Wheels Again | FerrariChat

Wheels Again

Discussion in 'Mondial' started by Mondial 1985, May 29, 2014.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

Page 1 of 2
  1. Mondial 1985

    Mondial 1985 Formula Junior

    Jun 13, 2012
    344
    Greenville, SC
    Full Name:
    Mark Alan Day
    #1 Mondial 1985, May 29, 2014
    OK guys, I received an aftermarket set of wheels for my car. They were actually on it at one time before I aquired the car. I really don't care to purchase tyres for them 'cause thet're still going to be close to $300.00 apiece. I'd just as soon go an extra $200.00/tyre on that cost and buy the correct tyre from Coker. I'm probably going to get those "Superformance" 16" (resembles the OEM) at some point, but I may try toget something else in the meantime. I think we've established the OEM metric rims are closest to 16" and the width of the tyre would be 7" or 8". The hole pattern is 105. I guess the only other thing I need to know is what offset am I looking for? BTW, my aftermarket rims are for sale or trade They're 8 X 18 front and 10 X 18 rear. I'll send a picturs of the car with 'em on it for anyone who's serious about wanting them.
     
  2. 350HPMondial

    350HPMondial F1 Veteran
    Silver Subscribed

    Feb 1, 2002
    5,194
    18 mi from the surf,, close to Pismo, CA
    Full Name:
    Edwardo
    #2 350HPMondial, May 29, 2014
    Too big for you car,, unless you drop the lower A arm,,, etc.
    For with those wheels,,,
    Your roll center is goin to 2" above the pavement.
    I am running a set of. 16" rims from a 1988 Mondial.
    16 x 7" front
    16 x 8" rear
    To replace my TRX set..

    I have many spacers for rims,, if you need to borrow for set up,,, or, If you want to buy cheep.

    Your lug pattern is 108 mm like mine.

    Ciao,
    Edwardo
     
  3. afterburner

    afterburner F1 Rookie
    Silver Subscribed

    Jun 20, 2008
    3,215
    Hong Kong
    #3 afterburner, May 30, 2014
    Last edited: May 30, 2014
    390mm is 15.4", so 16" is a reasonable approximation. With 255/55 tires in the rear, you get the OEM equivalent circumference, so your speedo will read as correctly as it always did.

    180mm is 7" - which would be the width of the rim. The tire width is measured across the active tread. The same tire width can be mounted on various rim widths, within reason.

    The TRX tires are 240mm, but measured differently from imperial tires. The active tread width of the TRX tire is about 225mm. So a 225/55R16 is pretty representative of the TRX 240/55VR390 in both external diameter and active tread width.

    51mm
     
  4. Mondial 1985

    Mondial 1985 Formula Junior

    Jun 13, 2012
    344
    Greenville, SC
    Full Name:
    Mark Alan Day
    #4 Mondial 1985, May 30, 2014
    Last edited: May 30, 2014
    So for my 1985 Euro Spec Mondial QV Cabriolet (3.0), what you're saying is that I'm looking for a 16" wheel with a 51mm offset and a 108 hole pattern? I'd be running 225/55 R16?
     
  5. afterburner

    afterburner F1 Rookie
    Silver Subscribed

    Jun 20, 2008
    3,215
    Hong Kong
    #5 afterburner, May 30, 2014
    Yes, I am running 225/55 in the rear and 205/55 in the front.
     
  6. Mondial 1985

    Mondial 1985 Formula Junior

    Jun 13, 2012
    344
    Greenville, SC
    Full Name:
    Mark Alan Day
    #6 Mondial 1985, May 30, 2014
    Yeah the guy I got this car from had those 18"s on it, but I knew that wasn't for me. With my new information you guys gave me, I think I'm gonna go around to some of the wheel places and see if I can't locate a 16" rim that uses a 255/55 R16, has the 108 hole pattern, and a 51mm offset. Just 'til I can afford the Superformances.
     
  7. 350HPMondial

    350HPMondial F1 Veteran
    Silver Subscribed

    Feb 1, 2002
    5,194
    18 mi from the surf,, close to Pismo, CA
    Full Name:
    Edwardo
    #7 350HPMondial, May 30, 2014
    Yes, but my tires are now or what I am running today.
    Four, Michelin pilot SX, 205 55ZR 16

    They fit on both the 7" and 8" rims nicely.

