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 Jul 6, 2004 - 2:26 PM
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 Enthusiast  Joined Oct 24, '03 From fort smith, ar Currently Offline Reputation: 0 (0%)  |
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 --------------------  former celica owner. |
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Jul 6, 2004 - 2:28 PM
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 Enthusiast Joined Oct 22, '03 Currently Offline Reputation: 0 (0%) |
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.
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Jul 6, 2004 - 2:31 PM
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LIKE ME!!! haahha, no just kididng. Its notthat much of a diff
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Jul 6, 2004 - 3:30 PM
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 Enthusiast Joined Feb 25, '04 From Wisconsin Currently Offline Reputation: 0 (0%) |
i got 19's -
25mph = 26mph 60mph=63mph 80mph=85mph |
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Jul 6, 2004 - 5:05 PM
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Enthusiast Joined Jan 17, '04 From Illinois Currently Offline Reputation: 0 (0%) |
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. |
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Jul 6, 2004 - 5:32 PM
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Enthusiast Joined Feb 25, '04 From Wisconsin Currently Offline Reputation: 0 (0%) |
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 |
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Jul 6, 2004 - 5:59 PM
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Enthusiast Joined Jan 17, '04 From Illinois Currently Offline Reputation: 0 (0%) |
Actually, I think you meant "tire" not rim. The rims for each of these wheels are the same size. That is the whole point. You can use 17" rims with tires that are actually smaller in outside circumfrance than the stock tires on 15" stock GT rims. -------------------- 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. |
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Jul 6, 2004 - 6:05 PM
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Enthusiast Joined Feb 25, '04 From Wisconsin Currently Offline Reputation: 0 (0%) |
I meant tire and typed rim - its fixed now
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Jul 7, 2004 - 2:33 PM
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Enthusiast Joined Oct 24, '03 From fort smith, ar Currently Offline Reputation: 0 (0%) |
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. |
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Jul 8, 2004 - 4:15 AM
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 Enthusiast Joined Jun 18, '04 From Lincolnshire, England Currently Offline Reputation: 0 (0%) |
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  ).
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Jul 8, 2004 - 5:48 AM
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Enthusiast Joined Mar 4, '03 Currently Offline Reputation: 0 (0%) |
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.
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