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Calculation issue in Tire and wheels for DRAGRACE IS350 RWD

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Old 04-23-18, 10:43 AM
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KSAWHEELS
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Question Calculation issue in Tire and wheels for DRAGRACE IS350 RWD

Greeting,
I have 2014 IS350 RWD with some mod and I would change my rear tire and wheels to 17".
Current, I am running a TE37 19X9.5+35 Front and Rear.
I am going to change the rear to 17x 9 ( WORK EMOTION T7R) 17X9+38 with tires 17x45x245.( Drag Race tires )
Now the question is a 4 centimeter difference higher of front ( 19x9.5 with 35 tire tall ) & rear ( 17x9 with 45 tire tall).

Will this difference makes any bad result or any issue ? I want to run them 17" only in drag race night.

How that 4 CM come?
I will break it down here
front is 19x9.5 wheels which is 483 mm tall
tire is 35 mm tall
total = 518 mm for front

rear 17x9 wheels which is 432 mm
tire is 45 mm
total= 477 mm

difference is
518-477= 41 mm= 4 cm

Thanks all,
Old 04-23-18, 10:50 AM
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KSAWHEELS
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Question Calculation issue in Tire and wheels for DRAGRACE IS350 RWD

Greeting,
I posted it in wheels third but no view so I move it here
I have 2014 IS350 RWD with some mod and I would change my rear tire and wheels to 17".
Current, I am running a TE37 19X9.8+35 Front and Rear.
I am going to change the rear to 17x 9 ( WORK EMOTION T7R) 17X9+38 with tires 17x45x245.( Drag Race tires )
Now the question is a 4 centimeter difference higher of front ( 19x8.5 with 35 tire tall ) & rear ( 17x9 with 45 tire tall).

Will this difference makes any bad result or any issue ? I want to run them 17" only in drag race night.

How that 4 CM come?
I will break it down here
front is 19x8.5 wheels which is 483 mm tall
tire is 35 mm tall
total = 518 mm for front

rear 17x9 wheels which is 432 mm
tire is 45 mm
total= 477 mm

difference is
518-477= 41 mm= 4 cm

Thanks all,

Last edited by KSAWHEELS; 04-23-18 at 10:54 AM.
Old 04-23-18, 03:21 PM
  #3  
newgsman
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Your calculations are wrong. The number 35 and 45 are not tire height. They are used to calculate the tire height relative to tire width. Your 17" tire will have a sidewall height of 245 x 0.45 = 110.25 mm Your 17" wheel has a diameter of 431mm. Your total tire + rim has a diameter of 110.25+110.25+431 = 651.5mm

You didn't mention the width of your front tire so we can't calculate the front tire/rim diameter. Assuming you have 225/35/19 on the front, the total tire/rim diameter will be 640mm. The net difference will only be about 6mm which is negligible. You would be ok.
Old 04-23-18, 04:02 PM
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Bigjon3475
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Just want to add that if you want to convert mm to inches you use 25.4.
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