tyre question.??
#1
tyre question.??
i have the stock tyres which comes with the auto the 16 inches one. now i have 245 18 inch tyres and i like to know that will this effect the speedometer reading or not. as if the meter is showing 100 than will it be 100 or a little faster than than that. thankx
#2
Extraordinary Engineering
As long as your 245-18 has a profile of 40 then the speedo will be within a few percent of correct. What wheels did you get? (width and offset, post pics)
What's your location?
What's your location?
#6
Registered Zoom Zoomer
iTrader: (2)
16" stock? I didn't know there was such a thing. Anyway, you'd have to a much more dramatic alteration of the diameter of the wheel and the height of the tire to have any notable effect on the speedometer/odometer. As we know, the number after the slash in the tire size schema is the sidewall height; e.g. my stock 225/45ZR18 or potential 245/40ZR18. In my case going from 45 to 40 profile is negligible from a speedometer/odometer perspective.
Going from a 16" wheel to an 18" is of course more significant than altering your tire sidewall height.
With a larger than stock diameter wheel/tire height you will be going slightly faster than your speedomenter reading as you will be covering a slightly greater distance with each revolution (larger circumference). It's a Pi x Diameter thing.
All quite academic and nothing to worry about.
Going from a 16" wheel to an 18" is of course more significant than altering your tire sidewall height.
With a larger than stock diameter wheel/tire height you will be going slightly faster than your speedomenter reading as you will be covering a slightly greater distance with each revolution (larger circumference). It's a Pi x Diameter thing.
All quite academic and nothing to worry about.
![Wink](https://www.rx8club.com/images/smilies/wink.gif)
#7
2005 Black RX-8 GT 6M
Join Date: Jul 2006
Location: San Jose Area
Posts: 6,350
Likes: 0
Received 0 Likes
on
0 Posts
#12
Huh, first productive topic posted by zainanwar. Good job!
https://www.rx8club.com/rx-8-discussion-3/rx8-vs-hyundai-coupe-help-133824/
https://www.rx8club.com/rx-8-discussion-3/quarter-mile-question-134054/
https://www.rx8club.com/rx-8-discussion-3/short-shifter-134168/
https://www.rx8club.com/rx-8-discussion-3/standard-power-vs-high-power-133878/
https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/0-60mph-times-128629/
https://www.rx8club.com/rx-8-discussion-3/rx8-vs-hyundai-coupe-help-133824/
https://www.rx8club.com/rx-8-discussion-3/quarter-mile-question-134054/
https://www.rx8club.com/rx-8-discussion-3/short-shifter-134168/
https://www.rx8club.com/rx-8-discussion-3/standard-power-vs-high-power-133878/
https://www.rx8club.com/series-i-aftermarket-performance-modifications-23/0-60mph-times-128629/
#15
thankx guys. actually i love my car very much so i keep on asking stupid questions just to know every little thing abt my car. i am sorry if any of u find my questions stupid.
#17
I don't buy Kool-Aid
![Smile](https://www.rx8club.com/images/icons/icon7.gif)
You'll be ok. I have the same set up, 245/45/18 and I have a 04' AT that had 16" wheels.
Thread
Thread Starter
Forum
Replies
Last Post
garethleeds
Europe For Sale/Wanted
6
11-19-2015 06:32 AM
neoksk
RX-8 Parts For Sale/Wanted
3
09-21-2015 12:31 PM
yankeepicker
Series I Trouble Shooting
3
09-11-2015 05:42 PM