Enkei RPF1 17x7+42 anyone?

[Kido1986]

Everyone has a different number on the effect of sprung to unsprung weight. I most commonly hear between 4 and 8 to 1, not 20:1 (first time I've heard/seen that one)

Has anyone seen scientific proof for a particular ratio?

[Gearhd79]

All i know is that when I had my miata with manual steering , I went from the very light stock rims to a cheap heavy larger rim and the steering felt like garbage. I feel keeping the rolling mass light can only help the way a car feels on the road.

[Philly758]

Oops, i just saw the 100 spacing and assumed there was a 5 in front of it. Good to know the weights are fairly accurate. I'm big into biking and more often than not the manufacturers listed weights are pretty far off.

20:1 does seem a bit extreme. It makes sense that lighter wheels will improve a number of things, but there isn't really a good way to quantify it.

Thanks for the responses.

[Biggins]

Originally Posted by dwx

That's not the same wheel, that's a 4x100 built for other cars.

These 17x7 +42 were pretty much purpose built for the FR-S/BRZ and to maintain legality in the stock Solo2 classes.

They are going to be right around 15lbs give or take a few ounces.

As for the "every pound of unsprung weight" comment, keep in mind they are trying to sell lightweight wheels. There have been a couple tests which show lightweight wheels don't necessarily make the car a lot faster on course, but weight reduction isn't really going to hurt anything

Exactly, and don't forget that tire weight will also show up on a scale.

[Gearhd79]

one thing I learned quick was with my Miata...I had manual steering and went from the 12lb 14" rims to a much heavier fat 15"rim setup that a friend had and the car felt much much heavier in the steering and made the car feel awful till I switched back to a lighter setup.

In my opinion, one should loose as much weight off the rims/tires as possible. :happy0180:

[Kido1986]

Your tire's stickiness plays a big role in wheel feel too. My Konig/RS3 setup is a lot lighter than stock but feels a little heavier because of the adhesion of the wheels versus the prius tires that don't offer any resistance in turning (since their compound isn't sticky)

[Gearhd79]

that makes sence too. I am very curiouse to see just how this car feels when I get the sticky rubber on it.

[Kido1986]

Come to Orlando and you can see what mine does :P

[Gearhd79]

right about now Orlando sounds great...should hit around 18 deg.F overnight

[Kido1986]

Originally Posted by Gearhd79

right about now Orlando sounds great...should hit around 18 deg.F overnight

SCCA autocross this Sunday. Hop a flight and come co-drive!

[Gearhd79]

Haha sounds great but too many responsabilities here. Thanks for the offer though.

[Gearhd79]

Hey people, anyone have any pics of these rims with some 235 40's on it?

[A5D5TRYR]

Originally Posted by Gearhd79

Hey people, anyone have any pics of these rims with some 235 40's on it?

That's what I was thinking about running once my current tires wear out. Realistically they will look about the same as a mounted 225 except they would stick out an additional 5 mm? (Maybe a little less since the tread width isn't quite that straightforward)

[mla163]

Bump.

Are these in stock anywhere? Tirerack said mid-September.