355 Current market pricing for 355 challenge speedline wheels

Here’s my opinion from looking at period challenge photos.

348 Challenge did not have Speedline Challenge wheels until later in the series. Perhaps 1995 when one was developed for the 355. Hence, you still see 348 challenge cars with saw blades as not every 348 made the change.


However, 348 GT Competizione cars built by Michelotto for a different series (GT Championship) had the first iteration of Speedline wheels. You also see OZ wheels on some of these samples. There’s only 11 of them in the world. Some have centerlocks, some don’t. Either 5 lug or centerlock Speedlines or 5 lug or centerlock OZ’s. OZ and Speedline were the main suppliers of real racing wheels in period.

My hunch is Michelotto worked with OZ, then later Speedline to create a 348 fitting mag wheel for their race builds. I would say Michelotto worked with Speedline to develop a mag wheel for the 348 GT and Ferrari used those wheels to develop a 355 Challenge concept. Hence you see the first iteration of “challenge” wheels only in press release 355 challenge cars. I’ve never actually seen them on any 348/355 challenge cars in practice. The only car I’ve seen with them is the Mandarina Duck F355, which is just a very early Berlinetta, not a challenge car.


After using the Speedline wheel Michelotto/Speedline already developed for the 348 as a concept, at some point Ferrari worked with Speedline to develop/design one for the 348/355 Challenge with Ferrari part #’s. Sizes and faces altered to what you see today.

 

They, and others, look good actually. Do you have any pics of bad powder on an SL886? Otherwise I think I’ll need to mix that section.

 

These look bad to my eyes. To each their own .

*Fchat uploads in lower resolution, so perhaps flaws I see aren’t as clear here.

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Here’s good.


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The good are clearly good. The bad it’s hard to tell if it’s digital compression or orange peel.

 

Orange peel 100%.

 

Many updates just published. Comments welcome. https://348s.forsale/2025/06/04/speedline-challenge-wheels-buyers-guide-sl886

 

As this thread has included a discussion of spacers, I'd like to attach this Racing Setup guide which includes the effect of front and rear wheel track on understeer/oversteer...

 

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Apparently, blue Speedlines were popular among a few in 95.





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Blue wheels on a race car look good!

 

Painter’s tape blue?

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They changed the rear suspension geometry at some point and increased the rear track. I think it was when they went from the ts and tb to the gts and gtb (1993).

 

Right, but that later geometry is the same as the 355 so why does the 355 have a significantly different track?

 

They only changed the rear wheel offset, no other changes to the width. As far as I’ve seen in my year or two of reading about these funky Italian cars

 

The 348 had 9s on 255s in the rear. The 355 had 10s on 265s.

 

I think they also made geometry changes. What exactly they changed I'm not sure. I don't think it was only the wheels. Roll center/camber gain adjustments maybe?

I wonder if the other rims are to change handling balance per Barry's post. Let's give ShineKen a few days and he'll probably unearth it

 

They changed the suspension geometry earlier, for example, my May 1992 production euro 348ts has the updated geometry.

 

they only changed the upper rear control arm mount location slightly. No changes to track width.

 

They did. In the form of lower offset rear wheels. They went from 9” et 68 to et 43.

 

HOLD ON!

Ferrari part #’s for 348 and 355 wheels are different for whatever reason.

@Ob917

You might actually have different front than normal. +43.65 to be exact.

https://www.ferrarichat.com/forum/threads/348-355-speedline-wheels-differences.519412/



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Records show F355 Speedline Challenge wheel part #’s


Front - 163362 … superseded by 163363

Rear - 163365


It’s possible 163362 is an 18 x 8.5 +43.65 (and OB917 mistakenly measured at +45).

 

haha the mystery deepens!

 

Wait… hold on…


Fronts are supposed to be 18 x 8 , not 8.5…. So that wheel is really off.


Did @tres55 ever confirm that wheel is actually a 5 x 108 ?


Speedline made SL886’s in several bolt patterns.

 

You need to triple check if your wheel is an 18 x 8 or 18 x 8.5.