New tires, opinion? | FerrariChat

New tires, opinion?

Discussion in '365 GT4 2+2/400/412' started by jes-13, Feb 28, 2017.

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  1. jes-13

    jes-13 Karting

    Jun 9, 2006
    56
    California
    Full Name:
    John
    #1 jes-13, Feb 28, 2017
    The tires on our 400i are long expired.. it currently has 240/45ZR-415 Michelin TRX GT. I was going to replace them with the original size, 240/55-415, because it's original ;) and will correct the speedo.

    Just wondering what the group thinks...
     
  2. bjwhite

    bjwhite F1 Rookie

    Mar 17, 2006
    4,685
    Seattle, WA
    Full Name:
    Brian White
    #2 bjwhite, Feb 28, 2017
    Yes. Longstone.
     
  3. blkprlz

    blkprlz Formula 3

    Mar 24, 2007
    2,169
    Tampa bay
    Full Name:
    Bruce
    #3 blkprlz, Feb 28, 2017
    +1 on going back to the original 55 aspect ratio, they just look better proportioned than the 45's.
     
  4. roger21

    roger21 Formula Junior

    Aug 13, 2015
    262
    France
    Full Name:
    Stéphane
    #4 roger21, Feb 28, 2017
    Mine had the 240/45 TRX on when I bought it.
    I changed for the 240/55 immediately and don't regret it. The car really looks better with them. Of course, to each his own, but the "55" tires really fill the fender. They "fit" they look correct...
    On top of that the car will be about 1 or 2 cm higher wich is real comfort and will help you not destroying your manifolds!
     
  5. JAnastas

    JAnastas Karting

    Nov 24, 2013
    130
    Los Angeles
    #5 JAnastas, Feb 28, 2017
    Same. My car came w/ the 45 series when bought; replaced w/ proper 55 series. Handles better, looks better.
     
  6. jes-13

    jes-13 Karting

    Jun 9, 2006
    56
    California
    Full Name:
    John
    #6 jes-13, Mar 1, 2017
    thanks for the feedback :D
     
  7. Temerian

    Temerian Formula Junior
    Silver Subscribed

    Jun 17, 2014
    438
    Manhattan
    Full Name:
    Rick Temerian
    #7 Temerian, Mar 1, 2017
    Related question- my car currently has Pirelli P4000 215/70 ZR 15 tires of unknown age.
    Should I replace with Pirelli or Michelin? All opinions appreciated!
     
  8. GT Jones

    GT Jones Formula Junior

    Oct 15, 2011
    669
    Lincoln, MA
    Full Name:
    Christian J
    #8 GT Jones, Mar 1, 2017
    215-70-15 is basically now a minivan size so its very hard to find a high speed rated tire.
    I am currently using Yokohama Avids while I sort out the car. They're fine and one could argue better than what the car was designed for but not a great performer. Once my car is ready for regular use I'll go to a performance tire.
    I had very worn avon's on another car once and really loved them. Great grip but low tread life although you will probably out-age any tire before you wear out on miles. Look for the 215-70r15--avon-cr6zz-road-race
     
  9. Tomg

    Tomg Rookie

    Nov 7, 2003
    39
    Minnesota
    #9 Tomg, Mar 2, 2017
    Replaced the original TRX's we a new set of TRX 240/55VR415's from Longstone last spring after much thought about wheel spacers and other options to move to non-TRX sizing. Overall I'm happy with the decision. Car rides and handles much better on the new rubber. Longstone was easy to deal with.
     
  10. Longstone Tyres

    Longstone Tyres Formula 3
    Sponsor

    Feb 2, 2006
    1,812
    Full Name:
    Dougal
    #10 Longstone Tyres, Mar 9, 2017
    Hi

    Thank you for the kind words.

    You can get them off here 240/55VR415 Michelin TRX | Longstone Tyres

    Or here https://www.borrani.com/michelin-tyres/trx/240-55vr415-michelin-trx.html

    I've just checked and the date code we have on the shelf today is 4216. so about 5 months old.

    there is 61mm difference in diameter between the 45 profile tyres and correct 55% profile tyres. and that is in a diameter of 679mm (25.4mm = 1"). so that is 9% difference which is massive when it comes to speedo reading, gearing, fuel consumption, etc. Also in the UK we have these horrible speed bumps. designed by idiots to control idiots. I would suggest that extra inch and a bit clearance could save you some money in exhaust pipes.
     

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