are 17s the biggest rims that will fit ?

mnext02 · 01-19-2008, 08:32 PM

I want full face chrome wheels in the largest size I can get. I think that is 17" . Who will make these in 3 lug?

**jwight** · 01-19-2008, 08:46 PM

No idea; I think you'll be looking at Canadian or European sites to find something like that for now. Good luck!

John

PS - try contacting: http://www.flyingtiger.ca/04products/smart.html

Karl Roth · 01-19-2008, 10:09 PM

from the owners manual pg 75

"The ESP "trademark" will only function properly if you use wheels of the recomended tire size >page 299"

bang blab computers... karl

smarticus · 01-19-2008, 11:52 PM

The Brabus 112 runs 17's in the front and 18's in the rear, on a lowered suspension. The esp seems to be functional with this imbalanced set, so why would it go crazy with a set of 17's all around? The important thing I think, is to keep the overall dia. really close to stock.

Smarticus

**jwight** · 01-20-2008, 05:33 AM

I think somebody posted already that Penske hasn't approved the use of any aftermarket items, including wheels, at this point. So, if you put 'em on and have trouble later I think PAG will deny any warranty coverage.

John

Fredvon4 · 01-20-2008, 08:07 AM

The Speedo sense is from a gear train in the transmission. I expect the output is not a spinning cable to the back of the speedo but a electronic pulse to the ECU and ABS computers... sounds like to adapt to larger or smaller diameter tires a gear change is needed to re-calibrate to a true speedometer indication

ESP is a different animal... each axle has a tone ring and a mag pickup that sends a speed (RPM) signal to the comparison computers. This system is tied into the anti lock brake system. There are also longitudinal and lateral accelerometer sensors in the system... All of these inputs are used to counteract lost traction, under-steer, emergency stopping and several other subtle and not so subtle safety issues...

What I am saying is that while true, tire diameter can be re-calibrated technically to give a true speedometer reading, there is no effective way to compensate for the ESP safety features.... So it is critically important that any tire width changes maintain the factory designed diameters

They are:

The 155x60x15 works out to a diameter of 22.32"---931.8 revs per mile
The 175x55x15 is 22.57"---921.5 revs per mile

So if you do want wider tires on larger diameter rims you must make tire selections that stay very close to the factory diameter/revs per mile setting..... Because there is a slight split in the factory tire diameters it is safe to assume some small error can be compensated for...BUT not much

Think of what happens to a tire as it wears... it decreases diameter and increases revs per mile...thus there is a small range of error that the ESP computers can compensate for