Falken RT-615
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2004-2007 Cadillac CTS-V General Discussion Discussion, Falken RT-615 in Cadillac CTS-V Series Forum - 2004 - 2007; ...
  1. #1
    Silver Baron's Avatar
    Silver Baron is offline Cadillac Owners Fanatic
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    Falken RT-615

    I am contemplating to get these for the stock rims:
    Falken RT-615 http://www.falkentire.com/615micro.htm
    I have high hopes that they take me to the track / around the track and home again. And that for many weekends.
    However, closest size they come:
    255/40/18 (should actually be 8.5 or larger rim!) or 245/40/18
    That’s a 2.5 and 3.5% difference in diameter to stock.

    Question now:
    Can that easily be reprogrammed (e.g. via EFILive) to fix speed etc.
    Do I throw any error codes?
    Will Odo – Navi or anything else get confused if I do not reprogram?

    Rick or anyone?

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  3. #2
    ace996 is offline Cadillac Owners Connoisseur
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    Re: Falken RT-615

    When me stockers wear out, Azenis615s will be on my car. I used the Azenis RS, the old one, for autox and street and have NEVER had street tires stick like them. They also wear very well, 15K miles on my MR2Spyder...but they were utterly bald when replaced.

    In regards to size, as long as all four tires are the same, you shouldn't throw any codes...but the speedo will be different, just use the GPS for the correct speed.

    Note* Azenis are known to have very stiff sidewalls and usually weigh a little more than less focused meats.

    Good luck, let us know how you like them.

  4. #3
    Dreamin is offline Cadillac Owners Connoisseur
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    Re: Falken RT-615

    Run 255/40... If you run them all the way around, no codes or issues. You can reprogram the speedo via EFILive... but why bother if you're only using them for weekend track event?

    Have you looked at the Toyo RA1s ? Great track tire that can be driven on the street.

  5. #4
    ace996 is offline Cadillac Owners Connoisseur
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    Re: Falken RT-615

    Yes, the RA1s are a good choice, fantastic longevity with only a small tradeoff of grip vs. Kumho or Hoosier R's. I don't know of anyone having RA1s last longer than 5k miles on the street, though. Come to think of it....most F1 drivers don't last much longer

    The Azenis would be used for "street tire" classes, the RA1s are R-compounds and would not be allowed in street tire classes....if, of course, that is important to you. Either way they're both awesome meats.

  6. #5
    Silver Baron's Avatar
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    Re: Falken RT-615

    Dreamin - Run 255/40...
    You don't think the stock rim is a bit narrow?

  7. #6
    ace996 is offline Cadillac Owners Connoisseur
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    Re: Falken RT-615

    255s are fine on the stock rim, just don't go offroading

    The Azenis or RA1 have stiffer sidewalls than normal street tires so no worries with the rim width.

  8. #7
    Dreamin is offline Cadillac Owners Connoisseur
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    Re: Falken RT-615

    Silver: The 255 will be a faster tire (HMO)... it's a good bit wider, it's a little taller (you dont need shorter tires with the hp/tq the V puts down), and most importantly: the "approved rim width" shows 8.5"... perfect for the stock rims.

  9. #8
    CVP33's Avatar
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    Re: Falken RT-615

    Here's a source for the Falken "race" tires. They also have the Toyo's in a 245/40 at about $75 more per tire.

    http://www.edgeracing.com/tires/2554018/

  10. #9
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    Re: Falken RT-615

    I guess for the price that's a good tire(Falken), but I've just never trusted them. I just personally have never seen them on an autocross and at a 200 treadwear, that doesn't sound "a notch below a race tire". But that's just me.

    If money isn't that much of an issue, I would personally go for the BF Goodrich T/A KD in the 245/40 18 size. These have been heralded up and down for their all out dry grip. These are truly a tire that is just one step below a race tire. And really, the price is actually very good at $216 per tire.

    For your situation, that would be my choice.

  11. #10
    ace996 is offline Cadillac Owners Connoisseur
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    Re: Falken RT-615

    I cannot say enough about the Azenis. TBJS, if you check the equipment stats of the Nationals, you'll see that the TAKD are used most with the Azenis next popular. If the prices are similar, I'd go with the BFGs but usually they are too expensive. The grip difference on a typical autox will only be a tenth or two. You can't go wrong with either. Again, when the F1s are done...the new Azenis will go on.

    Be good,
    ace996....should probably be ace-v06 now

  12. #11
    thebigjimsho's Avatar
    thebigjimsho is offline Cadillac Owners 10000+ Posts
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    Re: Falken RT-615

    (In my best Johnny Carson voice)I did not know that!!

    Then spend away!!

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