RT-615's - Reinforced or normal sidewalls? - Focus Fanatics
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Old 03-18-2008, 08:12 PM   #1
Dcl2049
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RT-615's - Reinforced or normal sidewalls?

I'm looking at these for auto-x and was wondering if someone had experience with these.

Apparently there are 215/40/17's that have reinforced sidewalls (my current size tire) and 215/45/17's with "normal" sidewalls, which of course is the SVT tire size and a recommended favorite around here, as you should all know.

So, what would suit the track better? I would assume reinforced but that's why I'm asking the question, I can only assume and you know what they say about assuming. I have never run 45's either, so I'm not even sure if I would rub or not (pretty mild drop). I didn't have any problems with a 40 series.


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Old 03-18-2008, 08:32 PM   #2
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The reinforced sidewall will help your turn in, especially in the Focus which is not particularly light. Under hard lateral load the sidewall can roll over, which screws up the contact patch and therefor your grip situation, a stiffer sidewall helps to mitigate that. They will also ride stiffer on the road, if they're only track tires there's no big deal.
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Old 03-18-2008, 08:57 PM   #3
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I have run the 215/40-17 Azenis, and the sidewall is very stiff. The problem I found with Azeni's as track tires was heat management.

The Dunlop Z1's are on closeout at Tire Rack - 215/40s are something like $85 (new spec tire on the way from Dunlop). I was very pleased with these as track tires, so they may be worth a look.
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Old 03-18-2008, 09:02 PM   #4
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I don't care about my ride, I ride with the shocks cranked down on crap roads all the time so it's all good.

Are the Dunlops STS legal? That's what I need. I'm aware of the heat issues but I'm looking for something I can use on the track and street. I only have one set of good rims.
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Old 03-18-2008, 09:05 PM   #5
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i have them on the front of my car and the side wall is hella stiff. i love them tho. good tire in my view. plus if i'm not mistaken going to a 40 instead of a 45 should bump your gearing up a little and help acceleration. thats what i did with mine went up to a 205-50-15 from a 195-60-15. you can tell the difference. pulls alot harder or at least it feels like it does on the good old ass dyno.
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Old 03-18-2008, 09:07 PM   #6
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about the driving on the road, i had put my on a few weeks ago and it has rained like hell since i did this and i have had no problems with them. they are amazingly good in the rain. had a few problems with the ice/snow mix the other morning but thats a givin. what kinda struts and shocks you running? i have agx's as stiff as they go.
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Old 03-18-2008, 09:20 PM   #7
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Quote:
Originally Posted by Dcl2049 View Post
I don't care about my ride, I ride with the shocks cranked down on crap roads all the time so it's all good.

Are the Dunlops STS legal? That's what I need. I'm aware of the heat issues but I'm looking for something I can use on the track and street. I only have one set of good rims.
Yes, they are STS legal. If these will be your only tires, I would worry a little about a 40-profile tire if you have bad roads. I still haven't taken them off after the track event, but I don't have crappy city streets to deal with.

I think the Dunlops are also said to be markedly better in the rain than the Azenis.
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Old 03-18-2008, 09:28 PM   #8
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Haha we're in a drought now so yeah...

I'm on Koni shocks and springs, the drop is "1.6" but it looks only a little lower than an SVT honestly. I run 40's no problem right now on these streets so no worries there. The roads aren't really bad bad, just uncomfortable. I'll take a look at the Dunlops. How long do they last compared to the Azenis? I've been told to expect around 10K with use as mixed track/street tires.
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Old 03-18-2008, 09:32 PM   #9
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i'm not to sure there. i have only had mine for a little while now. they are nice tires tho. i'm still able to mess around a little when its wet out. the only issue i have with them is they do like to spin in first gear. but then again we have not broke 60 since i put them on so that could be part of my problem.
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Old 03-19-2008, 09:56 PM   #10
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As far as the Dunlops, they haven't performed very well at any events I've been to.
The Azenis RT-615 have been a much better choice.
I've seen the Dunlops chunk up pretty good.
I think the reason the Dunlops are attractive now is due to the closeout prices.
At full tread depth down to 1/2, the Azenis stick pretty damn well in the rain.
Below that...be careful.

For your car, a 215/40 is closer to the stock gearing.
But...
The 215/45 Azeni runs quite a bit wider than the 215/40.
I'm not sure why, but it's close to a 1/2 inch.
But, it's also taller and heavier.

If you spin the tires a lot coming out of a corner, the taller tire will help.
But then again, so will letting up on the gas a bit.

I'm assuming you have aftermarket wheels??
Meaning...low offset? (40-42mm)
If so, with the 1.6" drop, you most likely will rub on heavy bumps with the 215/45,
unless you're running some pretty high camber numbers in the front.

And...remember, there are other choices...
Bridgestone RE-01R
http://www.focusfanatics.com/forum/showthread.php?t=149887
Kumho is coming out with a new tire...
http://swmtscca.org/forum/viewtopic.php?t=724
^^^Ah man...I got on my soap box in that thread.
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