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Old 10-04-2012
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Willy Willy is offline
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Join Date: Jun 2007
Location: Chicago U.S.A.
Posts: 11,735
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TF & FC are required to run SFI Spec 15.4 wheels Jan 1 of this year.

SECTION 18: TOP FUEL DRAGSTER, TIRES & WHEELS: 5, WHEELS (Page 7)
Front wheels meeting SFI Spec 15.2 mandatory. Beadlock 16-inch rear wheels mandatory, beginning Jan. 1, 2012, rear wheels meeting SFI Spec 15.4 mandatory; inner bead minimum 14 3/4 inches (+/- 1/8-inch). Beginning Jan. 1, 2012, a) All wheels must be drive hub type and must mate with required drive type hub.

Here is a pretty good explanation of the difference between 15.3 & 15.4 wheels.

http://bangshift.com/blog/wheel-tech...ld-racing.html

and.......

http://www.sfifoundation.com/Spec_15.3_072010.pdf

http://www.sfifoundation.com/Spec_15.4_072010.pdf

And the latest & greatest design to date.....

http://www.competitionplus.com/drag-...-welds-delta-1
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