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Posted: 3/24/2013 6:23:44 AM EDT
[#1]
I have 20's on my truck and after installing them I think the mileage went down but it was not by much. I drive mostly in town and not much on the interstate.
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Posted: 3/24/2013 6:26:36 AM EDT
[#2]
Wen I ordered my new truck I decided to go with 17's due to the fact that I would have a better tire selection and cheaper.
I do believe 20" wheels would have a slight mileage decrease |
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Posted: 3/24/2013 6:42:30 AM EDT
[#3]
Plus a rougher ride. I wish I had 17's instead of 20's.
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Posted: 3/24/2013 7:00:25 AM EDT
[#4]
The larger wheels may have more mass, and as a result rob you a bit on power/economy not to mention thinner sidewalls on your tires.
I am looking at 2013/2014 new Fords and someone at Ford has a HUGE fetish for 20"-22" bling bling dubs, or at least someone at marketing has this fetish. This isn't just pickup trucks either. I think it is really stupid because it limits tire choices and ride comfort. But this does improve handling and braking somewhat. |
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Posted: 3/24/2013 7:07:36 AM EDT
[#5]
Given the unsprung weight of thw wheel/tire comlared to that of the truck, any mileage effect will so minor you wont see it. What will effect things greatly is the width of the tire itself, the tread design, and inflation.
Ie, a 255 tire on 20's at 40psi will have better mileage than a 315 on a 17 at 32 psi. Eta: presume correct aspect ratio to give both sets same diameter. |
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Posted: 3/24/2013 7:17:12 AM EDT
[#6]
On my last f250 I had 37's on 20's and I'd say I lost 2-3 MPG's from the stock mileage.
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Posted: 3/24/2013 7:28:54 AM EDT
[#7]
Quoted:
Given the unsprung weight of thw wheel/tire comlared to that of the truck, any mileage effect will so minor you wont see it. What will effect things greatly is the width of the tire itself, the tread design, and inflation. Ie, a 255 tire on 20's at 40psi will have better mileage than a 315 on a 17 at 32 psi. Eta: presume correct aspect ratio to give both sets same diameter. That has not been my experience. The extra weight of the larger wheel was an obvious change in performance that could be both measured and felt. |
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Posted: 3/24/2013 7:44:27 AM EDT
[#8]
Im looking at new and used Dodge 1500 SLT models and just about every one I see at a dealer that has the 5.7 Hemi engine, ALSO has 20 inch alloy wheels.
I like the 5.7 Hemi, but dont really want the 20 inch wheels. I never cared for "bling" 
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Posted: 3/24/2013 7:58:42 AM EDT
[#9]
A larger factory 20" rim vs say a factory 18" rim is actually very close in weight as long as you are maintaining the same height/width tire.
As an example. A Toyota Tundra 18" alloy weights 33.5# A Toyota Tundra 20" alloy weights 37# A Toyo Tire Open Country 18" tire that is 31" tall and 10.9" wide weighs 39.2# A Toyo Tire Open Country 20" tire that is 31" tall and 10.9" wide weighs 39.7# So overall the 18" weighs 72.7# each and a 20" weighs 76.7# So overall you are within 4# per corner if you keep everything equal in this particular case. |
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Posted: 3/24/2013 8:05:00 AM EDT
[#10]
Quoted:
Given the unsprung weight of thw wheel/tire comlared to that of the truck, any mileage effect will so minor you wont see it. What will effect things greatly is the width of the tire itself, the tread design, and inflation. Ie, a 255 tire on 20's at 40psi will have better mileage than a 315 on a 17 at 32 psi. Eta: presume correct aspect ratio to give both sets same diameter. This is incorrect. Adding Rotating mass is theworst thing you can do from a MPG performance standpoint. Its literally horsepower lost and fuel burnt. 20" wheels on trucks are just for looks. They cost more ride and drive like sjit and make your truck slower and more fuel thirsty. But they look teh awesome rolling past the window reflection at the mall food court |
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Posted: 3/24/2013 8:07:04 AM EDT
[#11]
If you plan on keeping the truck through several sets of tires I strongly suggest the smallest wheel you can get. Tires are MUCH cheaper in the smaller rim sizes.
