CU2 Wheels size for performance.

[MKI4EVA]

It's a case of be carefull what you wish for. I'm sure all of us through the years have wanted car manufactures to fit larger wheels as a standar item.

These days I think that's gone too far to some extent. As good as they look I'd much prefer wheels size and design that kept the performance focus.

anyhow to get to the point.......I'm considering down sizing our luxury wheels once we pick up our car in Jan.

just wanted to get a guage as to what ppl thought about doing this. keeping in mind 17"s is probably the lowest i'd go.......

if anyone has pics of 17's on a cu2 please post.

cheers.

[CU2 Euro 09]

Well I upsized the wheels on my standard CU2 from the 17's to 18's. Trying to get rid of 5 standard wheels now.

[albii]

Well I upsized the wheels on my standard CU2 from the 17's to 18's. Trying to get rid of 5 standard wheels now.

Pics my fellow brisbaner.

[zeke]

MKI4EVA ,Give me a yell if you going to sell the 18" lux wheels.

[aaronng]

It is not the rim size that determines performance, but the rolling diameter of the tyre and the rim + tyre weight.

If you go for 17" which is heavier than your 18" and maintain the same stock rolling diameter in order to preserve your speedometer accuracy, then you lose performance because of the additional rotational mass which causes slower acceleration.

[taccord12]

^ what aarong said, and also at the end of the day, whether it is 17, 18, 19 or 20, there's hardly any "real" performance difference in a CU2 anyways. unless you're like that russian guy on the acurazine forum that supercharged his CU2 to 320+ hp atw.

[MKI4EVA]

for the purposes of this thread being informative to those who've looked, anyone weight their stock 17 and 18" CU2 standard wheels?

[taccord12]

for the purposes of this thread being informative to those who've looked, anyone weight their stock 17 and 18" CU2 standard wheels?

i've weighted my 18" with tyres, they're about 23KG each

[MKI4EVA]

i've weighted my 18" with tyres, they're about 23KG each

sweet.............now you just need someone whos got a 17" lying around to wack on the scales.

[denot]

i've weighted my 18" with tyres, they're about 23KG each

man, thats the same with FD2's 16" rims!!!

[taccord12]

yeah man, pretty damn heavy -_-

[CU2 Euro 09]

I'd weigh my standard 17's for you but I don't have any scales. I'll see if I can borrow some.

[paulfx]

what would the offset be on the 17" and 18" euro oem rims cu2

[chunsa]

Both are +55 offset.

[SPQR]

I'd weigh my standard 17's for you but I don't have any scales. I'll see if I can borrow some.

You need only weigh one.

Aussie Top Gear once tested a new Holden V8 with 20" rims against the same car wearing smaller rims. The overall tyre diameters were the same but the 20" tyres were wider. The test showed that the smaller diameter rims "performed" better with the car achieving faster lap times. They worked out that the ultra low profile tyre had sidewalls that were so stiff that he car was bouncing around corners: There was no compliance in the sidewalls. The taller tyre on the smaller diameter rims was able to absorb mid corner bumps better and the car stayed on track better; delivering faster lap times.

I think this is the "performance focus" that MKI4EVA was referring to.

[jamesfrosty]

I've got a CL9 with standard 16" rims - I put some 18 x 7.5's on with 245/40 tyres and noticed a considerable drop in acceleration and response. The rims weren't the best quality and much heavier than my stock wheels, so I put the loss in performance down to increased rolling diameter (taller gearing) combined with increased wheel mass.
I mostly drive around sydney so I think smaller is better for performance and short gearing, but if you're doing freeway driving larger would be better.
What do you think about light, skinny 17's with low profile tyres?

[tony1234]

I've got a CL9 with standard 16" rims - I put some 18 x 7.5's on with 245/40 tyres and noticed a considerable drop in acceleration and response. The rims weren't the best quality and much heavier than my stock wheels, so I put the loss in performance down to increased rolling diameter (taller gearing) combined with increased wheel mass.
I mostly drive around sydney so I think smaller is better for performance and short gearing, but if you're doing freeway driving larger would be better.
What do you think about light, skinny 17's with low profile tyres?
Go 225/45 17s same size as the CL9 lux.

[SPQR]

I've got a CL9 with standard 16" rims - .....
What do you think about light, skinny 17's with low profile tyres?


Go 225/45 17s same size as the CL9 lux.

I've have a CL9 Standard and changed to the Honda 17" rims with 225/45R17 tyres (as per the Luxury) only to find that tramlining was unbearable. I changed to 205/50R17 tyres (same diameter as the 225's) which are the same width as the stock 16" rim tyres and the tramlining disappeared. Cured. Gone the way of Satan. Nil; Zilch tramlining.

[tony1234]

I've have a CL9 Standard and changed to the Honda 17" rims with 225/45R17 tyres (as per the Luxury) only to find that tramlining was unbearable. I changed to 205/50R17 tyres (same diameter as the 225's) which are the same width as the stock 16" rim tyres and the tramlining disappeared. Cured. Gone the way of Satan. Nil; Zilch tramlining.
I have 225/45/17s on my car and next to no tramlining.Decent tyres and a good 4 wheel alignment fixes this problem.For wheel alignment go to a place that has a mechanic that does their alignments.A lot of places like Bob Jane etc.have guys that do a 3-4 day course in wheel alignments do their theirs.

[aaronng]

Agreed, firstly a good wheel alignment is required. And I've seen so much variability that now I just tell them what settings I want and they do it for me. Essentially I am paying for the use of their machine and not their alignment settings.

Tyres also are an important factor. Due to the design differences, some tramline more than others.