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Old 04-05-2014, 10:26 PM   #1
XTJG33
1968 XTGT
 
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Join Date: Apr 2010
Posts: 745
Default Tyre Height Question

Hi Guys,
I have a 1968 XTGT Replica with 4.11's in the rear running a 255/60/15 tyre (27 inches high). Last weekend i took it down the quarter and crossed the traps at 13.63 @ 99.84 mph @ 5100rpm. i was changing at 6100 and had a 1.912 60ft.
If i fitted a 26 inch high tyre, say 235/60/15, would i get a better 60ft time and ultimately and better 1/4 time. what rpm would i be crossing the line at?

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