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Posted: 3/24/2013 8:34:00 AM EDT
[#12]
My old Silverado had 20" wheels and averaged 17.6 over 165,000 miles.
My new Silverado has 17" wheels and so far is averaging 16.3 over 1,300 miles. I'm confident the mileage will bump up as I get the highway/woods ratio higher. Tires are going to be cheaper for the 17" rims and my options will be greater. |
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Posted: 3/24/2013 9:03:53 AM EDT
[#13]
Smaller wheels also allow thicker sidewalls. Thicker sidewalls = better ride comfort and better protection from hitting potholes/debris.
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Posted: 3/24/2013 5:11:41 PM EDT
[#14]
Quoted:
If you plan on keeping the truck through several sets of tires I strongly suggest the smallest wheel you can get. Tires are MUCH cheaper in the smaller rim sizes. yep. Fuck 20s on trucks. |
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Posted: 3/25/2013 3:56:16 PM EDT
[#15]
I just removed some milled out Hummer 17x8.5 H2 wheels and Cooper 37x12.50R17s on my truck
I swapped in some BMF 20x10 Sota 8s and 37x13.50R20 Toyo MTs The new setup is 20-25 pounds heavier, per corner No change in fuel mileage and no change in ride quality In fact, I think the Load E range Toyo's feel more solid and stable than the Load D range Coopers |
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Posted: 3/25/2013 7:13:04 PM EDT
[#16]
Quoted:
A larger factory 20" rim vs say a factory 18" rim is actually very close in weight as long as you are maintaining the same height/width tire. As an example. A Toyota Tundra 18" alloy weights 33.5# A Toyota Tundra 20" alloy weights 37# A Toyo Tire Open Country 18" tire that is 31" tall and 10.9" wide weighs 39.2# A Toyo Tire Open Country 20" tire that is 31" tall and 10.9" wide weighs 39.7# So overall the 18" weighs 72.7# each and a 20" weighs 76.7# So overall you are within 4# per corner if you keep everything equal in this particular case. 4 pounds per wheel of unsprung, rotating weight is HUGE. It's not the same as 16 pounds in the trunk. 
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Posted: 3/25/2013 8:31:08 PM EDT
[#17]
Quoted:
Still kinda pondering about a new truck, vs keeping/fixing mine. While shopping for newer ones, alot of them are coming with 20 inch chrome wheels, which isnt really important to me. Im also wondering if there is any significant fuel mileage difference between, say 20 inch wheels and 17 inch. I suspect that the 20's will result in slightly lower fuel mileage.
The difference will be hardly noticeable with a V8 1/2 ton driving around town. |
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Posted: 3/26/2013 5:14:42 AM EDT
[#18]
Quoted:
A larger factory 20" rim vs say a factory 18" rim is actually very close in weight as long as you are maintaining the same height/width tire. Agreed. If you keep the same overall tire size, the difference in weight is negligible. Yes, adding un-sprung weight will rob you of power and fuel mileage, but a 20 inch wheel with the same overall tire size is not going to make a noticeable difference, at least in alloy wheels. Most people go with larger tires when they run 20" wheels, which is why they also see a drop in mileage or power. Quoted:
yep. Fuck 20s on trucks. 20's are the new 16's. Anything smaller looks funny and outdated to me. I remember as 17s and 18s became the unofficial standard for full size pickups, and you'd still see 15's around that looked like golf cart wheels. 16-18" wheel sizes are starting to do the same. Tires are more expensive, but they're not terrible if you buy quality tires. I have Nitto Terra Grapplers which were about $100 more per tire than a similar size on a 17" wheel. I expect to get about 60k miles out of them, so it's an extra $400 every 3 years or so, or about 1/2 a penny extra per mile. Here's my current F-150 with 20s, and my last truck with 16's. Both were 33" tires. The 20's look so much better. 
