less than 5" it's probably hub centric, but if it's 5" or more, then it's lug centric. The proof of the pudding is when you mount it on the hub, there should be no "play" between the hub and the pilot bore.
You will not find a chassis engineer that agrees it's okay to mount lug centric wheels on your hub centric hubs. Your hubs were not designed to live with the increased stress and strain of a slightly-loose wheel flopping around on the lug bolts.
122.25mm is actually 4.81inches. I found some rims I like that are 125mm(4.92 inches). This should still work right? Are the offset and back spacing wrong?
Yeah, you caught me with a brain not working really good. The number is 4.93", which is 125.22mm, not 122.25mm.
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I found some rims I like that are 125mm(4.92 inches). This should still work right?
Ultra wheel says their Nomad with 8-on-170mm hole pattern and 125mm pilot bore will fit a '99-04 Superduty. But if hub centric is 125.22mm, then 125mm is going to be a very tight fit. Ultra also makes the Predator 8, which has 125.22mm pilot bore. The 18x8 comes with perfect specs for your truck. Those should fit for sure if you wanted 18x8 rims.
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Are the offset and back spacing wrong?
I don't know enough about it to declare right or wrong. Ford offset is minus 0.25". That minus 6 raises a red flag, unless it's minus 6 mm, which is close to a quarter inch. Ford doesn't publish backspace, but others have said it's 4.5". So that 4.25" is close enough for Government work. And again, Ultra Wheel says it's for our trucks, so it probably is.
I'm going to contact them on the -6. See if it is 6mm. I like the looks of the Nomads better than the Predator 8, they're a little flashy for me. I think I'm gonna go back to stock size rims and throw some 285's em. The 35's with 20's aren't the best for fuel economy...but man they're cool looking!
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Indystroker
01 F-250 4x4, XLT, Crew Cab,
AFE Stage II Intake
TS Chip w/ PHP Tunes 40HT,80DD,120R,140 Xtreme
Auto Meter Gauges
ITP Fuel Tank/Pre-Pump Kit
Riffraff FRx Crossover
Gutted Turbo
Riffraff SS X-over
DIY CCV
4" Turbo Back w/Donaldson M085171
Warn Hubs
Sonnax Kit
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, 5.6k mod, A.I.H. Delete, IC foil delete, DIY tymar intake, Ranch Hand front bumper, black TSC toolbox, gooseneck hitch, 2 130 watt Pro-Comp spotlights, Prodigy brake controller, smoked '08 taillights 3rd brake lights and cab lights, '02 headlights,... TOTALED!!!
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