348 348/355/360 wheel offset

That can happen with stock wheels and ride height as well. Example - when entering/exiting a steep driveway at full steering lock a front suspension corner can get very compressed. My previous 348 had a similar "snag" but less so (not noticeable unless looking from below).

 

Not sure the offset did not do front math yet but the tire looks right probably 225. I like the 215 front and 295 rear both are .1 larger than oem so zero changes to suspension.

You will want to avoid this with machining. Search for a thread called 360 wheels on a 348 I think it was. Read it closely.

https://www.ferrarichat.com/forum/index.php?threads/331477/
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My 348 front did that but I had 11mm spacers I was going to take off 2mm assuming it was that...

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I have a set of 18" Fikse FM5 wheels, 9.5 in the front and 11.5 out back (total width). Tires are 245/40 - 18 and 295/35 - 18. Still in project mode...

https://www.ferrarichat.com/forum/posts/145280510/


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These wheels were originally custom-ordered for and used on a 348 Challenge car during the 90s.

I'm interested in the offset as well (out to do more measurements...).

 

For the 18" 360 Challenge wheels, 7mm was shaved from rear wheels.

https://www.ferrarichat.com/forum/threads/360-challenge-wheels-on-348-what-i-did.517087/


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What width are the rims? 10.5" and 8.5"? How is it with all the rubber? I figured one would notice the unsprung weight compared to the svelt 348 setup.
Because I REALLY like the 550 wheels on the 348, is why I ask, they too have wide azz rubber.

 

Yes, 8.5 and 10.5.

Using this calculator, the rear offset is 51 mm.

https://tiresize.com/wheel-offset-calculator/


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Interestingly, they have the same offset as the Mondial t rear wheels.


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Put in 10.5 for the wheel width, its the rim width as the top dimension not overall. ET is the distance from center of the rim to the back plate flange face.

The 550 wheels actually need 21mm removed making ET 53 to be the same as the 355. I have seen 550 wheels on a 348 and the track was similar to yours I bet it was about 55-60 ET, taking off 21mm from 550 wheels is a tall order but 10-15mm sure. Your stance is a bit wider still from the pics, hard to tell but it appears so, I bet your closer to high 50's.

 

Interesting. I thought for sure this guy said "total width".

 

But yeah, Tire Rack says...

"The offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel."

https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=101

So, 64 mm

 

Ok that makes more sense given other 10.5's I have seen. Keen wheels Wade I bet they are light and rigid!

You need to overall width to measure suspension coil clearance against tires etc but that that's not wheel ET which is German for insert depth or something akin to that.

 

I love the 360 starfish wheels on my 348. The lugnuts are a different length than the ones for the original factory wheels. I have no spacers on with the 360 wheels
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360 and 430 FRONT wheels will have 6.5mm wider stance than 348/355 front rims with 11mm spacers installed. So they will fill the fronts better and I think look better. Given that stock wheels can eat the fenders I bet this does no favors. My stock 348 with 11mm spacers catches the inner fender sheet metal and you can't really roll them the liner sits right there. I mean you can but you have to force it. I would machine off 7 mm from the fronts.

At that point it makes more sens to just but wheels from bcforged in the correct offset in whatever concave and color you wish like these HRE P47 variants.
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19" HRE P47's in 18's and silver poweder coat they would be perfect I'll wager.
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Here is how my rear sits, took a picture this AM as I was on my way to work.
This is a 95' Spider. Tires on rear are 275/35. Absolutely love the way it sits flush.
Have ordered 225/40s for the fronts.

Will be lowering it in a few weeks time when I have a free weekend.

Click thumbnail for full size image:

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Lools good. Some love that look no doubt. Some don't. It's all personal preference and that's that.

But if someone wants 360 wheels to sit like 355''s (like I do) macine info ranges are at top of post.

Post side view ! You changing ride height all around basically resetting suspension? Your rear tire will be smaller than your front with 275 and 225s as I'm sure you figured out.

I wish I could lower but I scrape all over the damn place in NJ. I miss Arizona roads can slam a car there. Not here, oohhh noooo.


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Those BC Forged might be a really good solution. 430 style but 18". I like.

360 CS wheels look very good as well.

 

That's right but 18" and better looking than 430 IMHO. The double spoke deal looks good with the cheese graters perhaps better than the 360 startfish. A 295/35 x 19 tire is like an inch taller. Better not turn the front wheels while compressing suspension or corner real hard it will eat the fenders. Looks good but practicality not so sure then you have the whole resetting spring heights chasis setup and alignments.

 

I based my wheel spec off this post when I ordered my wheels. The single best post regarding 360 wheels on the arguably one of the nicest set-up 348s out there.
https://www.ferrarichat.com/forum/posts/139189146/

 

I like how the one guy at the end says with the 19's he's a little taller than stock. His rear tire is over 2" taller, one would need to lower the car 1" then reset suspension. He is right about the 360 tire size selection imho.

That post has some good info for sure but it is not 20mm milled off although one could. Picking our the correct bits takes effort as there is conflicting statements.

For the most part the post says they fit no issues and also you need to machine them. Thing is some people like the wheel offset sticking out of the fenders look and if so, bolt on up no doubt you'll get what you like. Some don't even realize it I'm sure. The trick is understanding what does "fit" mean. Doesn't rub therefore it fits! I don't think fit and what one likes are the same thing... Its actual math if your using oem 348 or 355 as the measure. 15-17mm off rears. Beyond that it's what you prefer and thats all well and good but there is a distinction is all I am saying.

Go for the look you want there is preference to consider here but go in armed with correct information, this topic in general forum wide is riddled with inaccuracies that causes confusion, same with 430 wheels. Spun me out for months too.



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This is all really good information to have. I'm sure I'll drive myself crazy with measurement when I do take the plunge. Most 360 wheels I've seen need to be machined. At least the look to my eye. Wheels are primarily a cosmetic thing, imo. I'm not trying to extract tenths out of this car. Lightweight wheels enhance the driving experience, to be sure, but I'm mostly after a look. Luckily, I can take my time. Every time I start thinking about mods, the more I think this car looks damn good the way PF penned it. So I'm happy stock for now, but I'll change a few things eventually. I'm sure I had a point to all of this, but I've lost it by rambling. Carry on

 

I think the looked better all silver

 

Those look amazing wow!

 

I concur, front also needs caution.
With OEM 360 rubber, 215/45R18, these definitely rub. (Michelin Pilot Sport)
With 225/40R18 they rub less, but they still rub. This is with Pilot Super Spor, front tread width 7.7"
Falken RT660, ToyoR888R, Hankook RS4 are 8.2" to 8.3" tread and would rub more.

I haven't damaged my fenders yet, but I can hear/feel the rub under specific circumstances.
In particular, bump at turn-in of #5 at our racetrack, if I have a passenger.
Also, a faint trace of red paint on my tires.

360 fronts have an offset of 31.5mm
348 fronts have an offset of 49mm
The difference is the equivalent of adding a 17.5mm spacer.

I'm thinking I need to machine minimum 5mm - this would be the equivalent of OEM + 12.5mm spacer.
Or more if I want to choose a tire with more tread width.

Does anyone know how much can be machined off 360 rims before shorter bolts are required?