01transam

WS6 rims and a 285-40-17 tire?

Anyone have these on a factory rim? Any issues with clearance? Even better any pics?

ZaneO

Just curious why you want that size? They fit fine on a factory rim, but will change your overall wheel/tire height and mess up your speedo, odometer, and slow you down a little bit.

275/40/17 = 25.7"
285/40/17 = 26.1"

01transam

Just a little wider looking and only cost $20 bucks more for the set. Not a huge deal to me just wondering how they would work. I understand that it will mess up the speedo but I dont use it anyway I just drive I also think it will give a little more traction????

ZaneO

IMO, the traction difference is negligible. Not worth messing everything up. Those tires will grip very well in a 275/40/17.

02Hawk502

Where did you get those tire height figures? Technically, the 285 is only going to be 4 mm higher than the 275, which isn't .4" difference.

ZaneO

275mm x .40mm = 110mm x ~.04 inches = 4.4 inches x 2 = 8.8 inches (tire) + 17 inches (wheel) = ~25.8 inches

285mm x .40mm = 114 mm x ~.04 inches = 4.56 inches x 2 = 9.12 inches (tire) + 17 inches (wheel) = ~26.12 inches

Check it out for yourself - Look up the specs on those tires. It gives you revolutions per mile and overall diameter.

Where did you come up with your figures?

02Hawk502

Maybe I'm just off on my tire specs...what is the ~.04" in the equation for? Sorry if I'm slow...just trying to understand. My job doesn't involve this kind of stuff, so I'm kinda rusty haha

ZaneO

1mm = approximately (~) .04 inch

01transam

The whole thing I was wondering is if they would fit without hitting anywhere. Thats about it! I really can care less about the speedo. So everyone will agree that they will fit with no PROBLEMS!!

ZaneO

Sorry to have helped you too much. So, are you going to tell someone that your odometer is off when you sell the car?

02Hawk502

I think our differences are coming b/c of the conversion factor you are using. When converting to inches from mm, multiplying it by .04 isn't very accurate, since you aren't carrying the numbers out far enough. However, look at my method and tell me what you think, since converting mm to cm to inches is exact, since 25.4mm=2.54cm=1inch exactly.

275mm*.4mm=110mm sidewall; 110*2=220mm(total tire in height); 220+431.8mm (17"(wheel diameter)*25.4(25.4mm per inch)=431.8mm)=651.8mm; 651.8/25.4=25.66 inch height of a 275 series tire on a 17" wheel.

Following the same format as above:
285mm*.4mm=114mm sidewall; 114*2=228mm; 228+431.8=659.8mm; 659.8/25.4=25.98 inch height of a 285 series tire on a 17" wheel.

This being done, there is only a .32 inch height difference between the two, which results in roughly a 1 inch circumference difference (using 3.1412 as pi). I do not think that 1 inch is going to affect the speedometer that much, but then again, I don't want to run through those figures right now either

Run this through yourself and see what you think. Like I said, I just don't think your conversion factor produces an accurate enough number, which throws the entire equation off.

02Hawk502

They will fit w/o a problem!

ZaneO

My numbers follow perfectly with the manufacturer's specs, but both are close.

01transam

First off I never plan on selling the TA and second people change the tire size all the time. The difference will probably not even one mile over the next 5 years. And guess what as they wear they will become the same hight???? does that make you feel better?

ZaneO

It's cool man...sorry to put useful information in your post that other people may read.