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Technical Rear Bias Ply

Discussion in 'Traditional Hot Rods' started by sbf001, Mar 12, 2016.

  1. sbf001
    Joined: Nov 28, 2013
    Posts: 318

    sbf001
    Member
    from New York

    Hello
    I have a 30 model a frame with 3in z. And 4in drop axle. I have 28 3/4in bias plys on the front would a 31in be ok to run on the back?
    Thanks
     
  2. clem
    Joined: Dec 20, 2006
    Posts: 4,218

    clem
    Member

    Most run that height tyres.
    Should be okay, but more details needed.
    All relates to diff ratios and gearbox ratios.
     
  3. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 31,262

    Jalopy Joker
    Member

    post pics of your ride
     
  4. sbf001
    Joined: Nov 28, 2013
    Posts: 318

    sbf001
    Member
    from New York


  5. 19Eddy30
    Joined: Mar 27, 2011
    Posts: 2,320

    19Eddy30
    Member
    from VA

    Are you asking if you can run a taller tire on rear , Biger then front ,
    Yes !
    As long as it a bias also ,
     
  6. sbf001
    Joined: Nov 28, 2013
    Posts: 318

    sbf001
    Member
    from New York

    I just have roller Tires on there now. I have 28 3/4 just wondering if I can run a 31in on the rear. Have to glass wheels wells back in previous owner cut them out.
    Thanks
     
  7. Tim
    Joined: Mar 2, 2001
    Posts: 17,211

    Tim
    Member
    from KCMO

    Short answer: yes.
     
  8. Personally, I would think of running a smaller front tire, 28 3/4" is a fairly tall tire, not sure you'll notice that much difference with a 31" rear tire if you're looking for a rubber rake.

    Mick
     
  9. just read some threads, most people run a 550-16 or 600-16 up front and 700-16 or 750 -16 out back I have 600's in front and 750's on rear I think the 750's are around 31" tall. so the answer is yes.
     
    John Heckman likes this.
  10. IMG_6029.JPG .............14" rear Z, 12" stretch 560x15 bias frnt, 700x16 bias on rear(note) run 28-32 psi all the way around on bias ply tires to eliminate squirreling)
     
  11. 14' rear Z, 12' front stretch.......560x15 frnt,700x16 all bias ply (note: run 28-32 psi in all to minimize or eliminate squirreling with bias ply tires) Handles great.
     

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  12. sbf001
    Joined: Nov 28, 2013
    Posts: 318

    sbf001
    Member
    from New York

    Is a 4.50 a 25in overall diameter? I am thinking about 25in on front and 28 3/4 on the back
     
    Last edited: Mar 15, 2016
  13. I believe a 4.50 is 24" in diameter. it works really well with a 7.00x16 (30" approx.) on the rear. 7.50's start to get close to 31". There is a lot of open space at the back of a roadster...fill it up.
     
  14. sbf001
    Joined: Nov 28, 2013
    Posts: 318

    sbf001
    Member
    from New York

    I will just run my 28 3/4 on the front and get 31in for the back. Thanks for all the replies.
     
  15. Boolajosh
    Joined: Jan 29, 2012
    Posts: 77

    Boolajosh
    Member
    from Monrovia

    1458380682258.jpg

    4.50/4.75x16 front, 7.50x16 rear.. and I only have like, a 2"z

    Sent from my SM-G920V using H.A.M.B. mobile app
     
  16. verno30
    Joined: Aug 25, 2008
    Posts: 1,150

    verno30
    ALLIANCE MEMBER

    If the bolt patterns are the same, I would put the front tires on the rear and go with a 4.75-5.25 on the front. What axle ratio and transmission are you running? Truthfully, that may be the deciding factor.
     
  17. sbf001
    Joined: Nov 28, 2013
    Posts: 318

    sbf001
    Member
    from New York

    I have pontiac 2spd and 3:73 gears s10 rearend
     
  18. Run 7:50 16's in the rear and 5:50's on the front. That combo looks great.
     
  19. verno30
    Joined: Aug 25, 2008
    Posts: 1,150

    verno30
    ALLIANCE MEMBER

    ^^^^^Agreed. Run your current tires in the back and get some smaller rubber for the front.
     

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