Whats the big deal with 20 inch rims?
05-01-2009, 11:35 PM
#1
RX8 & RX7 owner
Thread Starter
Whats the big deal with 20 inch rims?
This is for everyone having a big deal with my chrome wheel 20's. I just sold my OEMs. As I was shipping them out I recognized that ....
1. The stock 225/45/18 Dunlops weigh 24lbs
2. The stock RX8 18" rim weighs i believe 21 lbs
3. The stock rim+tire diameter is 26 inches
So... 26" diameter 45lbs total wheel weight and thats without air...
1. 20 inch rims w/tires weigh exactly 50 pounds (with air)
2. 26" diameter with 35 tires.
So the wheels must weigh nearly the same, so then I ask Whats The Big Deal?
I plan getting 20" RE30's in formula silver or F1 black chrome, and if not those, then GT30 2 piece. And Im sure weight wont be a problem.
1. The stock 225/45/18 Dunlops weigh 24lbs
2. The stock RX8 18" rim weighs i believe 21 lbs
3. The stock rim+tire diameter is 26 inches
So... 26" diameter 45lbs total wheel weight and thats without air...
1. 20 inch rims w/tires weigh exactly 50 pounds (with air)
2. 26" diameter with 35 tires.
So the wheels must weigh nearly the same, so then I ask Whats The Big Deal?
I plan getting 20" RE30's in formula silver or F1 black chrome, and if not those, then GT30 2 piece. And Im sure weight wont be a problem.
Last edited by ZumnRx8; 05-01-2009 at 11:37 PM.
05-01-2009, 11:42 PM
#3
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If you want 20 inch chrome rims go for it amigo. I think some people have issue with it because it is something that you usually put on more of a luxury car, cruiser, or SUV, not a sports car. Me personally, I have never really liked the looks of chrome wheels.
05-01-2009, 11:44 PM
#4
RX8 & RX7 owner
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what about inertia if friction is about the same for these two wheels? Describe it to me, what you mean, because Inertia by itself explains nothing.
05-01-2009, 11:51 PM
#6
RX8 & RX7 owner
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Ok, I can understand the attack on "chrome", as it may be for more of a luxury car, cruiser or SUV. However nowadays a lot of cars are going VIP, and put chrome 20's on Lexus, S2k, G35, G37s, a lot more imports! Then someone came up with the comment "chrome is too heavy and not for racing", RETARD I said, "VOLKS, ADVANS, RAYS, WORKS, all make Chrome Racing rims from 17"-20", i.e. GT30s, RE30s? Lets just say they if they were 20" all black gloss Volks RE30s would people still have an issue with them being 20's because they are black and not chrome?
05-01-2009, 11:57 PM
#7
RX8 & RX7 owner
Thread Starter
Two objects within the same gravitational field will experience the same acceleration, however, the object with a smaller passive gravitational mass will experience a smaller force (less weight) than the object with a larger passive gravitational mass.
The interesting thing is that, physically, no difference has been found between gravitational and inertial mass.
GOOGLE. BTW.
The interesting thing is that, physically, no difference has been found between gravitational and inertial mass.
GOOGLE. BTW.
05-02-2009, 12:01 AM
#9
RX8 & RX7 owner
Thread Starter
05-02-2009, 12:05 AM
#12
RX8 & RX7 owner
Thread Starter
^all i know is this...for a 1-3 lbs loss per wheel is sometimes not worth buying $2-3k wheels, unless of couse you are planning to buy them for the looks, like myself, then go ahead. Im turing more to VIP styling now. Those are my Plans before SS12.
05-02-2009, 12:09 AM
#14
RX8 & RX7 owner
Thread Starter
look again, i said diameter, weight, width is the same. never the radius, even if we talk radius of the rim what does the tire do?? Doesnt it spin along with the wheel? Total Diamter, width, weight size is what matters when you are talking speedometer differences or acceleration differences.
05-02-2009, 12:09 AM
#15
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I'm in no way a person to turn to for advice on a car but from what I can presume the less tire after a certain point becomes a determent. Let’s use a different vehicle for example, say my 79 Jeep CJ-5. Let’s assume that the complete tire/wheel size is 30” and work from there. With a 18” rim we have some good amount of sidewall that adds a lot of lateral flex. On a 26” rim we have far less sidewall and flex. We also have less impact room for road debris using the larger rim. In a jeep (I would hope) the goal is not so much cornering as for offroading. So the smaller rim with more room to play in the sidewall is an advantage. Too little sidewall and the jeep is pretty much useless offroad.
