| Author | Message | ||
| Steve Magnusson (91tr)
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Tim D. -- I've not heard of any source for 16" sunburst wheels. I was just expressing my opinion that IF they were available I think that they'd look great on an early 308GT4. You may be "stuck" with going to the 16" pentastar wheels for your upgrade (but that's not really a problem is it?). | ||
| Timothy J. Dressel (Tjd)
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Steve M, I've kinda' warmed up to the sunburst style on the gt4, but some day I'll need larger wheels for good tire selection. Are you saying that there's a 16' sunburst that fits a gt4? Is it stock or very close to stock? --tim d | ||
| Steve Magnusson (91tr)
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Tim D. -- thanks for the pic. I thought silver/grey was the more "normal" color -- the ones in the Showroom seems to be finished in a tacky (IMHO) gold. I still think that sunburst style in 16" and silver/grey would look A-OK on an early GT4 (and great on a 246). | ||
| Timothy J. Dressel (Tjd)
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Steve M, Sorry for the late response; I had to get my hands on a digital camera. This wheel is from my '75 gt4.  | ||
| Steven J. Solomon (Solly)
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Thanks for all the help guys. I'm going to stay with the Cromodoras, but must find 16" wheels. I checked out Superformance, but they are selling a 14" model. I've seen FAZA ads for Cromodoras and Campys in Hemmings. I'll let you know how I make out. | ||
| Bill Sebestyen (Bill308)
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Superformance shows, what appear to be, used sunburst wheels for sale on their website: http://www.superformance.co.uk/news/index.html Bill | ||
| Steve Magnusson (91tr)
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Tim D. -- Post a pic of your GT4 so we can contrast/compare. There's only one GT4 sunburst example in the Showroom (that I could find easily) but the wheel finish looks a bit odd... I too think the Pentastar wheels look great on GT4s -- I've yet to see anything aftermarket that I like as well or better. And sure, I'd take 16" Pentastars over 14" sunburst in a heartbeat on a GT4, but I still have that quirk for an early Dino looking like an early Dino so IF 16" sunburst could be had... | ||
| '75 308 GT4 (Peter)
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These were optional on the GT4, 7½ X 14" at that time. Mine must have had other wheels on in the beginning, because the casting dates on the inside of these Pentastars are 1976 (and my car is a '75). For the GT4, 16"ers were avaliable at the corresponding time as offered on the GTB/S. My spare wheel by the way, is a 6½ X 14" Campagnolo Pentastar. Since nobody even looks at their spares, let alone replace it when choosing different wheels, I imagine my car must have had these when it rolled out of the factory. | ||
| Timothy J. Dressel (Tjd)
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Peter, I�ve seen your pics of your �75, and the Pentastas look great on it. I�ve been meaning to ask, are they original for this model/year? If so, what size are they? My �75 has the sunburst style wheels. --tim d | ||
| '75 308 GT4 (Peter)
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Steve M., I've heard those wheels called "sunburst" before. I think that is the official english term for that style. There are only two GT4's here in B.C., mine and the one for sale at the dealer. The dealer car has those sunburst mags and mine has the Pentastars. With the Pentastars, at least the GT4 "looks" like a Ferrari, the sunburst.... ? But when it comes to the Dino 206/246, hands down the sunburst is the best looking mags for it. | ||
| Paul Sloan (Sloan83qv)
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Here's a great link for everything about wheel fit and tech info. http://www.tirerack.com/wheels/tech/wheeltech.htm | ||
| Steve Magnusson (91tr)
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Solly -- Thanks for the reminder about the "Showroom" -- good luck with the search, but seems like a tough one. If I had an early 308GT4 that came with the same (sunburst? -- anybody know what to call these?) style and could get these in 16", I'd prefer that to even the 16" 5-pointed star style (which I wouldn't put on a 246). If you are limited width-wise you might want to go only 16" (not 17") to keep the diameter/width ratio down -- I noticed a BMW (or some other smallish sports sedan) in the parking lot the other day with 18" wheels, but the width was rather narrow -- looked a little out of proportion to me -- JMHO. | ||
| '75 308 GT4 (Peter)
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I know of no "vintage look" Campagnolo or Cromodora wheels bigger than 16". I don't know if he's still in business, but Al Cosentino of FAZA in Thousand Oaks, CA used to sell tons of Campy wheels (normally for Fiats and Abarths, but had selections for other marques, including Ferrari). I've seen his very small print ads in a few issues of Forza awhile back. | ||
| Steven J. Solomon (Solly)
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Steve, I posted a picture of the 246 under the Showroom area of Ferrarichat, under title "Future Ferraristi Part 2". Bottom picture shows the 14" Cromodoras that came with the car. Stock width is 6 1/2", and I believe you are correct that max width will be 7 1/2". | ||
| Steve Magnusson (91tr)
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Solly -- (Can't help with your wheel search, but I am curious about a couple things --) Do you mean a particular 246 wheel style by "Cromodoras" (sunburst?). I'm not familiar enough with 246s to know what this means -- can you post a jpeg of an example? Also, if your 246 is without flares, isn't the wheel width limited to 7" or maybe 7.5"? | ||
| Steven J. Solomon (Solly)
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Thank you both-big help. Now if I can only find some 16-17" original Cromodoras | ||
| Steve Magnusson (91tr)
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Solly -- brainfade on my part. I should have said: wheel offset = (A-B)/2 | ||
| Steve Magnusson (91tr)
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Guys -- I think Solly has a 246 (although it's probably the same as 308s). Solly -- Measure the center-to-center distance between any two non-adjacent holes in the bolt pattern. If the distance is about 102.7 mm then the bolt circle is 108 mm (If it's not 102.7 mm, let me know and we can math it out). For offset, measure from the tire inner sidewall plane to the wheel mounting flange plane (call this "A") and from the tire outer sidewall plane to the wheel mounting flange plane (call this "B") -- wheel offset = A - B (it's probably best to take a wheel/tire off the car to do this -- that way you can put the tire sidewalls against the ground and just make vertical measurements with a ruler to the wheel mounting surface in each case) | ||
| Paul Sloan (Sloan83qv)
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offset is 11.5 mm (308) and Bill is correct 5 X 108mm or 5 X 4.25" | ||
| Bill Sebestyen (Bill308)
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Solly, I believe the bolt pattern for a 308 is 5 x 108 mm. Bill | ||
| Steven J. Solomon (Solly)
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Thanks Eric and Steve. How do I find offset and bolt pattern measurements, they are not in manual? | ||
| Steve Magnusson (91tr)
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Solly -- try this: http://toy4two.home.mindspring.com/tire.html | ||
| Erik Lombard (Elombard)
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To convert whel sizes rooughly you can do the following: 14" rim w 70 series tire = 15" rim w/ 60 series tire = 16" rim w/ 50 series tire = 17" rim w/ 40 series tire etc. to do it exactly you can do the following rolling circumfrence = 2 X pie X Radius Radius for a tire size = width X aspect ratio + 0.5 X Rim Diameter For a 205/70/14 = (20.5 cm X 0.70)([covert to inches] div. 2.54cm/in) + (14" X 0.5) 5.64" + 7" = radius of 12.65" so 2 X 3.14 X 12.65 = rolling dia of 79.442" A popular wheel/tire upgrade for 308s is the 16" quattro valve wheels. Lets compare the rolling diameter for this setup. Lets use a 225/50/16 tire for example [(22.5cm X .5) div. 2.54cm/in.] + (16" X 0.5) = 12.43" so 2 X 3.14 X 12.43 = 78.06 The rolling radius is slightly smaller which will give a slightly better gear ratio but your speedo will be off by a little. A worth while tradeoff in my opinion, we are talking about an error of less than 2% or about 1 mph at 55 mph. I doubt the Italians speedos are that accurate anyway. I looked into some 17" wheels for a 308 and the best seal I came up with was some Revolution brand wheels. They are a light weight high quality wheel for a reasonable price. They can get the correct offset and they custom drill the bolt pattern for an exact fit. | ||
| Steven J. Solomon (Solly)
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Anyone know a formula to convert 14" wheels with 205/70/14 tires to 16 or 17" wheels with ??? size tires, in order to maintain same original total diameter? Anyone know if Campagnolos or Cromodora wheels are available in 16 or 17"? |