i just got a set of 17's and i've heard that you have to get your speedo adjusted. where do you go to have this taken care of and is it possible that i can do it myself?
-Jeff
-Jeff
former celica owner.
former celica owner.
speedo - 6G Celicas Forums
former celica owner.
It will only throw off your speedo by a few miles 1-5 at the most. Your RPMs will feel different too. I dont think people really change or adjust their speedo unless its a major difference.
LIKE ME!!! haahha, no just kididng. Its notthat much of a diff
i got 19's -
25mph = 26mph
60mph=63mph
80mph=85mph
25mph = 26mph
60mph=63mph
80mph=85mph
Actually, the answer is "it depends". The key is not the size of the rim but the overall size of the rim and tire combined. For instance, a 205/55/15 tire will be the nearly identical in outside circumfrance as a 205/45/17. Thus, no change is the speedo is needed when going from 15" to 17" wheels. On the other hand, if you use 225/45/17 wheels, the speedo will be 4.1% too slow. Try a search on "miata" and you will find a tire size calculator to help you out.
QUOTE(lagos @ Jul 10, 2006 - 1:55 PM) [snapback]454118[/snapback]i know your trying to do the right thing for your motor, but this is one of those times where you should just trust the guys who have had their swaps for a while and have done a ton of research into this.
What J said might be a little confusing to some. I'll break down tire dynamics to everyone.
Stock tire
205/55/15
205 = # of millimeters from inner side wall to outer side wall
Divide this number by 25.4 to get inches (stock is a 8.07" tire)
55 = the height of the tread from rim to tallest tread
This is a % based off the section width. So 55% of 205.
The height for a stock tire is rought 113mm or 4.43 inches high.
15 = the rim size
This is confusing because most people think that the middle number (55) is an actual number in mm instead of a percent. This is why a 225/45/17 tire is taller than a 205/45/17.
Hope I helped.
This post has been edited by turboinduction: Jul 6, 2004 - 6:04 PM
Stock tire
205/55/15
205 = # of millimeters from inner side wall to outer side wall
Divide this number by 25.4 to get inches (stock is a 8.07" tire)
55 = the height of the tread from rim to tallest tread
This is a % based off the section width. So 55% of 205.
The height for a stock tire is rought 113mm or 4.43 inches high.
15 = the rim size
This is confusing because most people think that the middle number (55) is an actual number in mm instead of a percent. This is why a 225/45/17 tire is taller than a 205/45/17.
Hope I helped.
This post has been edited by turboinduction: Jul 6, 2004 - 6:04 PM
QUOTE(lagos @ Jul 10, 2006 - 1:55 PM) [snapback]454118[/snapback]i know your trying to do the right thing for your motor, but this is one of those times where you should just trust the guys who have had their swaps for a while and have done a ton of research into this.
I meant tire and typed rim - its fixed now
well, my tyras are 205/40/17 and i had whatever stock tire size is on an ST. i'm still confused though...
former celica owner.
Here's a good size calculator.
When i changed my wheels and tyres from 205/55/15 to 215/35/18 it only made a difference in diameter of 1mm (that's less than 1/16" to you guys >
> ).
When i changed my wheels and tyres from 205/55/15 to 215/35/18 it only made a difference in diameter of 1mm (that's less than 1/16" to you guys >
> ).
dstrb since no one has told you, you CAN get your speedo recalibrated. It's up to you if you do it, I will probably do it when I change wheels because I am a bit of a perfectionist and it's cheap. If you look in a phonebook you should be able to find a place that does it. Check under autmotive repairs for 'speedometer recalibration' or something like that. There is usually at least one place that does this in every town/city.. as there are always big contracts with government agencies etc.