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Any Experience with new 615k+ or RS4


MST Engineer
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Now that there has been a few races this season I wanted to know if anyone has branched out and tried some of the new tires on the market.  More specifically I was looking at the Hankook RS4 and the Falken 615k+.  We currently run V2 Star Specs in 205/50/15 on our Miata but the current sale on the 615k+ has us intrigued.  I know that the old 615k was lacking on grip but lasted a long time.  My only concern is that the new tire might overshoot the compound and end up being something like the RE71R.  

 

Also considering going to a wider tire later this year when a new engine goes in so interested in the RS4.

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1 hour ago, MST Engineer said:

  My only concern is that the new tire might overshoot the compound and end up being something like the RE71R.  

 

 

that would be awesome....re-71 at a 20% savings...I would have to re-visit Falken

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1 minute ago, Hi_Im_Will said:

Maxxis is a sponsor?  

Mike's latest red flag.  Free sets at Daytona, Road America and Mid-Ohio for top-5, then contingencies.

Edited by Bremsen
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7 minutes ago, Bremsen said:

Mike's latest red flag.  Free sets at Daytona, Road America and Mid-Ohio for top-5, then contingencies.

 

Huh.  They wouldn't give me time of day when I was trying to get some sponsorship and setting track records on their tires, now that somebody else offers a 245/40R15 (and probably a faster one), they're offering freebies.  Cute. 

 

Anyway, in my experience they're on par with a Z1* - that is, decent tire, but a few years behind.  Tend to overheat if you really push them, so ironically enough, we have to spend $20/tire to get them shaved so they don't chunk all over the racetrack.  We run them because they're 245s, given the choice we'd run a ZII* or a RE71R, depending on weather.  

 

Wonder if that contingency comes with shaving...or maybe RC1s for track day fun.

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As long as they continue to call the tire RT615, it remains a RT615. Its so old in design and has under achieved its whole existence.Why would we expect the + to be better.

As far as RS4s are concerned, they come from a long line of ever improving tires so we expect good things.

 

Maxxis, well all they had going for them was the big size- now others have it , with better compounds.

 

In the end , different tires work for different team goals. I have seen teams use up to 3 sets of stickers on drive wheels for one weekend to be competitive om RE71s- the obvious fastest tire but no longevity. Others like cheap hard tires that last several race weekends- but cannot expect to be competitive for the podium.

 

In the end- good money will bet on the RS4...again.

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