Raybestos 5100 Disc Rotor/Studs

Discussion in 'The whoa and the sway.' started by DasRottweiler, Feb 4, 2020.

  1. DasRottweiler

    DasRottweiler -BuickAddict-

    Anyone using these rotors with long (3") studs?
    Need long studs to run my 3.5" Centerlines up front at the track.
    ARP 100-7702 ( which are for oem discs and drum hubs) do not seem correct as the knurl length seems short. See pic, Raybestos stud in middle , ARP on right.
    The stud on the left is from a Right Stuff rotor with a thinner than oem rotor hat. Not using them.
    2020-02-04 12.35.05.jpg 2020-02-04 12.35.29.jpg
    Any suggestions from the Racing crowd...?
    Thanks.................Jim
     

    Attached Files:

  2. DasRottweiler

    DasRottweiler -BuickAddict-

    A bit more information :
    Raybestos studs:
    Knurl diameter - 0.555
    Knurl length - 0.638
    ( from seat to end of taper)
    ARP studs:
    Knurl diameter - 0.578
    Knurl length- 0.505
    ( from seat to end of taper)
    ARP Website says hole in rotor should be between 0.006-0.016 smaller than knurl diameter.
    While I am abit out of that parameter, 0.023. I'm not worried about that as I am about the knurl length being 0.133 shorter than the Raybestos stud provided with the rotor.
    What say you???
     
    Last edited: Feb 6, 2020
  3. DasRottweiler

    DasRottweiler -BuickAddict-

    Apparently, the Raybestos 5100 number, cross references with Napa Ultra Premium Disc Brake Rotor #85532
    More food for thought....Jim
     
  4. DasRottweiler

    DasRottweiler -BuickAddict-

    No ones running long studs in OEM
    style front disc rotors?
    Anyone with some insight on what studs should work, re: that they/you are using?
    It's all that's left to do on my 70' Skylark's front drum to disc upgrade.
    BTW, 0.133 is a wee bit over an 1/8th of an inch.......Jim
     
  5. DasRottweiler

    DasRottweiler -BuickAddict-

  6. DasRottweiler

    DasRottweiler -BuickAddict-

    The studs above seem to be the ticket.
    Off to the next hurdle........JIM
     

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