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Old 12-30-2005, 03:42 AM   #1
420-Rex
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Default Tire question...215/35/18

These tires seem kinda small, Rubber bands! So what do yall think about these on an 03rex. They probably have really good grip though... Just tryin to get some info on em, kinda got a set for free.
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Old 12-30-2005, 03:49 AM   #2
svek
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24" tall...not sure on the stock size of the wrx tires but i know my L was 24.2". so it looks like they are going to be a little smaller than normal...and thats not a tall sidewall at all...uncomfortable ride and if you go fast enough around a corner i can imagine you hitting the rim. no way we would know how grippy they are without knowing what kind of tire it is.
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Old 12-30-2005, 08:39 AM   #3
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What size wheel are they going on? Giant waste of time to put them on a 8 or 8.5" wheel as I have seen people doing recently. A crappy tire in that size will cost more and grip less, and ride like poop, compared to a good tire, even on the stock 16" wheels.

^^^^Depends what tire it is.
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Old 12-30-2005, 08:50 AM   #4
Luke@tirerack
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the 215/35-18 is 23.9" in overall diameter and either a 94 or 80 load index.

So, let's look at the facts:

the 94 load index has a maximum load capacity of 1102 lbs. and the 80 load index has a max capcity of 992 lbs.

A P-Metric tires max load is achieved at 35 psi and a Euro metric tires max load is achieved at 36 psi adding more air pressure will not increase the tires load capacity but, lowering it will reduce the load carrying ablility. When increasing pressure all you are accomplishing is a lower rolling resistance, quicker steering response, stiffer ride and contact patch reduction.

Based on a WRX:
the OE tire is a 205/55-16 89V
max load capacity is 1279 lbs.
load capacity at recommended pressure (which we will call PLC for placard load capacity at 32psi) = 1213 lbs.

so the minimum load capacity for a WRX is 1213 lbs. according to the PLC

now if you look at the optional tire "OK'd" by Subaru
215/45-17 87W
max load is 1201
PLC = 1135

so in reality the minimum load capacity is 1135 lbs.

now lets consider the idea of running a capacity that is too low .... what happens:
the tire is put into a condition where it can support the car at a static rest point but, when driven aggressively the sidewalls are so over worked they can not properly control the contact patch of the tire allowing for excessive sidewall roll-over, irregular wear tread block and contact patch flex which robs the tires performance ability and grip. also the added flexing of the tire will increase the heat it generates which can make a tire feel really slippery .... better gear ratio is achieved but if you can't utilize the power it doesn't matter ....

A good way to understand this is: let's say I just put a 100lb. back pack on you .... you can stand there for quite a while (that's your car sitting in a parking lot) now go run up and down some stairs with that back pack .... that's normal driving and you can't do that very well, nearly as fast or for very long before your legs give out .... after you've recovered enough to walk (let the car rest once you arrive at the venue for your autoX), take a 500 meter sprint through deep sand, that's your autoX and you will most likely not make it to the finish without falling atleast once if you can finish at all.

so, NO, it would not be a good idea to run the 215/35-18 tire size
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Old 12-30-2005, 02:11 PM   #5
EDM
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I say the best size for a sedan is a 225/40-18. It is a good size cause it will fit a 7.5" to 8" wheel.
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Old 12-30-2005, 03:48 PM   #6
420-Rex
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Cool thanks alot guys. Like i said they where free, friend works at a tire shop. Oh well. Guess ill sell em or something. Its just a crappy tire size then eh? For the rex anywayz... Cant remember the name of the tire either. Have to look, but my friend said they gripped extremely well...but screw that after i read that long thread. Dont want no rim damage cause of tire roll. Anyone wanna buy these
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Old 12-30-2005, 09:16 PM   #7
jland67
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I run a 235/40/18 and its a little bit taller than stock.


Jeremy
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Old 12-30-2005, 09:40 PM   #8
Evil STI
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Yeah, get dem yo!!!!
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