 Speedometer is off, I just changed my tires.... |
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 Feb 26, 2003 - 10:22 AM
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 Enthusiast  Joined Sep 29, '02 From Sterling Heights, Michigan Currently Offline Reputation: 0 (0%)  |
Ok I need some info any of you guys/gals can give me. I just recently changed my tires bcus I wasn't getting any traction or handling on them during this winter season. Plus they were getting bald. I went from a 205/50R/15 to a 205/50R/15 and I read that your speedometer may be off?? SO I was wondering if anyone would know how to calculate how much I lost going to a lower radial?? Doing 80 on the freeway seems like i'm only going 70-75mph or doing 25-30mph doesn't seem like the actual speed either.
I got Yokos on them I was supposed to get Toyos ....long story....but regardless the handling and cornering on them is a lot smoother than my old worn out tires. Could it be that I'm just getting used to the new tires? |
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Feb 26, 2003 - 11:04 AM
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 Enthusiast Joined Jan 29, '03 From Texas Currently Offline Reputation: 0 (0%) |
dude you realise that you said you went from one tire to the exact same tire
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Feb 26, 2003 - 11:06 AM
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Enthusiast Joined Sep 29, '02 From Sterling Heights, Michigan Currently Offline Reputation: 0 (0%) |
Ohhhh oops..mah bad. I ment I had a 55R then went to a 50R. SOrry...i didn't realize it.
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Feb 26, 2003 - 11:13 AM
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Enthusiast Joined Sep 29, '02 From Sterling Heights, Michigan Currently Offline Reputation: 0 (0%) |
Ok well I think I mighta figured it out. I think the speedo differs when/if I'd be going to a bigger rim size. But since I'm still on 15's then maybe I'm just off by maybe 1 or 2.
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Feb 26, 2003 - 12:05 PM
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Enthusiast Joined Sep 27, '02 From UK Currently Offline Reputation: 1 (100%) |
205x50x15 is the standard size so your speedo reading should be pretty accurate.
However, if you went for 205x55x15 then the speedo will be out but not by much. (sorry not sure how to calculate this). |
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Feb 26, 2003 - 3:34 PM
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 Enthusiast Joined Oct 12, '02 From New Jersey Currently Offline Reputation: 0 (0%) |
Speedometer reading : stock tire is 3.5% too slow..when your speedo reads 60 mph you are actually traveling 62.1
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Feb 26, 2003 - 4:09 PM
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Enthusiast Joined Sep 29, '02 From Sterling Heights, Michigan Currently Offline Reputation: 0 (0%) |
I found out that with the new tires on (50R's) that I'm going 3.29% Fast.
My friend told me to go to 7thgencivic.com and they had a Tire Size Calculator on their site. going 60mph x 0.0329 = 1.974 So like 2 miles over... |
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Feb 26, 2003 - 4:53 PM
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 Enthusiast Joined Feb 11, '03 From Phila, PA Currently Offline Reputation: 0 (0%) |
Check this out to calculate any size changes... http://www.miata.net/garage/tirecalc.html
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Feb 26, 2003 - 5:03 PM
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Enthusiast Joined Sep 29, '02 From Sterling Heights, Michigan Currently Offline Reputation: 0 (0%) |
LOL ok I was told that also. Man seems like all of these tire calculators vary. It's hard to tell which is accurate.
Thanks for the link Mild. 
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Feb 26, 2003 - 11:53 PM
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Enthusiast Joined Oct 12, '02 From New Jersey Currently Offline Reputation: 0 (0%) |
that's what i used |
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Mar 7, 2003 - 8:02 AM
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 Enthusiast Joined Sep 5, '02 From Phoenix, AZ Currently Offline Reputation: 0 (0%) |
Just set your cruise for 60.
When you hit a mile marker, start a stop watch. In exactly 60secs your should pass the next marker. If you don't then use D=T/V to figure your speed. (i think that's the formula) 
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Mar 7, 2003 - 3:45 PM
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Enthusiast Joined Sep 29, '02 From Sterling Heights, Michigan Currently Offline Reputation: 0 (0%) |
I don't have cruise...my ST didn't come with one!
 Thanx for the info though... |
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Mar 7, 2003 - 9:22 PM
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Enthusiast Joined Oct 12, '02 From New Jersey Currently Offline Reputation: 0 (0%) |
stupid ST's lol
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Mar 11, 2003 - 7:18 PM
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Enthusiast Joined Sep 5, '02 From Phoenix, AZ Currently Offline Reputation: 0 (0%) |
My ST came with it, so
 for me!
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Mar 12, 2003 - 12:17 AM
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 Enthusiast Joined Oct 15, '02 From Rochester, New York Currently Offline Reputation: 0 (0%) |
http://www.c5-corvette.com/tirecalc.htm
one more calculator;). I like because it also shows the odometer error, which is nice. This post has been edited by Zoom: Mar 12, 2003 - 12:19 AM |
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Mar 12, 2003 - 10:06 AM
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Enthusiast Joined Sep 29, '02 From Sterling Heights, Michigan Currently Offline Reputation: 0 (0%) |
I actually like that site better! It's got more info than the other sites I've gone to. Thanks Zoom.
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Mar 12, 2003 - 2:25 PM
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 Enthusiast Joined Aug 29, '02 From Dallas, Tx Currently Offline Reputation: 0 (0%) |
Even with the stock size tires its still not very accurate. I've got GPS thats accurate to 0.1mph. Even with the stock size tires and wheels its about 4% off.
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Mar 15, 2003 - 12:15 PM
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Enthusiast Joined Oct 12, '02 From New Jersey Currently Offline Reputation: 0 (0%) |
That website made things a lot easier to understand, thanks
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Mar 24, 2003 - 8:48 PM
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Enthusiast Joined Nov 26, '02 Currently Offline Reputation: 0 (0%) |
wow only 1.6% off with gts rims =)
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Mar 25, 2003 - 7:19 PM
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Enthusiast Joined Oct 15, '02 From Rochester, New York Currently Offline Reputation: 0 (0%) |
SpedToe, with stock, is 4% off a high or low reading?
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