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Discussion Starter · #1 ·
I've read endless posts regarding tires and wheels but have had a little bit of trouble tracking down some information specifically geared towards those with 20" wheels. Many of you that have already rid your vehicles of it's factory rims and tires for some beautiful after market 20s and 22s. A good friend of mine had mentioned that it would be a waste of money to spend for 20s if you're trying to fill some of the fender well gap and get an overall larger wheel look. After much research, for those of you that don't go the extra step and lower the vehicle, you will in fact have a larger gap after you install the 20s since the overall tire height is as much as 2 inches smaller when going with 20s opposed to 22s. Only the 22s will give you the larger overall tire look that many look for. You will gain an inch or so with the 22s over the factory 18s.
Factory Tires (300C) 225/60/18 Approx 29" in height
245/45/20 Approx 27"
305/40/22 Approx 31"
 

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bigvrodder said:
I've read endless posts regarding tires and wheels but have had a little bit of trouble tracking down some information specifically geared towards those with 20" wheels. Many of you that have already rid your vehicles of it's factory rims and tires for some beautiful after market 20s and 22s. A good friend of mine had mentioned that it would be a waste of money to spend for 20s if you're trying to fill some of the fender well gap and get an overall larger wheel look. After much research, for those of you that don't go the extra step and lower the vehicle, you will in fact have a larger gap after you install the 20s since the overall tire height is as much as 2 inches smaller when going with 20s opposed to 22s. Only the 22s will give you the larger overall tire look that many look for. You will gain an inch or so with the 22s over the factory 18s.
Factory Tires (300C) 225/60/18 Approx 29" in height
245/45/20 Approx 27"
305/40/22 it all depends om tire size, not rim size to fill the void, besides the upper control arm limits what you can do, i think 30'' is max.................a 20'' with maxed out tire, gives a better ride, than 22'' with maxed out tire..............
 

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Discussion Starter · #3 ·
O Stress said:
bigvrodder said:
I've read endless posts regarding tires and wheels but have had a little bit of trouble tracking down some information specifically geared towards those with 20" wheels. Many of you that have already rid your vehicles of it's factory rims and tires for some beautiful after market 20s and 22s. A good friend of mine had mentioned that it would be a waste of money to spend for 20s if you're trying to fill some of the fender well gap and get an overall larger wheel look. After much research, for those of you that don't go the extra step and lower the vehicle, you will in fact have a larger gap after you install the 20s since the overall tire height is as much as 2 inches smaller when going with 20s opposed to 22s. Only the 22s will give you the larger overall tire look that many look for. You will gain an inch or so with the 22s over the factory 18s.
Factory Tires (300C) 225/60/18 Approx 29" in height
245/45/20 Approx 27"
305/40/22 Approx 31"[/QUit all depends om tire size, not rim size to fill the void, besides the upper control arm limits what you can do, i think 30'' is max.................a 20'' with maxed out tire, gives a better ride, than 22'' with maxed out tire..............
How is it that the rim size fills the void?? The overall height of the tire is the factor not the rim. The rim will certainly distact ones eye but truly the void is filled only after mounting the rim and its rubber.
 

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bigvrodder said:
I've read endless posts regarding tires and wheels but have had a little bit of trouble tracking down some information specifically geared towards those with 20" wheels. Many of you that have already rid your vehicles of it's factory rims and tires for some beautiful after market 20s and 22s. A good friend of mine had mentioned that it would be a waste of money to spend for 20s if you're trying to fill some of the fender well gap and get an overall larger wheel look. After much research, for those of you that don't go the extra step and lower the vehicle, you will in fact have a larger gap after you install the 20s since the overall tire height is as much as 2 inches smaller when going with 20s opposed to 22s. Only the 22s will give you the larger overall tire look that many look for. You will gain an inch or so with the 22s over the factory 18s.
Factory Tires (300C) 225/60/18 Approx 29" in height
245/45/20 Approx 27"
305/40/22 Approx 31"


Your measurements are a little off:

225/60/18 = 28.62"
245/45/20 = 28.68"
305/40/22 = 31.60" (-5.7 mph @ 60mph)

Unless you don't care if your speedometer reads correctly, you must keep the same outside diameter as close as possible. Lower the vehicle if you want to fill some of the fender well gap.
 

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Stock Tire - 225/60R18
Section Width: 8.85 in 225 mm
Rim Diameter: 18 in 457.2 mm
Overall Diameter: 28.62 in 726.94 mm
Sidewall Height: 5.31 in 134.87 mm
Radius: 14.31 in 363.47 mm
Circumference: 89.91 in 2283.7 mm
Revs per Mile: 726.7


Tire 1 - 275/40R20
Section Width: 10.82 in 275 mm
Rim Diameter: 20 in 508 mm
Rim Width Range: 9 - 11 in
Overall Diameter: 28.66 in 727.96 mm
Sidewall Height: 4.33 in 109.98 mm
Radius: 14.33 in 363.98 mm
Circumference: 90.03 in 2286.7 mm
Revs per Mile: 725.7

Speedometer Difference: 0.137% too slow with 275/40/20
Diameter Difference: - Diameter Difference: 0.14%

photo: 275/40/20 on 20x9 iforged (have not found out offset yet) with eibach "pro-kit". The drop I got was 1" after a week & I think it looks good and it sticks to the road like crazy but I have to be A LOT more careful about scraping. No rubbing either but I am working my way through some bent wheel issues. Load force balancing helped but could not get rid of the steering wheel wobble from 65-75mph that appeared after the wheels & springs went on.
 

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steverwrx said:
Your measurements are a little off:

225/60/18 = 28.62"
245/45/20 = 28.68"
305/40/22 = 31.60" (-5.7 mph @ 60mph)

Unless you don't care if your speedometer reads correctly, you must keep the same outside diameter as close as possible. Lower the vehicle if you want to fill some of the fender well gap.
What he said. ;)
 

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hello,

In 20" on a 20x8.5" wheel why don't you use a 255/45/20, it has a high sidewall to take up some fender space?? and keeps you within the ideal rolling radius.

http://www.mhtwheels.com/gallery_vehicle.cfm?brand=2&id=33
(300c on 20" with standard suspension setup)

or in 22" on a 22x9.5" why don't you use 265/30/22, this would look like you fill the fenders more, and have a slightly smaller arch gap....no modifications needed, no speedo correction needed and no problems with lowering.

http://www.mhtwheels.com/gallery_vehicle.cfm?brand=6&id=31

(300c on 22"s with standard suspension setup)

of course then if you want to lower the fender arch gap without lowering you could use 265/35 tyres and stay within a good wheel and tyre rolling radius. Without the need for speedo correction
 
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