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tire size. |
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dragrambler 
AMC Addicted 
Joined: Dec/21/2008 Location: athens ga. Status: Offline Points: 665 |
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 Topic: tire size.Posted: Mar/15/2010 at 5:54pm |
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i guess this is the right place for this question. some of you know of my 68 american. but for those that dont i will recap. its got a 199 i6 with b/w standard tranny. 3.40 rear gears. the rear rims are 15x8 and the rear tires are 28" dia. i feel this is way to tall of a tire for this engine off the line and would like some opinions on what diameter tire might be best. last dyno run showed 132 rwhp and 186 torque. i will be puting a holley 390 on it soon and a wide band a/f meter. and later an intercooler.thanks for any input.
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68 american turbo I6
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65Classic
AMC Apprentice 
Joined: Jan/22/2010 Location: Joliet, IL Status: Offline Points: 55 |
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Posted: Mar/15/2010 at 9:18pm |
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A P265/50/15 is a good short tire for a 15x8 rim if your looking for regular p-metric street tires. |
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dragrambler
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Joined: Dec/21/2008 Location: athens ga. Status: Offline Points: 665 |
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Posted: Mar/16/2010 at 4:06am |
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ok i will check those out. the size on there now are 275/60 r 15.
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68 american turbo I6
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PHAT69AMX
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Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5926 |
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Posted: Mar/16/2010 at 9:59am |
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This may help, self made 15" tire size chart using an Excel Spread sheet.
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HURSTSSAMX69
AMC Nut
Joined: Jan/18/2010 Location: Sauk/Prairie,WI Status: Offline Points: 437 |
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Posted: Mar/16/2010 at 10:02am |
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295/50R15 or 245/60R15 both would give you better 0-75 yet run 75mph with out over reving your engine . . .
Use a gear calculator and at the highest speed you'll drive it for any distance should be between 2,800-3,200rpm rpm is what i was told with these older engines . . . Mike |
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1953 REO M48 w/w.
1962 GMC C3000. 1966 Rambler Classic. 1969 AMC AMX-390. 1982 Chevy C30 diesel. |
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dragrambler
AMC Addicted
Joined: Dec/21/2008 Location: athens ga. Status: Offline Points: 665 |
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Posted: Mar/16/2010 at 6:21pm |
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well i called the tire store today and they suggested either a 235/60r15 or a 245/60r15 . both are as close to the original dia.right now with the 275/60r15 at about 60 mph and i am guessing at the mph because of the huge tires the rpm is about 2200.thanks for all the help . the best i can tell the original tire dia. would have been about 26". once i get the car back on the road in a couple of weeks i will do a video for you guys of it driving.
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68 american turbo I6
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amx39068
Supporter of TheAMCForum 
Joined: Feb/21/2008 Location: Arizona Status: Offline Points: 11576 |
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Posted: Mar/21/2010 at 10:50pm |
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Use this site. It let's you see the difference and it tells you how much your speedo will be off.
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Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
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