    Edwardo
     
  8. 350HPMondial

    350HPMondial F1 Veteran
    Silver Subscribed

    Feb 1, 2002
    5,194
    18 mi from the surf,, close to Pismo, CA
    Full Name:
    Edwardo
    #8 350HPMondial, May 30, 2014
    Last edited by a moderator: Sep 7, 2017
  9. bartzagato

    bartzagato Formula Junior

    Aug 7, 2010
    614
    Belgium
    Full Name:
    Bart
    #9 bartzagato, May 30, 2014
    Edwardo

    How's your Mondi coming up?
     
  10. Mondial 1985

    Mondial 1985 Formula Junior

    Jun 13, 2012
    344
    Greenville, SC
    Full Name:
    Mark Alan Day
    #10 Mondial 1985, Jun 3, 2014
    Now, if I find a 16" (16 X 7) wheel with a 108 bolt pattern, but it doesn't have a 51mm offset - say it was a 40mm offset - would I use a spacer? I see wheels advertised like: 16 X 7; 5 X 108 +40. Does that "40" indicate a 40mm offset?
    Thanks
     
  11. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    25,138
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #11 Steve Magnusson, Jun 3, 2014
    Only if you can invent the negative thickness spacer ;)

    Putting wheel with a +40mm offset wheel on a chassis designed for a +51mm offset wheel requires removing material, not adding it. Although shifting the wheel centerlines out by 11mm (which is what happens when you install such +40mm offset wheels on a +51mm offset chassis) isn't a huge sin...
     
  12. afterburner

    afterburner F1 Rookie
    Silver Subscribed

    Jun 20, 2008
    3,215
    Hong Kong
    #12 afterburner, Jun 3, 2014
    And it will train your biceps!
     
  13. hank sound

    hank sound F1 Veteran

    Jan 31, 2004
    5,953
    Burbank, CA
    Full Name:
    Hank Garfield
    #13 hank sound, Jun 3, 2014
    Hi Edwardo,

    Your fronts are correct but your rears are 3/4" too short in diameter. Fronts are 24.9" while the rears should be (225/55/16) at 25.7". Hey ........ higher speed at any given RPM, and a cool "dumped" visual. And I forgot this ......... better gas mileage :):)

    Cheers, Hank
     
  14. Mondial 1985

    Mondial 1985 Formula Junior

    Jun 13, 2012
    344
    Greenville, SC
    Full Name:
    Mark Alan Day
    #14 Mondial 1985, Jun 4, 2014
    I've been doing a little research on "Wheel Offsets" and I understand now how offset applies. I would think (from my research) that a few mm wouldn't creat that big a difference. It appears to relate to how close the wheel is going to be to the frame. The original wheels are very shallow on the outside and deep on the inside. A wheel too deep on the outside and too shallow on the inside would make the wheel stick out of the wheel well (wouldn't clear the wheelwell) and look like a roller skate. Axle length seems to dictate "offset".
     
  15. afterburner

    afterburner F1 Rookie
    Silver Subscribed

    Jun 20, 2008
    3,215
    Hong Kong
    #15 afterburner, Jun 5, 2014
    It changes the steering effort because the scrub radius changes. Theoretically, if you change the offset, you would have to adjust the toe-in accordingly too.

    No, offset is chosen in relationship to the desired steering characteristics and effort that you want, via the combination of the kingpin inclination and scrub radius. The clearance to the frame and suspension/brakes and other elements then has to be designed interference free.
     
  16. porphy

    porphy Formula 3
    Silver Subscribed

    Dec 9, 2009
    1,203
    LouisvilleKY/Switzld
    Full Name:
    Randall Gatz
    #16 porphy, Jun 5, 2014
    Many Mondial owners replace the stock wheels with the wider and larger diameter 348 wheels with the appropriate tires to assure the correct diameter (thanks Hank). There is some difference in offset and there are two different offsets for the early and late 348 wheels (I am not home (in Vietnam) so I can't quote the offset numbers but I have never heard of anyone here making any compensatory modifications for this change in wheels on the Mondials and they report a better handling in most reported cases. Are there geometric mods that need to be made when one does this change? Please comment.
     
