04-06-2012, 09:26 PM
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#1 (permalink)
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Enthusiast Member
Join Date: Dec 2010
Location: H-Town
Posts: 378
Drives: Too slow
Rep Power: 15
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Quote:
Originally Posted by cjr1881
You need to keep the total circumference of the tire the same or you will change your gearing. He has effectively shortened his gearing and will now take more rpms to achieve the same speed. The profiles for 19" tires on the 370Z should be front/40/19 rear/35/19. His are F/35/19 R/30/19 . When his speedometer says he is doing 60mph, he will actually be doing about 50mph. 17-18% off. I can't believe how many cars I see with the wrong profile tires. People are obviously oblivious to the fact that they are not just changing how the tire looks. If you plus size you need to change aspects accordingly, and if you keep same wheel size then you must keep same aspect or you will be changing gearing and your speedometer.
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17-18%?!??! What are you smoking?
@ 60mphs, his speedometer will be off about 1 1/2 mph, resulting 61-62 mph
Do the math Tire size calculator
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