Does anybody know the difference in contact patch size between the zhp and zsp wheels?
Edit: using OEM tire sizes.
Big Earner
Does anybody know the difference in contact patch size between the zhp and zsp wheels?
Edit: using OEM tire sizes.
His: 05 330 ZHP Imola Red - 07 Z4 M Coupe Imola Red
Hers: 04 330i ZSP
2004 325 M56 Steel Blue Metallic - Sold
Stephen's DD & AutoX/HPDE Build Thread
Stewart WP - Z4M LCAB - M3 trans/motor mounts - DICE MediageBridge Duo - ARC-8 17x8.5"
DrVANOS - Mason Engineering Race Strut Bar - E30 Exp. Cap - Custom Black+Beige Interior - M3 Seats
Bilstein PSS10 - Turner Sway Bars 27/21 - ECST RTAB Limiters - R.E. RSM
Campieri
oddly enough I believe the ZSP tire sizes are
225/45/17
245/40/17
and ZHP is
225/40/18
255/35/18
Why the rear isn't 255/40/17 to keep ratios is beyond me.
Campieri
Originally Posted by ELCID86
Are you 100% is the bulb dying not some other part?
Capo
Really not sure. I didn't have time to pull them this w/e. I did turn them on in the daylight and looked at each bulb. At night one is definitely dimmer. Looking directly into them they both looked the same. Sound like a burnt bowl?
Big Earner
Yup that's correct. Any idea on contact patch size? I don't know how it's calculated.
His: 05 330 ZHP Imola Red - 07 Z4 M Coupe Imola Red
Hers: 04 330i ZSP
2004 325 M56 Steel Blue Metallic - Sold
Stephen's DD & AutoX/HPDE Build Thread
Stewart WP - Z4M LCAB - M3 trans/motor mounts - DICE MediageBridge Duo - ARC-8 17x8.5"
DrVANOS - Mason Engineering Race Strut Bar - E30 Exp. Cap - Custom Black+Beige Interior - M3 Seats
Bilstein PSS10 - Turner Sway Bars 27/21 - ECST RTAB Limiters - R.E. RSM
Campieri
Too many variables, IMO. Pressure, width discrepancies, groove style, wheel size...
Sent from my SM-N900T using Tapatalk
2004 E46 Imola Red 330i ZHP2008 E90 Sparkling Graphite M32011 E70 Black Sapphire X5 35d
Big Earner
Ooooo I found an automatted calculator.
http://bndtechsource.ucoz.com/index/...alculator/0-20
According to my numbers and their calculations, the front wheel on the zsp has a slightly larger contact patch, unexpected. The rear contact patch on the zhp is slightly larger, as expected.
His: 05 330 ZHP Imola Red - 07 Z4 M Coupe Imola Red
Hers: 04 330i ZSP
2004 325 M56 Steel Blue Metallic - Sold
Stephen's DD & AutoX/HPDE Build Thread
Stewart WP - Z4M LCAB - M3 trans/motor mounts - DICE MediageBridge Duo - ARC-8 17x8.5"
DrVANOS - Mason Engineering Race Strut Bar - E30 Exp. Cap - Custom Black+Beige Interior - M3 Seats
Bilstein PSS10 - Turner Sway Bars 27/21 - ECST RTAB Limiters - R.E. RSM
Campieri
Actually it also even varies from manufacturer specs.
Contact patch sometimes measured as tread width but since most contact patches now are more rounded, its hard to say when the actual start of the contact patch is. There is no standard on how to measure tread width. The only thing you can really measure with a standard is section width which is the length from the edge of inner sidewall to the outer sidewall. This doesn't really give you what the contact patch is though..
Tread width comparision..
255/35/18
Dunlop star spec II , tread width 9.6"
Bridgestone RE11A , tread width 9.4"
Hankook RS3 , tread width 9.5"
pulled from Tirerack specs.
Campieri
I would swap the brighter bulb to the other side to confirm it is indeed the bulb. If it isn't, you gotta work a little more and swap ballasts.
Messaggero
the 40 in 255/40.18 means it is 40% of the 255MM sidewall.
so the 40 in 245.45/17 means 40% of the 245mm sidewall
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