RE: 17" wheels on a Spider

["Peter Webb" <webb.p@domain.elided>]

What doesn't compute here is (according to manufacturers website) the lower
profile tire with the same OD weighs the same or more than the larger
sidewall size.   Logically, it's less rubber, and I stand my the statement
that the added aluminium in the wheels (simply elongating the spokes,
depending on design) is less.

The key to both arguments here could very well be design.   Since the
original statement was that swapping to big 17" wheels will add unsprung
weight, I think the numbers show that to be untrue.   Apples to apples it
seems like it depends on the wheel and tire combo you choose.

-Peter


> -----Original Message-----
> From: owner-alfa@domain.elided [mailto:owner-alfa@domain.elided]On Behalf Of
> Joe Elliott
> Sent: Saturday, November 23, 2002 6:49 PM
> To: Peter Webb
> Cc: Alfa Romeo Digest
> Subject: RE: 17" wheels on a Spider
>
>
> >  >>The replaced rubber weighs more than the gained aluminium.
> Same OD and
> >LESS
> >>>unsprung weight.
> >
> >>I somehow doubt that.
> >
> >Check the numbers:
> >
> >My car stock: (phonedial weight from memory and probably a generous
> >approximation).
> >
> >S-03 Pole Position - 22lbs  205/50-15 + ~23lbs Milano Phonedial wheels =
> >45lbs unsprung.
> >Khumo ECSTA 712    - 20lbs  205/50-15 + ~23lbs Milano Phonedial wheels =
> >43lbs unsprung.
> >
> >My car now:
> >
> >S-03 Pole Position - 25lbs  225/45-17 + 17lbs Team Dynamics DTM wheel =
> >42lbs unsprung.
> >S-03 Pole Position - 21lbs  215/40-17 + 17Lbs Team Dynamics DTM Wheel =
> >38lbs Unsprung.
> >
> >
> >And from Mike Nakamura's very informative posting:
> >
> >6 X 15 Phone dial from 91 Spider = 23 pounds.
> >6.5 X 14 Montreal Turbina = 12.8 pounds (Campangolo)
> >7 X 17 HRE 526 that I put on Montreal = 19 pounds (will fit Spiders)
> >
> >Phone dial with 195/60 P6 tires (used) = 41.5 pounds
> >Phone dial with 205/55 ZR 15 P7000 tires (new) = 42 pounds
> >Montreal Turbina with 205/60 VR 14 P600 (almost new, less than 3,500
> >miles) = 34 pounds
> >HRE 526 with Bridgestone Pole Position SO-2 (new) = 42 pounds
> >
> >195/60 P6 = 18.5 pounds (used)
> >205/60 VR 15 P6000 Sport Veloce = 23 pounds (new)
> >205/60 VR 14 P600 = 21 pounds (almost new, less than 3,500 miles)
> >205/55 ZR 15 P7000 = 19 pounds (new)
> >205/50 VR 15 P700Z = 20 pounds (new)
> >215/40 ZR 17 Pole Position SO-2 = 23 pounds (new)
> >
> >
> >In most of these cases, the larger wheels and smaller tires
> weigh less that
> >their
> >stock or near stock counterparts.
> >
> >-Peter
>
> Stock wheels might just be heavy.  My statement assumed similar
> wheels in two different sizes.  The data above just indicates that
> expensive aftermarket wheels are lighter than Alfa's phonedial alloys.
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