  17. Mondial 1985

    Mondial 1985 Formula Junior

    Jun 13, 2012
    344
    Greenville, SC
    Full Name:
    Mark Alan Day
    #17 Mondial 1985, Jun 5, 2014
    So then I could: A. Replace my wheels with 348 wheels, therefore using a standard tyre or: B. Match the bolt pattern, rim height/width, and offset of the 348 wheel if I couldn't afford a set of 348 wheels. Basically find aftermarket wheels which would be direct repalcements for the 348s? Maybe when I go into a wheel store and they ask me what car I'm trying to fit, just tell them a 348. I hate it when I go to an auto parts store looking for a simple, multi-use part and the idiot behind the counter asks about the car, then once you mention Ferrari, the part doesn't exist.
     
  18. porphy

    porphy Formula 3
    Silver Subscribed

    Dec 9, 2009
    1,203
    LouisvilleKY/Switzld
    Full Name:
    Randall Gatz
    #18 porphy, Jun 5, 2014
    Mulo Rampante has 348 wheels on his Mondial Coupe which I think is an 1985. I am sure he would be happy to provide details. If you look around you can find 348 wheels. They might need some TLC but you can find them. You will need longer stud bolts for both the front and rear and the lengths are different for the front and the rear. There are threads discussing this. Search is your friend.
     
  19. 350HPMondial

    350HPMondial F1 Veteran
    Silver Subscribed

    Feb 1, 2002
    5,194
    18 mi from the surf,, close to Pismo, CA
    Full Name:
    Edwardo
    #19 350HPMondial, Jun 5, 2014
    Hank,

    Yes I'm looking at some Pirelli P7s now for the rear.
    225 50 16
    Can't believe I can still get them in16",,,,,!
    Smile

    Edwardo
     
  20. srephwed

    srephwed F1 Veteran
    Silver Subscribed

    Apr 29, 2012
    6,470
    street,md
    Full Name:
    fred brown
    #20 srephwed, Jun 6, 2014
    check Baltimore craigslist.Search Ferrari.set of 360 wheels and tires for 850 dollars.If I had extra time and money I think I would buy them and resell on e-bay.They do require longer studs and possible machining of rear wheels but they look cool.Hope this helps
     
  21. hank sound

    hank sound F1 Veteran

    Jan 31, 2004
    5,953
    Burbank, CA
    Full Name:
    Hank Garfield
    #21 hank sound, Jun 6, 2014
    Last edited: Jun 6, 2014
    Nope .......... with 225/50/16, you're still well undersized. If you're looking at a 50 aspect ratio tire, you would need a 245/50/16 to achieve the correct rear tire diameter that is found with a 225/55/16 tire. It's kinda like ......to keep overall diameters uniform, if you go from the 55, down to the 50, you must go up from the 225 to the 245.

    Do not confuse our Mondi tire specs. with 328 tire specs.

    Cheers, Hank
     
  22. 350HPMondial

    350HPMondial F1 Veteran
    Silver Subscribed

    Feb 1, 2002
    5,194
    18 mi from the surf,, close to Pismo, CA
    Full Name:
    Edwardo
    #22 350HPMondial, Jun 9, 2014
    Mmmmm 245......?
    Beefy..!
    :)

    Edwardo
     
  23. 350HPMondial

    350HPMondial F1 Veteran
    Silver Subscribed

    Feb 1, 2002
    5,194
    18 mi from the surf,, close to Pismo, CA
    Full Name:
    Edwardo
    #23 350HPMondial, Jun 9, 2014
    Mmmmmmmmmm..!
    Beefy..!
     
  24. hank sound

    hank sound F1 Veteran

    Jan 31, 2004
    5,953
    Burbank, CA
    Full Name:
    Hank Garfield
    #24 hank sound, Jun 9, 2014
    Hi,

    If you want "beefy"........... do it in 235 (maximum - 245) /50/16.

    TIre Height Chart

    Enjoy the chart,

    Hank
     
  25. porphy

    porphy Formula 3
    Silver Subscribed

    Dec 9, 2009
    1,203
    LouisvilleKY/Switzld
    Full Name:
    Randall Gatz
    #25 porphy, Jun 9, 2014
    Thanks much, Hank.
     
Page 1 of 2

Share This Page