so i have an option to trade my stock rims for some white 17x7.5 te-37 with 235/45/17

good deal or no

 

It seems like an alright deal. But you do have to consider the tire sizes. With the new wheel/tire combo your speedometer will read 2.4% faster, with a 245/45/17 it will drop to 1.1% faster and with a 255/45/17 there is no difference. If you don't mind the speedo being off then you should be fine. With that being said, when the speedo runs faster than you are really going it will put more miles on your car then you have actually driven. In the end its up to you.

 

well they already have new tires... i could go 245/45... that seems good for an 8 wide rim... but i dont want too much meat/hieght of the tire off the rim... 1.1 off really does not seem that much.. and 255/45 will be some dam tall tires...


so where is the sensor for milage front or back?????

i could go 245 up front and 255 rear... any thoughts...

the car has 22k mileage.. its an 04 i have a 7 year 100k mile warrenty... i dont drive it that much anyways..

but what i want is the best tire size for the 17x8 rim...

 

As far as the sensor question, I think it is in the trasmission but I could be wrong. I would use the 235 tires for the time being since they are new and get some 245/45 when the time comes to replace them. I am using 245/40 on my stock wheels and I like it, the speedo is a little off but nothing to worry about. Since you have an extended warranty I wouldn't worry about mileage too much. Also, you should find out if the new wheels have TPMS sensors installed, you might want to swap them from the stock ones unless you don't care about the light.

 

You can use those on the track. They're light, they'll lower you car and lower your gearing (more RPM at the same speed.
But don't use them on the street; get yourself a set of street rims and tires if you want this deal.
You need to maintain diameter to keep you speedo right and you need the same diameter front and rear to keep traction control happy.
On 17" wheels you need 225-50-17 for correct diameter.

 

That is another good point about the Traction Control. But would it affect it even though the wheels are all the same size?

I'm running 245/40/18 on my stockers and DSC/TCS haven't been affected even though the diameter is 1% less than stock.

 

225/50 that seems close to 245/45.. these will be my only set... the new tires are not installed and i have the option to put the tpms on the volks if it fits..

i dont want too much hieght in the tire, i would prefer the 45 on the 245 to give its hieght instead of the 50 series...

the car will also be lowered on tien springs.. (0.3) in back and (1) in front...

i suggested useing 235/45 because they are brand new... but they are not installed on the rims yet...

so i can still decide what are the best overall tire size...

it looks like bald 225/45/18 are the same diameter as 235/45/17 brand new when compared side by side..

i would prefer more grip driving not drift... i dont care what is popular right now.. i would rather enjoy the car what what it is.. a really nice ride that i dont want to have an accident in

 

volks ftw

 

No. TCS doesn't know if your wheels are different size than stock, it only gets messed up if it thinks the front wheels are spinning faster than the rears and vice versa.

 

so ive decided.. im getting 245/45/17

this pretty much matches 225/45/18... in diameter...

thanks everyone

 

Just so you know, since I saw you mention that these wheels were 7.5" in another thread, but that they measure to 8", those are actually 7.5" width one. Lip to lip I'm sure they measure 8", but a wheel's width is measured from where the tire bead sits and I think if you measure that you'll find they're 7.5" width. Personally I wouldn't put on a wheel that's narrower than stock except for snow, but it's your choice.

 

i did measure from the bead line its like 7 and 3/4

also... im getting a hell of a deal.. i mean common you guys.. im getting volk te-37 for my stockers... im making out no matter what.. i am not racing the car... and 17x7.5 will be just fine with 245/45/17...

i dont need to be critical.. im not a professional race car driver... im not going to drift.. im not going to be pushing it to where my coffee will spill...

seriously, i doubt that it will make that much of a difference... im sure ill have more grip then the "factory" tires anyways....

look at all the jgtc cars, and f1 cars... they have meatty tires.. i think low profiles are easier to break traction with for drift ... im more of a grip driver..

well ill take photos when its all done..

thanks for everyones comments, all is appriciated and taken note of..

p.s. LionZoo... yeah i dont know why i was putting 17x8... there are rated at 17x7.5 but they did measure over at the bead line... ill take a photo...hehehehe

ben

 

Your grip, and the relationship it has with wheel width as well as tire width, is a huge black art. There's no simple model that can predict tire grip though there are rules of thumb. Generally, a wider tire will give more grip, but that falls off when your wheel starts becoming too narrow for the tire. For a 245/45, a 7.5" width wheel is right at the narrow edge of what tire manufacturers recommend for fitment. At that wheel width, steering responsiveness will probably decrease, your ultimate lateral grip will change a lot less than you suspect, AND that limit will be harder to get to. I'd rather run a 225/50 tire on a 7.5" width to be honest, but I seem to be one of the few that prefers a bit more support for the sidewall rather than stuffing as much tire as I can get onto a wheel. For a 245/45, I like Spin9K's solution of running a 17x9" wheel, but I know that's not on your list of options.

With your race argument, you forget that race series have regulations. For F1, they use lots of sidewall on their tires because the FIA makes them. If they were allowed, I'm sure they'd run less sidewall. Most racecar engineers on smooth pavement tend to run very little sidewall to improve a car's responsiveness. WRC cars for example, go right to limit of sidewall allowance on tarmac by running large diameter wheels and very little sidewall on tarmac, but will scale back to a smaller wheel and more sidewall on non-sealed surface events.

 

i understand everything your saying, but i didnt forget anything... i just didnt know about f1 regulations.....

and for my application.... my options are limited..

my friend only has 17x7.5 for trade... so all i have to do is get tires...

they are te-37's so ill be happy to get them.. for everyday driving i will be fine...

this tire size is also recommend for the 7.5 (even though on the outter limits)

1. im not going to race the car
2. im not going to drift the car
3. im getting better rims then stock
4. the tires are still recommended by manufacturer...

"i am still within spec"

anyways on the other note...

if i were serious about pushing the car to the limits of my ability to drive... see how i worded that because i am honest about myself and i know i will not have the time or place to learn to push the car to its limits...(takes a professional driver to do that)...lol

anyways yeah if i were to push it... i would follow your advice on tires and rims for racing..... since you (lionzoo) know more about it then me... not sarcasim.. i recognize your knowledge

not gonna argue with you... but common.... you gotta admit

im gettin some better rims and i just want the damn speedo to be correct without havin too tall a tire... and i think ill be good with that

brand new 235/45/17 came with em... but i wanted the speedo to be more correct so i went with the 245/45/17

believe me... i would love to put wider rims.. but who would be willing to trade 18x8 or 17x8 te-37's for stock rims... im sure no one...

so im taking what i can get...... its a helluva good deal.. and thats what i have to work with..

well thanks for the education on the tire stuff.... i saved it so when i want to get a "performance set-up" ive got this thread to look back on...

and i only mentioned grip because im not going to try and drift around on/off ramps and risk screwing up my car...

well thanks everyone...

ben

 

One thing you might want to do is run a test fitment of the wheel first before you trade your friend. It seems you're either going for style or "because they're Volks". If it's style, you might not actually like the look of the RX-8 with 17" wheels. Of course if you're getting them simply because they're Volks, more power to you.

 

bro, i know im not going to be totaly satisfied, but yes im doing it more for looks... and because there volks... my old rims which were never used.. and i did do a test fitment... it looks good enough.. even better once i lower the car an inch max.... going with tien.. tein.. whatever..

but yeah.. its more of like a good deal thing..

this is not being done for optimal performance.. more for style

so why are you up...lol

i work graveyard..

anyways hit me up.. bwmeeker@hotmail.com msnmsngr