02-4.8

Rational mass still comes into play. In some cases a lighter bigger wheel can still be harder to turn then a smaller heavier one becuase the weight is farther from a center.

Maybe one of the ME's on the forum could explain it better.

tooquick2beslo

So 12sec5.3 you ran that 12 second quarter mile with 20's ?

Damn...

Scream

iTrader: (6)

My 13.9 @ 101 was on low profile 20s.

TigerFan187

iTrader: (1)

I just take the 20;'s off when its time to go to the track or if I feel froggy I will leave the 16's on for a couple of weeks. I know what if you need to race on the street and you have the 20's on? Thats why I have n20! I drive to and from work during the week and thats it so it works for me! I have Toyo Proxes ST's on now but Im going for the Nittos very soon!

smooth sierra

this is true to a point but the difference is marginal at best. the total weight of the tire/wheel combo seems to be the most important. Let's also not forget what effect tire diameter has on torque.

example: alot of folks like to put taller/wider tires than factory tires on there vehicle. Let's say you put a 33" tall tire on your factory wheel. the combo weighs in at 65# lets say. now someone with a light weight 20" wheel with a 29.5" tall tire and weighs 55# which do you think will put less torque on the brakes and would be easier to turn?

in short overall diameter of the tire is more important than the size of the rim when it comes to torque applied to brakes and acceleration. the reason most folks loose acceleration when going from stock to 20" application is because they usually get either a 275/55/20 (32") or a 285/50/20 (31.5") tire when the stock height is 30". so they are feeling the result of a taller tire not a bigger wheel. the same effect would happen if you went out and bought a 32" tire and put it on your stock wheel.

the 275/45/20 and 265/50/20 are the 2 sizes that come the closest to factory tire height.

12sec.5.3

iTrader: (1)

Ohh No. My truck like it is will never see 12's on 20's. That was on factory rims. I was reading the thread on the radix vs. sts and I'd love to try one out.

SmokinRice

Damn, all these people buyin 18's and I still can't get rid of mine!

BlownChevy

iTrader: (20)

**EDIT** I just asked that question and you are 100% correct. Very interesting stuff if you ask me.

Todd@AZPowerAndSound

iTrader: (1)

To answer with any certainty Id have to do soem Math which I really dont want to do, but theres a few variables here. The biggest issue with the bigger wheels is what was said above. Moving the mass farther from the center of the wheel. If that 55lb 16" wheel was a hideous design and most of the weight was in the center, then it had tiny lil spokes that went to the lip..maybe not. The 20"+ tires are also more reinforced as well so they are generally heavier regardless of overall diameter. This comes in to play with me. My wheels are light 22" 33lbs. But my tires are 45lbs. And all that weight is obviously as far from the center as possible

Bryan TTM

its not blown...most of these guys are searchin for 100ths when they should be lookin for 10ths...just part of the learnin curve bein all caught up in the over-tech psych