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Posted: 3/26/2013 6:08:17 AM EDT
[#19]
the rim size does not have any affect on mpg....but the total diameter and weight of the wheel and tire make all the difference. it all depends on what the various wheels weigh and tire brands weigh. how sticky the tire is and how wide will affect mpg also. i have a 2012 tundra rock warrior with 33 inch bfg a/t e load tires and each tire is something like 59lbs each. but i have the forged trd 17 inch wheels and they are only 24 or 26 lbs each. i average the same as most others i talk to with tundras that have 18-20 inch wheels on them. heavier wheels and tires will hurt stopping distance some too.
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Posted: 3/26/2013 11:29:35 AM EDT
[#20]
20's have tires with higher load ratings, better handling characteristics, better heat dissipation, better wear, and tend to be safer in the event of a blow-out. It also allows for much larger brakes. As much as some hate the look, there's no disputing that the trend towards 20's has been a positive one.
ETA: as far as weight goes, what you gain in wheel you lose in tire. I have had 17's, 16's, and 20's on three different trucks; the 20's had the lightest tires and the wheels were comparably light. |
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Posted: 3/26/2013 4:26:51 PM EDT
[#21]
Truck on 37x12.50s on 17s
Truck on 37x13.50s on 20s 
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Posted: 3/26/2013 5:22:20 PM EDT
[#22]
Quoted:4 pounds per wheel of unsprung, rotating weight is HUGE. It's not the same as 16 pounds in the trunk.
On a bike, definately. But would it have the same effect upon a 5000 lb vehicles as it would a 500 lb? Especially on a 4 wheeled vehicle, where the centri forces on the wheel want to keep the wheel upright resisting turn in, are irrelevant? |
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Posted: 3/26/2013 5:25:10 PM EDT
[#23]
Quoted:
Plus a rougher ride. I wish I had 17's instead of 20's. Yup. I have had 20s on my last two trucks. Just put new tires on yesterday actually. 2010 F150 Patinum Edition. It looks good with the 20s but I would drop them for a nice set of 17s in a heartbeat. I will never own another truck with 20" wheels again |
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Posted: 3/26/2013 5:28:17 PM EDT
[#24]
Nevermind , not GD
Need to remember to check when posting off active topics |
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Posted: 4/12/2013 5:40:06 PM EDT
[#25]
My 08 F150 w/22x9" cragar ss (yes old school here) stock was 17",
I have the biggest v8, and a tuner, I commute daily apx 100 miles round trip, I get about 15-17 mph @ 75mph @ 38 lbs of air pressure on Toyo Proxies. The ride is great, stock tires and rims look like crap on this truck.  |
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Posted: 4/12/2013 10:40:22 PM EDT
[#26]
if you plan to go off road then get the smaller wheel.
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Posted: 4/13/2013 6:30:59 AM EDT
[#27]
If you are not radically changing the outside diameter of the assembly, the wheel size can vary greatly. Basically, all you are doing is varying the amount of sidewall you now have. Mileage will remain constant if the treadwith is the same.
If you increase the diameter and the treadwidth, mileage tends to decrease. The tire is the primary shock absorber for your suspension, so decreasing the sidewall with no change to the suspension results in a harsher ride. |
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Posted: 4/13/2013 10:32:22 PM EDT
[#28]
Not a truck, but I know that the EPA rating for the new Mazda 6 is the same with 19's or 17's, so I imagine the difference isn't as huge as people think. Tires themselves are fairly heavy, so the lower profile ones must shave some weight on the sidewall, right?
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Posted: 4/14/2013 6:41:59 AM EDT
[#29]
I bought my truck last summer and ordered it with painted 20's. I get decent mileage, but drive mostly around town. I did upgrade the puny tires to some 285/60/20's, which helped with the look.
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Posted: 4/14/2013 7:17:57 AM EDT
[#30]
All I know is the milage with 19.5" wheels sucks. I'm guessing with 20s it still would ;) |
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