Euro height (25,5"-25")??????

[Zacko]

Is really 25,5"-25" Euro height??
My car is a euro car and I had 26 1/2" - 26 3/4" in (F) and 26"-26 1/2" (R). I have lowered it down to 26" in (F) and going down to 25,5" (R). I have measured center torsion bar and wheel center and get a difference of 130 mm in (F) and 5mm in (R).

This means that I'm already under euro height. What should difference be on center torsion bar/center wheel, if I had 25,5"-25"?

Do I need the bump steer kit if I go for 26"(F) and 25,5(R) ???

My wheels are Cup2(fakes) 7,5" ET 23 (225/45-17) and 9" ET 15 (255/40-17)



Front wheel



Rear wheel

/Hans
911 3.0 SC -79

[Jack Olsen]

The Euro fender heights are only useful if the full diameter of your tires are the same as the tires that came stock with the car. Since sidewall heights vary so much when you change wheel diameters, you have to use a tire calculator to see what the difference is, split it in half, and adjust the Euro height numbers with the result.

Edit: This isn't a huge deal for your car, since your 17-inch sizes are very close to the originals.

Stock for SC were 185/70x15 in front (optional on Fuchs were 205/55x16) and 215/60x15 in back (optional on Fuchs were 225/50x16). So:

185/70x15 F = 25.2"
205/55x16 R = 24.9"
215/60x15 F = 25.2"
225/50x16 R = 24.9"

Where you have:

225/45-17 F = 25"
255/40-17 R = 25"

[210bhp]

Jack is right, it's those tyres which are giving you the problem with comparing your measurements to original heights.

Regards
Mike

[Zacko]

Just for fun I did change to my stock tires in rear(yes,I still have them)
And the ride height is exactly the same as before (26")
And measurement between torsion bar/center wheel is the same. So I'm still under euro height and have 26" to fender lip in rear???



Stock tire(15" 215/60-15)




Cup2 (17" 255/40-17)

/Hans
911 3.0 SC -79

[burgermeister]

I came up with the same questions, and posted it here also. My conclusion is that 25.5/25 measured at the fender lips is quite a bit lower than "euro height". (I have the original wheels & original size tires on the car). The wheel center to torsion bar center distance sets up jounce / rebound travel and static suspension geometry, so that's the one that matters...

Mine is around 26.5 / 26 or 26.25 / 25.25, depending on the day. The gas tank fill moves the front almost 1/2" on mine.