[928uk] Re: 18 & 19 inch wheels

[Phil Chadwick]

Michael Spiller wrote:
> 
> I think you are right. As wheel design is a matter of taste I
> have to agree that a lot of after market stuff is hideous. But
> (thank goodness) we all have different taste.

Yes, have you seen those ones with hub caps that continue to spin
after the car stops -- just right for removing the grubby fingers
of inquisitive little children?  Very, arhm, tasteful?

> You are also right
> about being able to add bigger disks inside a bigger wheel, which
> is a good argument for going to bigger wheels. I presented my
> argument based on all other things being equal.

True, but you can fit 4-piston Brembos inside the standard
Porsche 7-slot 16" wheels fitted to all S4s.

What more could you want (well, for road use)?

> However, and maybe we can find out in the next while, it is my
> understanding that the tire is only a fraction of the weight of the
> rim. I could be wrong. I'm outa town for the next three weeks but
> if the discussion is still around by mid April I'll go down to my
> local tire man and get the things weighed.

I think that Porsche wheels are around 10 to 11 kg per wheel (no tyre).
The early Club Sport magnesium alloy wheels were 9 kg (no tyre).

I have data from somebody with Design 90 wheels.  They weigh 19.7 kg
front and 20.7 kg on the rear (with tyres).

I also have one report that "early flats on a S4 weigh 18 kg" (with
tyre).

I think that good tyres in 928 sizes would weigh in the vicinity of
8 to 10 kg, new (this is an educated guess).

There's a lot of variation in tyre weight, also in rim weight (and
Porsche got it very right with their OEM wheels).

It's not at all uncommon for after-market wheels (only) to be 13+ kg.

> Best regards and give full throttle

And you.

> Mike


-- 
Phil

Be wary of strong drink.  It can make you shoot at tax collectors and miss!