Understanding tire wheel weights and their dimensions

[a_ahmed]

First I am going to post the most versatile wheel/tire offset/size calculator I have found to date:

http://www.1000rims.com/rt_specs.jsp

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Well, I thought this thread might be useful to me maybe to others, inquiring about such questions.

Unsprung weight (wheels/tires/suspension) is more important than sprung weight (chassis/the stuff on top heh).

If I am not mistaken 1lbs unsprung is equal to 4lbs sprung weight (or 5) correct me if I'm wrong.

Thus any unsprung weight added has an impact on handling, acceleration, braking, gas milage more than any sprung weight removed.

In which ways would heavier wheels/tires/suspension affect handling for instance, will it have less grip, less traction, (usually more weight means more traction right?) will it just mean less response? Etc... I am curious.

More sprung weight usually means softer/more comfortable ride, but that can be compensated with damper valving right? I wish to understand that more.

For instance running the skyline gts-t 16x6.5+45 (18lbs) wheels with good year eagle f1 gs-d3 (22lbs) that's 40lbs total

However if I run RPF01 18x10.5 +15 (19lbs) with yokohoma advan neova ad07 (29lbs) that will become 48lbs total. 8lbs heavier per corner.

Quite hefty however if im not mistaken:

Shorter sidewall = better response in handling/feel?
Wider tire = More Grip/More Traction?

Overall better for grip and response? I don't know? But still 8lbs per wheel quite a bit... pros outweigh the cons?

Go ahead and tear apart my post I want to learn more hehe

[a_ahmed]

Haha found my old thread, well thought I'd contribute with this :)

https://www.rsracing.com/tech-wheel.html

Lots of VERY useful information!


Also I am soon getting 17x9+17 mb competition wheels and 255/40/17 falken azenis rubber :) Maybe two weeks wait time... I hate waiting...

[sr20goofus]

Haha found my old thread, well thought I'd contribute with this :)

https://www.rsracing.com/tech-wheel.html

Lots of VERY useful information!


Also I am soon getting 17x9+17 mb competition wheels and 255/40/17 falken azenis rubber :) Maybe two weeks wait time... I hate waiting...



how do those wheels fit with coilovers and the stock fenders and such? ll be forced to upgrade to 17's next year for tracking because of tire selections. And i am always concerned with fitment due to body roll, corner speeds and such, i just dont want anything to rub.

[a_ahmed]

well ill have to pull front and rear :) But I know racepar1 runs 255/40/17 on 17x9+15 :P hehe

So his works so shall ours :) Pulled front and rear though. He can post his pix im too lazy to hunt him down lol

Hopefuly I'll have them this monday/tuesday if they are readily available i made the deposit, otherwise, i have to wait but should be hopefully this week at latest next week.

I kind of don't want to install the new wheels/tires until after i install the coilovers/arms/new subframe/etc... just wana do it all at once... but... will see :)

Waiting on SPL to send the arms i am ordering, waiting on def to make the sphericals for the uprights (last bit i really have to wait on) and last but not least richard to send me everything (i paid him for it all except shipping). :)