Porsche 914- GT Wheel and Tire Specs, Wheel and Tire Specs |
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Porsche 914- GT Wheel and Tire Specs, Wheel and Tire Specs |
Arnage |
Aug 12 2017, 08:32 AM
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#1
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Newbie Group: Members Posts: 3 Joined: 12-August 17 From: Dade City, Florida USA Member No.: 21,339 Region Association: South East States |
Hello. I am new to this group. I am looking for the original wheel and tire specs for factory 1970-72 914-6 GT's.
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larryM |
Aug 20 2017, 09:55 PM
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#2
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emoze Group: Members Posts: 891 Joined: 1-January 03 From: mid- California Member No.: 65 Region Association: Northern California |
everything above is about right - it depended almost entirely on what racing/rallye venue's rules were to be followed - and in what year
The Info for Sports Purposes document 4890.20-200-03-72 (see page 33-35) shows the 914/6 (on all 4, not staggered) 6"x15 for rallye, with tires spec 185/70-15; and 7"x15 wheels for racing with racing tires spec 4.75/10.00-15 (same as on 917 www.flickr.com/photos/wbaiv/6252749070) - the 914/6 was spec'd for 21mm spacers with the 6's, and 27/35mm for the 7's (also spec'd long studs & steel lugnuts for racing) as a general rule - 7x15's were the FIA homologation spec as seen in the "factory docs"; fwiw - even tho we love 'em for a 914-6 - the 8x15 Fuchs did not show up until the 1984 Carrera as an option (7x15 frt, 8x15 rear) according to a July 1985 Panorama story - page 45 let's also remember that the "porsche spec performance tire" of 1970 was a 185/70xVR15 for both the 911 & 914/6 my TUV K'brief shows my car was fitted & approved for 4 "7x15 alu" wheels for German road use - (i.e. Fuchs) - sometime later my car was fitted in Germany with 4 custom lite-weight 7.5" steelies which can be seen in my old photos on Pbase - they only weighed about the same as alloys - unfortunately i was unaware of their rarity & let 'em "get lost" long ago SCCA GCR up to 1972 generally allowed 1" wider than FIA spec; in the 1972 GCR they went up to 1.5" wider, but limited overall track width in both cases - so that's why most serious vintage groups & PCA allow 8x15's - but no x16's for the street - 15's are hard to fit with good all-around-use tires - so i run 4-7x16 Fuchs with AS3's so that i can freely rotate them to get better wear/life and use year-'round if you plan to race it - read the rulebook for that venue - or be prepared to own several sets of wheels & tires (i have 3 different sets-of-4 for my GT plus a pair of 8x16, and 3 sets for my MGB) for scca & vara i ran 7&8x16 BBS; for HMSA & PCA i could only run x15 Fuchs - we are talking directional tires here - usually DOT-legal racing tires, .... HMSA would allow pure slicks (see Jon Wactor 9140430375 and Eddie Arrowsmith running goodyear cantilevers) because the 4.75/10's were allowed per factory spec - the story is that Arrowsmith successfully petitioned HMSA for that - IIRC the Sunoco GT used non-Fuchs (minilite?) rear wheels 'cuz ther was no 8" Fuchs then (or maybe it was the French car Ranson Webster now owns & races 9140430457 - or both) - pay-to-play . |
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