Now I see this on a smaller scale with the 8. We want less play on the lateral flex of a sidewall so we can feel connected to the road. Too much play and we may as well be driving the jeep through a corner. However, too little sidewall and you lose some of the flex needed to keep the tire in contact with the road. We’d just depend on the tread and compound alone to keep the contact.
Now, as I said, I’m far from an expert but I think we can figure that tires with the same width, weight and diameter should take the same energy to move. From a performance standpoint though, as far as handling, the size of wheel to tire combination makes a difference. Some may actually like a 20” rim over the 18” while others will not.
From a visual perspective it’s all taste. I’m personally not fond of the look of huge rims. I actually thought the stocks were a bit overkill to begin with but they grew on me. I think you are running into more of this than actual performance bias. I’m sure I’ll be corrected shortly though :lol
Anyway, what does it matter as long as you like the look of your car and how it performs?
Now I see this on a smaller scale with the 8. We want less play on the lateral flex of a sidewall so we can feel connected to the road. Too much play and we may as well be driving the jeep through a corner. However, too little sidewall and you lose some of the flex needed to keep the tire in contact with the road. We’d just depend on the tread and compound alone to keep the contact.
Now, as I said, I’m far from an expert but I think we can figure that tires with the same width, weight and diameter should take the same energy to move. From a performance standpoint though, as far as handling, the size of wheel to tire combination makes a difference. Some may actually like a 20” rim over the 18” while others will not.
From a visual perspective it’s all taste. I’m personally not fond of the look of huge rims. I actually thought the stocks were a bit overkill to begin with but they grew on me. I think you are running into more of this than actual performance bias. I’m sure I’ll be corrected shortly though :lol
Anyway, what does it matter as long as you like the look of your car and how it performs?
Last edited by Fencig; 05-02-2009 at 12:47 AM.
05-02-2009, 12:11 AM
#17
RX8 & RX7 owner
Thread Starter
i care.
05-02-2009, 12:27 AM
#21
RX8 & RX7 owner
Thread Starter
.... We want less play on the lateral flex of a sidewall so we can feel connected to the road. Too much play and we may as well be driving the jeep through a corner. However, too little sidewall and you lose some of the flex needed to keep the tire in contact with the road. We’d just depend on the tread and compound alone to keep the contact.
Now, as I said, I’m far from an expert but I think we can figure that tires with the same width, weight and diameter should take the same energy to move. From a performance standpoint though, as far as handling, the size of wheel to tire combination makes a difference.
Now, as I said, I’m far from an expert but I think we can figure that tires with the same width, weight and diameter should take the same energy to move. From a performance standpoint though, as far as handling, the size of wheel to tire combination makes a difference.
Later on a lot of supercar manufacturers followed suit.
Some examples include the:
McLaren F1 with 315/45ZR17
Ferrari F50 with 335/30ZR18
Jaguar XJ220 with 345/35ZR18
Notice that these are all Z rated (150mph+) rated tires. I am running Nitto Neo-Gens (TOYO makes Nitto) 35ZR20. The lower the series profile the more reinforced the sidewall would be i would say, or why would they be more expensive for less tire?
385/15ZR22 ECTAS hold the fastest production tire record speed at 225mph+ a 15 profile tire on a PORSCHE (dunno what model) at Nurburing test facility.
Im going to say it depends on the rating of the tire. And how you said, I think it all depends on what sport (drag, circuit/track, drift, etc.) you are going to be participating in where tire/wheel/tire compound/tire rating combination comes into play...dont you?
Last edited by ZumnRx8; 05-02-2009 at 12:32 AM.
05-02-2009, 12:36 AM
#25
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With Width you add another dimension. If you went with a wider tire you could offset the loss of sidewall flex with sheer contact area. Hence my point of relying on contact and compound after a certain point. I was just trying to keep that dimension out of the picture for now. However, as you also said, it really depends on what you want to do and how the driver wants to do it.
Also to your question on price for lower profile. Yes I imagine they have to make it sturdier but that takes in trade the flex that is needed when making a high lateral g turn.
Also to your question on price for lower profile. Yes I imagine they have to make it sturdier but that takes in trade the flex that is needed when making a high lateral g turn.
Last edited by Fencig; 05-02-2009 at 12:43 AM.