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http://www.1010tires.com/TireSizeCalculator.asp
It even shows you what your tires will look like vs. stock... pretty nifty.
It even shows you what your tires will look like vs. stock... pretty nifty.
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2002 Silver Metallic A4 Firebird - All Options
Hotchkis STB, Custom Madrel Bent 3" Exhaust, Pacesetter Headers, Whisper Lid, FT Ram Air, K&N Air Filter, D2S HID, Baer Rotors, !EGR, !MAF, 10% tint, Parrot CK3300
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2008 Saturn Sky Red Line - Midnight Blue
Pewter Mafia - 2000 Firebird - SOLD
CENTRAL FLORIDA KNIGHTS!!!!!!!
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hmm going from 235/55/16 to 275/40/17 only changes the speedo from 60mph to 59mph? id think it would be more than thatComment
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"hmm going from 235/55/16 to 275/40/17 only changes the speedo from 60mph to 59mph? id think it would be more than that"
Thoughts like this are why, while having the calculator is nice, knowing how to do the calculation yourself is much nicer.
Here's how it works for 235/55-16. The tread width is 235mm. The sidewall height is 55% of the tread width. So the sidewal heigh is 129mm. 25.4 mm to the inch, so the sidewall height is 5.1 inches. The diameter of the tire is 2 sidewall heights plus the 16 inches for the wheel or 26.2 inches.
Do the same calculation for the 275/40-17 and you'll get 25.7 inches. So the overall difference in diameter is 0.5 inches in about 26 inches or about 2%. So the speedo is gonna be 2% different and the 275s will read faster (smaller tire).2000 Firebird convert, chameleon/tan, M5, Y87, TCS, BMR tower brace and panhard, KBDD sfcs, 245/50-16 GSCsComment
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nice going bob!-Hawk<br /><br />===================================<br />Black 2001 Pontiac Firebird<br />Automatic Transmission Street Bird<br /><br /> <a href=\"http://www.cardomain.com/memberpage/550453\" target=\"_blank\">http://www.cardomain.com/memberpage/550453</a> <br /><br />\"Live like you were Dying\"Comment
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Not bad, but the dimensions are not to scale. The sidewall height never changes, the picture just gets bigger. Same for the width.
1994 Firebird 3.4<br />15.65 @ 86.8<br /><a href=\"http://www.funkz.net/firebird.htm\" target=\"_blank\">funkz.net/firebird</a><br /><a href=\"http://mywebpages.comcast.net/funkz/timeslips.htm\" target=\"_blank\">Timeslips</a>Comment
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bahh that too much work jsut take a GPS with you and check your speed with it... like it do lol... much easier at 60 my GPS 60-61 1 MPH is fine for meOriginally posted by V6Bob:
"hmm going from 235/55/16 to 275/40/17 only changes the speedo from 60mph to 59mph? id think it would be more than that"
Thoughts like this are why, while having the calculator is nice, knowing how to do the calculation yourself is much nicer.
Here's how it works for 235/55-16. The tread width is 235mm. The sidewall height is 55% of the tread width. So the sidewal heigh is 129mm. 25.4 mm to the inch, so the sidewall height is 5.1 inches. The diameter of the tire is 2 sidewall heights plus the 16 inches for the wheel or 26.2 inches.
Do the same calculation for the 275/40-17 and you'll get 25.7 inches. So the overall difference in diameter is 0.5 inches in about 26 inches or about 2%. So the speedo is gonna be 2% different and the 275s will read faster (smaller tire).www.turbov6camaro.com
1997 3800 Series II Camaro
4600 Stall for my ride to the mall :chug:
7.18 @ 99.77 1/8 -1.8x sixty (current quickest v6 fbod)
11.23 @ unk 5 1/4 - 7.19 1/8 - 1.83 sixty
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its not like you can tell the difference between 60 and 61 on the speedo anyway.. maybe 60 and 62Comment
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There is also this one, which is just as good or better. ;)
http://www.saturnperformance.com/tech/tiresize/Jordan<br />15.09@90.7<br /><a href=\"http://www.fullthrottlev6.com/forums/vbgarage.php?do=view&id=21\" target=\"_blank\"><b>1995 Camaro 3.4 M5</b></a>Comment
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yeah that ones alot easier to understand, thanks [img]smile.gif[/img]Comment
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