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Old 11-19-2009, 06:42 PM   #1
drkllr
 
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Drives: 2010 Hennessey HPE 650 H.O ABM m6
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rear tire sizes

I have 275/40 r 20. I would like to go to a wider tire on same rim. Does anyone know how i can figure out what size i can go to without changing my speedometer ratio.
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Old 11-19-2009, 06:44 PM   #2
rolnslo
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You might find this site helpful: http://www.tiresizecalculator.info/
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Old 11-19-2009, 06:47 PM   #3
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A Hennessey HPE 650 has just 245/40 R 20? That's roughly the RS package front tire, 245/45/R20, with the back being a 275/40R20. Are you sure that's what you have on the back?


http://www.tiresizecalculator.info/guide.php

Good calculator!

rolnslo ain't so slow, lol....
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Old 11-19-2009, 09:35 PM   #4
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thank you
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Old 11-19-2009, 09:43 PM   #5
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Second question it appears that i can avoid throwing speedo off some. Is there a way to reflash it to match
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