245/35/20 DON'T DO IT!

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  1. itrgsr94

    itrgsr94 Never Fake Never Phony

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    This post is to discuss the differences in using taller sidewall on the FK8. (My POV)

    I purchased the Falken FK510 tires a few weeks ago in a 245/35/20.

    I immediately noticed the steering response was much slower but wanted to put a few miles to break in the tire. That still hasn't changed, while it is more comfortable the car lost its edge and feels off.
    Most importantly the acceleration has been muted, it's not nearly as visceral when WOT in second gear.

    The car just doesn't pull as hard as before. (bone stock)
    After a year you know your car, and it's not placebo it's real.
    Personally, the tradeoff for comfort wasn't worth it.
    I'm pretty sure it's the added sidewall and small but significant increase in diameter.
    The calculation in tire size online doesn't tell the whole story, there is a reason Honda used the 30 profile.
    I will be looking to go back to the stock size tire within a few months.

    P.S.

    The tire itself is not bad, not quite as much grip as stock, but no slouch.
     
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  2. Justinus

    Justinus Senior Member

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    The Schwab's computer system had 245/45R19 as the tire size for our Malibu when the OEM size was actually 245/40R19. The increase in size messed up everything about the acceleration and handling of the car.

    We took it back and made them put on the correct tire size and problem solved.

    That 5% sidewall difference is a huge deal on tires this wide, especially with low profile tires on big wheels.
     
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  3. Noize

    Noize Senior Member

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    The problems that you’re noticing have much less to do with the sidewall height and much more to do with the fact that the FK510s are pretty crap tires for performance, slotting below even the Firestone Indy 500s.

    Especially compared to those super sticky factory Continentals.

    In 245/35/20, there are really only two choices to retain factory performance: Bridgestone RE-71R and S007A. The Michelin PS4S are a bit of a step down in ultimate track performance from these two, but still light years better than those janky FK510 Falkens.
     
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    itrgsr94

    itrgsr94 Never Fake Never Phony

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    #4 itrgsr94, Jan 8, 2019
    Last edited: Jan 8, 2019
    I don't wholly disagree, but the main point is for people considering changing the tire size, and how it affects the car.
     
  5. gtman

    gtman Senior Member

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    What is this fascination with having no sidewall? Unless you drive on the Autobahn, it's a bent wheel waiting to happen.
     
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    itrgsr94

    itrgsr94 Never Fake Never Phony

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    That's why I increased it, but the tradeoff's were not worth it.
    Honda did it for a reason, if they could have used more sidewall on the factory wheels and gotten the same performance they would have.
     
  7. breakingakajav

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    Or you know, the fact that they developed the car at the ring so they used a tire that gave them the edge to set a lap record over using crappy 510's but you know, it's your life.
     
  8. OP
    itrgsr94

    itrgsr94 Never Fake Never Phony

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    Do you have Sport Cup 2's on your R? How do they handle?
     
  9. .grimace

    .grimace Senior Member

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    You went with a much less aggressive tire what were you expecting? Even at 300 I think that's a stretch. You can run a 245/35/20 no problem but use something aggressive like a RE71r you just chose a wimpy compound sadly. Has a wimpy sidewall and grip to elaborate
     
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    itrgsr94

    itrgsr94 Never Fake Never Phony

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    For daily driving there has to be some tradeoff 200 compound wouldn't work for me.
    I'm looking into the PS4S as I hear they wear fairly well given there abilities.
     
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  11. .grimace

    .grimace Senior Member

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    Fair enough, I forget I only put like 7000 miles a year on mine so tire life isn't a big deal.

    Regardless going to a harder compound vs stock is always going to ruin handling and performance. I remember when the STI and EVO first came out in 04' and people were replacing tires and brakes with junk ones and wondering why stock versions were out performing them LOL
     
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    itrgsr94

    itrgsr94 Never Fake Never Phony

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    Exactly, lesson learned!
     
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    ctrmofo Senior Member

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    LoL I’ve said it once and say it over and over...get the right size and circumference.

    If you want more sidewall, go down to 19” and run 245/35/19 all day every day...even faster car.
     
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  14. OP
    itrgsr94

    itrgsr94 Never Fake Never Phony

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    Indeed!
     
  15. dixie1

    dixie1 Member

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    For track the 245 30 20 are not so great , look at the sidewall,all lettering gone :)

    48929039_1984067175014439_7852875632290562048_n.jpg

    49536000_1984067165014440_4446221346787033088_n.jpg
     
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