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Speedo with 275/40/17

Old 02-18-2008, 09:39 PM
  #1  
StangEatsRice
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Default Speedo with 275/40/17

Will it be off? How much? I am tuning the car in april for 4.10's with a sct but will i be able to set it up so the car knows there 275/40 in the rear and 245/45 in the front? I need the tires now.
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Old 02-18-2008, 09:44 PM
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dpstang98gt
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Default RE: Speedo with 275/40/17

it will not be off very much if its any at all
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Old 02-18-2008, 09:45 PM
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StangEatsRice
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Default RE: Speedo with 275/40/17

does the rear even have a speedo thing i think it may only be for the front? If thats the case would the car even realize the diff tire size in the rear.
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Old 02-18-2008, 09:52 PM
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72MachOne99GT
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Default RE: Speedo with 275/40/17

274/40's and 245/45's are both right around 26.6inches tall I belive..

You'll be fine as far as teh speedo is concerned. And even if you had a differnet size, im sure the programmer will allow for tire height changes if you were going to DD a 28" slick ;-)
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Old 02-18-2008, 09:56 PM
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brock_07
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Default RE: Speedo with 275/40/17

ORIGINAL: StangEatsRice

does the rear even have a speedo thing i think it may only be for the front? If thats the case would the car even realize the diff tire size in the rear.
i think the speedo thing is in the tranny cause if it worked on the front wheels u wouldnt have to fix ur speedo with a gear change.
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Old 02-18-2008, 10:09 PM
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Black_GT_02
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Default RE: Speedo with 275/40/17

You won't notice any difference with 275's.
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Old 02-18-2008, 10:25 PM
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dougs97mustang
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Default RE: Speedo with 275/40/17

my 97 is off 10 mph but i dont know if it is for that reason, it says im going 70 when im realy going 60. It realy racks up the miles[:@]
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Old 02-18-2008, 10:46 PM
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Black_GT_02
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Default RE: Speedo with 275/40/17

You probably have gears...i'd say 3.73's
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Old 02-19-2008, 03:17 AM
  #9  
oxfordgt
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Default RE: Speedo with 275/40/17

The diameter of the 245/45 is 25.68in and the diameter of the 275/40 is 25.66 so when your speedo says your doing 65 you are atually doing 64.95. Dont worry about a recalibration
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Old 02-19-2008, 10:29 AM
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72MachOne99GT
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Default RE: Speedo with 275/40/17

25.6 26.6.. bagh, same thing.. lol

Even if it were different though, I'm certain SCT , and other tuners for that matter could take into account a tire change.
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