Tire sizes?

[FanIsHere]

I insist on 14s due to weight and lowering the car weight center. But I haven't decided if I need 185 or I can go to 195 on 6-6,5 rims.

Stock tire dimensions were 185/60R15 right?

[d3nso]

stock dimensions are 185/60/14 on 14x5.5 rims or 175/70/13 on 13x5 rims.

[Bean]

I assume you are aware that the difference between a 195/50R15 on a 15x7 and a 185/60R14 on a 14x6 is 500g max per wheel&tire combo. Also with the above example that keeps your speedo about the same you wont lower the car in any way and therefore neither the car weight center... If your serious about saving unsprung weight then you need to drop some big cash on a set of TE37V (usually about 1-2kg less than the competition) and a custom brake setup... I personally have an AP big brake upgrade in the plans that should lower the unsprung weight by around 3kg per corner.
To make another example a set of alloy wheel hubs will save 1kg per side, if you want to go further the modception bigbrake kit will shed 2kg per side. These difference are disregarding the wheels themselves.

[FanIsHere]

(06-01-2016 08:08 PM)Bean Bandit Wrote:  I assume you are aware that the difference between a 195/50R15 on a 15x7 and a 185/60R14 on a 14x6 is 500g max per wheel&tire combo. Also with the above example that keeps your speedo about the same you wont lower the car in any way and therefore neither the car weight center... If your serious about saving unsprung weight then you need to drop some big cash on a set of TE37V (usually about 1-2kg less than the competition) and a custom brake setup... I personally have an AP big brake upgrade in the plans that should lower the unsprung weight by around 3kg per corner.
To make another example a set of alloy wheel hubs will save 1kg per side, if you want to go further the modception bigbrake kit will shed 2kg per side. These difference are disregarding the wheels themselves.

I was thinking something like Watanabe or SSR 14x6/6.5 which are near 5-6kg each. So the difference between the 14s and 15s will be around 3kg at each corner. That makes us 12kg!

On 14s I think that Willwood 4piston small brake kit fits easily or even RX-7 FC's brake calipers (not so sure).

As far as the height, the difference between 185/60R14 and 195/50R15 is around 1cm lower than the 15s! 185/55R14 are arround 2cm lower than the 15s!

I don't mind about the speedo btw.

But you made me think of keeping my KOSEIs as much as I can, until I find a set of good lightweight 14s! There are much more options on 195/50R15 tires too!

[pack]

RX7 calipers with 14' wheels might a trouble.....

[kjb]

FC RX7 calipers & brake discs (276mm) do fit with some 14" wheels, for example the classic 14x7" ET10 Melber 5-spoke wheels (I had this combo on one of my corollas until someone stole the wheels...).

On the turbo corolla I now have 235/45/R13 on a 13x9" wheel. Still burning rubber on 3rd gear...
In the future I'm probably going for a 15" wheel because of the better availability of tyres.

[Deuce Cam]

It depends on what you want out of them, but for best performance/feel: match 185s to 6/6.5j, and 195s to a 7j. (FYI 195s are a little bubble'ish even on a 6.5j wheel.)

[roman]

(05-31-2016 12:27 PM)d3nso Wrote:  If you want good performance in the wet Yokohama AD08R are the way to go. I'm running them in my daily car (civc EG) and the performance in the wet is outstanding für a performance tire
No other tire i've driven comes close to them in terms of wet/dry performance.

At a local track here, switching from Toyo Proxes T1R over to the AD08R skimmed 2.7 seconds off my laptime.

Completely nuts considering it's still such a well behaved street tire!

In my opinion they dont inspire confidence in the wet though, T1Rs were better on the street. But the fact that they dont overheat on track is an awesome novelty when you've been using melty T1Rs for god knows how long.

[d3nso]

Well my expirience is the oposite regarding wet performance. I had T1R on my Subaru Impreza GC8 and the perfomance in the wet was worse than the AD08R. But hard to compare a 1.2t 250HP turbo car with a 1t 125HP NA one
But i totally agree with you the Yokohamas can withstand alot of heat.

[NoHachi]

(06-09-2016 07:18 PM)Deuce Cam Wrote:  It depends on what you want out of them, but for best performance/feel: match 185s to 6/6.5j, and 195s to a 7j. (FYI 195s are a little bubble'ish even on a 6.5j wheel.)

Better late then never... but you really want 7.5" or 8" rims to make optimal use of true 195s. Rule of thumb: Wheel should be at least as wide or slightly wider then the thread width of the tire. Thread width is in italics because it doesn't match the 195 designation on the side. Some manufacturers list it, others you have to measure and differences can be large. There is a bunch of corner entry feel to be found in ever so slightly wider rims.

Decent tire choices are much cheaper and widely available in 15" or 13". 14" is a dead end that has been slowly dying over the past decade. 13s survive due to mini's and beginnner formula classes. 15s are doing well due to golfs, mx5s, e30s etc. Decent budget choices available in 15s through Federal or Nankang or Toyo.
If you want to lower the car through wheels (good idea) look towards 215-40-15 Avons. You could go 13, but then you might run into problems with the thermal capacity and clamping force of brakes that fit in 13s. Even the 280mm 15" setups are borderline if you know how to use 200whp at the track.

For rain tires -> Toyo R1R in 195-50-15. Closest thing to a wet-slick out there. Basically an SG compound R888 with added water channels.