Racing Slicks

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   I'm looking to see what size racing slick and rim (with back spacing) are being run on the 1969 AMX at the drag track???  Can someone help me?  Thanks 

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Lisa69AMX Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Fan Joined: Mar/10/2020 Location: New Jersey Status: Offline Points: 3	Post Options Post Reply Quote Lisa69AMX Report Post Thanks(0) Quote Reply Topic: Racing Slicks Posted: Mar/10/2020 at 10:46am
	I'm looking to see what size racing slick and rim (with back spacing) are being run on the 1969 AMX at the drag track??? Can someone help me? Thanks

ScreamerX Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Apprentice Joined: Apr/30/2013 Location: Chicago IL Status: Offline Points: 125	Post Options Post Reply Quote ScreamerX Report Post Thanks(1) Quote Reply Posted: Mar/10/2020 at 11:31am
	Hope are some measurements from the rear of a 70 AMX. A 17x9.5 AR Torq Thrust VN215 wheel with 5.56" backspace works. Need a 1/4" spacer to center the wheel in the wheelhouse. A 275/40/17 tire (Toyo R888R) leaves 1/2" between tire and leaf spring, and 1/2" gap between tire and fender lip (mine are not rolled). The wheels are advertised as 9.5" wide. That's the bead width. The physical width is 10.5" wide. The R888R has a 9.8" tread width; 10.9" section width; and is 25.7" tall. It fills up the wheelwell. It's sticky, but not a drag slick. Using it for autocross. Hope this info is helpful regarding sizing and what fits in an unmodified rear wheelwell without jacking the car up.

PHAT69AMX Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919	Post Options Post Reply Quote PHAT69AMX Report Post Thanks(1) Quote Reply Posted: Mar/11/2020 at 3:29pm
	My motor made MAYBE 400 hp at the flexplate and I ran Mickey Thompson 26 x 8.5 ET Drag Slicks with tubes on 15 x 8 with 4-1/2" Backspace / 0" Offset with no problems at all on a '69 AMX with the stock rear end. imho they were wide enough for the power being made, the smaller diameter helped with the somewhat 'street friendly' 3.73 rear gears, they fit inside the car behinds the seats for the drive to the track, the smaller radius from axle center to the ground transferred more torque to the ground pretty sure... Slicks are are Bias Ply tires, I used regular inner tubes from K-Mart back then, and for Bias Ply front tires I ran 6.00 x 15 4-ply Volkswagen tires 26" OD x ~4" tread first on 15 x 4 steel doughnut spare tire rims, then later on 15 x 4 Weld Racing Drag Lite rims. Really like the look of square shouldered tread profiled bias ply tires for that late 60's period look. Seems almost all modern high dollar 'front runner' tires are round shouldered even though they're bias ply. Sorry to those who may be tired of seeing the same old pictures... Weld Racing Drag Lite rims, and others, are common to find used for a good bargain, a lighter than ANYTHING else imho, have both bolt patterns, and easy to clean, polish up really nice and pretty easily, but sadly very often with 5-1/2" backspace since that is what fits on many Fox Body Mustangs... Up to you, but they will work with a ~1/4" or 5/16" rear wheel spacers... I found only ~1/8" sidewall to leafspring clearance when trial fitting 15 x 8 w/ 5.5" backspace and 255-60-15 tires on my '69 AMX, 255-60-15 is basically same width as the slicks, but 1" taller at 27" OD nominal. Other than slicks, the smallest Mickey Thompson Sportsman PRO available, ( size is only offered in the 'PRO' version, which is sticky compound ) is also a really nice size rear tire for an AMX - 26 x 10.5 x 15 and is also a bias ply tire and also requires use of inner tubes. 'Ideally' for the 'best' contact patch the rim width should match the tread width and both the 26 x 8.5 MT ET Slicks and the MT Sportsman Pro 26 x 10.5 x 15 are ~8" tread width. Edited by PHAT69AMX - Mar/12/2020 at 12:31pm
	Link to a Short YouTube Burnout Video

Lisa69AMX Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Fan Joined: Mar/10/2020 Location: New Jersey Status: Offline Points: 3	Post Options Post Reply Quote Lisa69AMX Report Post Thanks(0) Quote Reply Posted: Mar/12/2020 at 7:48am
	We are ordering tires and rims for the track and this is the info we needed. Thank you

amxron Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Nut Joined: Nov/18/2011 Status: Offline Points: 295	Post Options Post Reply Quote amxron Report Post Thanks(1) Quote Reply Posted: Apr/12/2020 at 12:14am
	Centerline Autodrag 15X8.5 put the tire right on center. 28X9X15 Slicks fit if you fold under the front lip. Ron.
	AMXron Fleet/Jeep Mgr. Orbit AMC/Jeep 50-1787

Rebel Machine Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5122	Post Options Post Reply Quote Rebel Machine Report Post Thanks(1) Quote Reply Posted: Apr/12/2020 at 7:19am
	In the past I was running a 26" x 8.5" M/T slick on a 15" x 7" wheel (3 3/4" backspacing) when my 69 AMX was making 450 HP and had no traction problems on a prepped surface. It located nicely in the wheel well. Now I'm around 580 HP and just got a set 26" x 10" Hoosier slicks on 15" x 10" wheels (5 1/2" backspacing). I have a 9" rear axle that is slightly narrower than the stock AMC20 axle. My axle needs a 1/8" spacer to keep the tire from rubbing against the leaf spring and has plenty of fender clearance. I think this combination would fit the stock '69 AMC20 width nicely. Anything taller than 27" will rub the wheel lip. -Steve-