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#1
03-20-2009, 11:41 PM
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Front tires
OK, OK, I know I killed you on the phone today...
 As I was looking over the car on the lift I noticed the front tires are pretty dry rotted and they need to be replaced. They are Dunlop 165 15 86s sp20 A/S metric's. Now I did a little homework and they are rated to 114 mph...Yikes! Now if I have 28x 10.5 15's in the rear, should I be putting say a 27 x 4.5 M/T's ET Front up front? I think the 165 15 tire was @ 25.4" tall. Should the front tire be close to the height of the rear tire for drag race purposes?
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87 GN, RPE built 109 stroked, RJC girdle, billet main caps, custom comp roller cam, Champion ported aluminum heads, Champion aluminum intake, T&D 1.65 rockers, 96 lb injectors, Accufab 70mm throttle body RJC pullies, RJC A/C bracket,GTK-850, ATR headers,Deeds electronic boost controller, Cotton’s 4 inch down pipe w/ Turbonetics RG 45 gate, XFI, Cotton’s front mount, Level 10 built 400 trans w/brake, Converter? ,33 spline Moser axles, Spool, HR bar. New best 9.44 @ 143! 
Last edited by trbochrgd1; 03-21-2009 at 12:06 AM. 
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#2
03-21-2009, 02:43 AM
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Mike, I've been using some P215-75-15 radials in front for a long time with some rear slicks about the same size you have (Phoenix 10.5 x 28.5).
Hope this helps... Claude.
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1987 Buick Grand National 9.70 e.t. @ 139.35 mph 1971 Chevelle SS 2008 Ford F-350 Crew Cab Dually 2012 Lincoln MKX
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#3
03-21-2009, 12:57 PM
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Quote:
Now I am going to highjack my own thread.. Your 215-75-15's are about 27lbs each. Going to a set of skinnies in the front would lighten your front end up some. You would drop about 28lbs off the front end buy switching to the M/T ET front's (@ 13 lbs). Then the narrower rims you would need to fit those tires would lighten it up even more! I know, all it takes is money And I'm not sure you want that route because you still do a fair amount of street/highway driving, right?
__________________
87 GN, RPE built 109 stroked, RJC girdle, billet main caps, custom comp roller cam, Champion ported aluminum heads, Champion aluminum intake, T&D 1.65 rockers, 96 lb injectors, Accufab 70mm throttle body RJC pullies, RJC A/C bracket,GTK-850, ATR headers,Deeds electronic boost controller, Cotton’s 4 inch down pipe w/ Turbonetics RG 45 gate, XFI, Cotton’s front mount, Level 10 built 400 trans w/brake, Converter? ,33 spline Moser axles, Spool, HR bar. New best 9.44 @ 143!
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#4
03-21-2009, 01:32 PM
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All I can say is ..... get rid of the car tires.. definitely purchase the race tires up front. Car tires with 100mph speed ratings are dangerous. Also, street tires will carry the water out of the water box...
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Jack Cotton Cottons Performance 413-789-0531
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#5
03-21-2009, 03:34 PM
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Quote:
OK, I'll go with the 27.5 4.5 15's M/T's ET Fronts. Thanks. 
__________________
87 GN, RPE built 109 stroked, RJC girdle, billet main caps, custom comp roller cam, Champion ported aluminum heads, Champion aluminum intake, T&D 1.65 rockers, 96 lb injectors, Accufab 70mm throttle body RJC pullies, RJC A/C bracket,GTK-850, ATR headers,Deeds electronic boost controller, Cotton’s 4 inch down pipe w/ Turbonetics RG 45 gate, XFI, Cotton’s front mount, Level 10 built 400 trans w/brake, Converter? ,33 spline Moser axles, Spool, HR bar. New best 9.44 @ 143!
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#6
03-22-2009, 03:51 AM
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Mike, don't forget that a larger diameter tire will increase ''roll-out'', enabling you to cut better lights than smaller diameter ones as it take them more time to leave the staging beam...Does that make sense too? That was an popular trick back my NHRA Super Stock years...
 Claude.
__________________
1987 Buick Grand National 9.70 e.t. @ 139.35 mph 1971 Chevelle SS 2008 Ford F-350 Crew Cab Dually 2012 Lincoln MKX
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