Hey,
currently I have 17" S-lites, and the tread is practically gone. I will buy either 17" or 16" wheels and tires, and want to know that if I get the 16" will it tell me the incorrect speed? If you know please reply, also reply if you are selling your 16" or 17" wheels and tires. Thanks

 

Anyone?

 

If you switch to 16" wheels you will change your tire size so that the diameter of the wheel/tire stays the same. The 16" tire will have a bigger sidewall. If you don't do this, the speedo will be incorrect.

 

>>If you switch to 16" wheels you will change your tire size so that the diameter of the wheel/tire stays the same. The 16" tire will have a bigger sidewall. If you don't do this, the speedo will be incorrect.
>>
>>

I don't really understand what you are trying to say, so if you could find a way to tell it to me so that I will understand (which if you can't I can understand that it is probably hard) that would be helpful. Thank you for responding to me.
:smile:

 

There is a formula for finding out how much, percentage wise, a different diameter wheel will change your speedo an odo. Poke around online and you can find it cause i forget what it is off the top of my head.

What Ronvan said is right. Generaly the larger tire sidewall will cancel out the lost of wheel diameter. The tire wheel combo might still be slightly different then the 17 inch combo though so always try to make sure you go with a shorter wheel tire combo then taller that way it is like getting a deeper final drive gear.

As long as the speedo/odo change is less then 5 percent I would not worry about it.

 

if you switch to 16" wheels, you are going to want to get tires that will keep the overall diameter that you have NOW the same, otherwise your speedo will more than likely not be accurate. As long as you don't change the diameter of the wheel/tire combo, you're good to go. not sure what size tire will do that tho, sorry

 

>>if you switch to 16" wheels, you are going to want to get tires that will keep the overall diameter that you have NOW the same, otherwise your speedo will more than likely not be accurate. As long as you don't change the diameter of the wheel/tire combo, you're good to go. not sure what size tire will do that tho, sorry

Much better, thank you.
:smile:

 

here is the site with the tire calculator.

It can also tell you what your final drive will change too.

http://www.c5-corvette.com/tirecalc.htm

 

The height of the tire from the ground to the top of the tire should stay the same no matter which wheel size you pick, otherwise the speedo will be off.

So, if you change the size of the wheel from a 17" to 16" diameter you need to compensate for the inch by using a tire with a sidewall height which compensates for the difference.

If you look at the profile of a car with 17" or 18" rims you will see alot of wheel and little tire. Look at a car with 15" wheels and you see much more rubber.

Hope that helps! If it doesn't, I'm sure the guys in the tire forum can explain it better.

 

^^ Helps a hell of a lot, thanks :smile:

 

Moving to the Tire and Wheel forum. Alex is an expert on topics just like this.

Mark

 

Hi Super

Let me give you a few links . There are a few diagrams,and a very thurough explanation.

tire dimensions
plus sizing
spedometer calibration

Feel free to PM me anytime with questions

Alex

>>^^ Helps a hell of a lot, thanks :smile: