355 Current market pricing for 355 challenge speedline wheels

Oops, what am I missing? Where are these at?

 

https://www.ferrarichat.com/forum/threads/348-f355-challenge-original-speedline-sl886-magnesium-wheels.706410/

 

Manufactured date: 1996. Pretty early or period.

 

Already have these, was looking for the O.Z. Set up

 

My point was there is a possibility a +77.9mm rear does exist and the fact these have an early manufacturing date, which is rare to come across… adds to the discussion. If these sizes exist, it is more likely to be from an early iteration.

 

Ohh I got ya!
Those weird offsets don’t seem very practical for 348/355. The rears I have are the normal @68mm , my fronts seemed off by 4mm (65) but maybe that was a mistake I made in my measurements or calculations?
I’ve only seen that 77mm rear offset posted one time in a pretty old post. +77 would be so inboard it would look fairly ridiculous on a 348/355

 

Anyone know if it’s possible to put the 355 challenge wheel studs and nuts directly onto a street car with the challenge wheels? Essentially, replacing the standard wheel bolts for the stud and nut

 

Any m14x1.5 stud should work for this purpose.

https://otisincla.com/product/otis-inc-la-m14x1-5-screw-in-hub-stud-w-inner-hex-62mm-shank-73mm-tl-black-zinc-copy/

 

Yes, there are many options in both steel and titanium for stud conversions. You just need to properly measure the length you want (with a stud conversion extra length is not an issue except for cosmetics) and make sure you get the correct type of lug nut (these cars use cone not ball seats).

 

You only need to worry about length if you want to use close ended nuts. Otherwise let your freak flag fly.

 

OK so please bear with me as I’m not the most mechanically knowledgeable. If I purchase the OEM challenge wheel studs (part number 163299) and the OEM challenge close-ended wheel nuts (part number 163370) I can just bolt them right in to my street F355 GTS with the Speedline challenge wheels and fitment, clearance, etc. will be perfect?

 

Yes. But theres no reason to pay the Ferrari tax for a widely available thing. Just buy generic. But yes.

 

Got it. And thanks for the info. Generally I like keeping things as OEM as I can, even if it means paying the Ferrari tax. But I take your point. Cheers

 

Wheels just got back from painters. Looking good. Just waiting on the delivery of the studs and nuts to mount them on the car
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I have a set of OEM ones that need refinishing that I'd probably part with if anyones looking.

 

Lol @ these “remakes”

https://www.ferrarichat.com/forum/threads/ferrari-355-348-challenge-wheels.708310/

 

I have 3D scanned and made CAD drawings of the original speedlines and can make them nearly identical to original spec in forged magnesium making them even lighter than the originals, in any size or offset.

Problem I'm having is, the original ones are cast...and the front wheel spokes protrude past the lip ever so slightly. We aren't able to do that with a piece of billet.

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I could "flatten" the face of the front wheels and compensate with offsets, but it won't be 1:1 identical.

 

I suspect you could if you built them as a 2pc (with hidden hardware), no?

 

Yes but then they'd be heavier. Goal is to recreate the original size and offset with modern materials.

 

Folks unwilling or unable to buying real SL886s are going to need to compromise on authenticity or weight. There’s no way around that.

 

You're not able to make the spokes the edge of the billet piece instead of the barrel? It would seem as long as the total wheel fits within the billet piece it should be able to be machined out of it, or is the billet piece just not large enough?

 

My understanding is in theory, yes, but practically, no; not with the blanks most folks seem to use.

 

It would seem that if you have blanks large enough for the rears, the fronts will also be possible (as the entirety of the front will fit inside the rear).

 

They’re not solid tho.