Materials to Maintain Your ZHP IIIII Hand Protection IIIII Tools to Maintain Your ZHP
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  1. #111
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    The Random E46/ZHP Question Thread

    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


  2. #112
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    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.

  3. #113
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    Quote Originally Posted by ELCID86 View Post
    I think Colin's car has a xenon low beam going out. Will check it this weekend when I see him. Any suggestions on replacement bulbs? Brand, model, source? Thanks.


    Thumbs, iPhone, Tapatalk.

    Are you 100% is the bulb dying not some other part?

  4. #114
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    Quote Originally Posted by derbo View Post
    Are you 100% is the bulb dying not some other part?
    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?

  5. #115
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    Quote Originally Posted by derbo View Post
    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.


    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


  6. #116
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    Dec 2012
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    Salt Lake City, UT
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    Quote Originally Posted by stephenkirsh View Post
    Yup that's correct. Any idea on contact patch size? I don't know how it's calculated.
    Too many variables, IMO. Pressure, width discrepancies, groove style, wheel size...

    Sent from my SM-N900T using Tapatalk
    In the market for an E90 M3

  7. #117
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    The Random E46/ZHP Question Thread

    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


  8. #118
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    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.

  9. #119
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    Quote Originally Posted by ELCID86 View Post
    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?
    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.

  10. #120
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    Quote Originally Posted by stephenkirsh View Post
    Yup that's correct. Any idea on contact patch size? I don't know how it's calculated.
    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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