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In the process of working out my 16x8 +25 fitment now with an installer. After consultation, to fit the wheels without poke I have purchased front and rear camber arms (both upper), may potentially have to reduce caster on the front and "shave" the inner guard lip (as opposed to roll and deform the guard/bumper junction).

The front guard is the most challenging due to how the inner is connected to the lip. The installer has recommended more camber as opposed to shaving if I want to maintain the guard inner.

A 17x9 +20 would require a decent amount of work to fit for sure.
 

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I have rubbing on 225/45R17 tires and 1.3" drop. The rub is all vertical, meaning tires are too tall rather than too wide. Outside diameter of 225/45R17 is 25", last safe size I had was 215/45R17 (24.6" diameter), never exceed this if you're lowered by 1.3". I found out the hard way that new fender liners on our cars are SUPER DUPER EXPENSIVE!!!
 

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Discussion Starter · #46 ·
Custom 17x10’s or a 5-lug hub swap/adaptor?
Indeed we might do that just to perfect the fitment. Got an odd set of 52mm 17x10 6UL wheels here that we used on NC with spacers to figure up our new NC 17x10 shown below (final offset 17x10 production Hypergram below is 43mm). We could use 4x100 to 5x114 converter from Blox or similar and end up around the offset I think we will need to make 17x10 work on the Fiata/ND chassis. At last BMW Club Autocross we ran the Fiat 124 against this NC. The Fiat makes more power, but the mechanical grip advantage of this 17x10 setup was faster in every turn and the Fiat ended up about 2 seconds behind. The results of jumping seats between these cars was clear: the Fiat needs wider than 17x9 for this game of grip! Notice the NC Budget Racer below also has the Lexan rear spoiler, that has proven good for about half a second advantage at autocross, working on same for the Fiat 124.

 

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I have rubbing on 225/45R17 tires and 1.3" drop. The rub is all vertical, meaning tires are too tall rather than too wide. Outside diameter of 225/45R17 is 25", last safe size I had was 215/45R17 (24.6" diameter), never exceed this if you're lowered by 1.3". I found out the hard way that new fender liners on our cars are SUPER DUPER EXPENSIVE!!!
will you try 40 tires?
 

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will you try 40 tires?
225/40R17 has smaller diameter than 215/45R17 so it will not rub. Use this to calculate diameter


Just don't exceed 24.6" if you're lowered by 1.3".
 

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I feel like I cheated by running a 225/45r16 on 16x8 with a 23.9” diameter. No rubbing lowered 1.3” and still get a tall tire for the street. It even lowered the car slightly more.
 

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Indeed we might do that just to perfect the fitment. Got an odd set of 52mm 17x10 6UL wheels here that we used on NC with spacers to figure up our new NC 17x10 shown below (final offset 17x10 production Hypergram below is 43mm). We could use 4x100 to 5x114 converter from Blox or similar and end up around the offset I think we will need to make 17x10 work on the Fiata/ND chassis. At last BMW Club Autocross we ran the Fiat 124 against this NC. The Fiat makes more power, but the mechanical grip advantage of this 17x10 setup was faster in every turn and the Fiat ended up about 2 seconds behind. The results of jumping seats between these cars was clear: the Fiat needs wider than 17x9 for this game of grip! Notice the NC Budget Racer below also has the Lexan rear spoiler, that has proven good for about half a second advantage at autocross, working on same for the Fiat 124.
You think you can make a 17x10 fit with the stock fenders?

I am dumping my 124 in favor of buying a cheap NC to track, but it will still be really cool to see an ND chassis on 17x10's!
 

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Discussion Starter · #52 ·
No 17x10 in stock Fiat 124 fenders, massive roll/pull at the very least, will see....and likely just have to cut and add flares.

In contrast, that NC is pretty easy fitment of 17x10, good lip roll still needed but no flares for our new 17x10.
 

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Discussion Starter · #54 ·
This past weekend, our Fiat 124 at Kickoff Autocross Event for 2020...and winning as fastest thing with doors!

That's 17x9 with 245/40 Rivals. Working on 17x10 fitment for same 245/40 size tire. Some folks ask me "Why 17x10 for same 245 if you can stuff that on 17x9?" The reason is that spreading that same tire on 17x10 will be faster, because the extra inch of wheel will better stabilize the tire contact patch, that will help it actually work a lot better and stay in contact with the ground under high G loads. Lots of Fiat wheel fit details on our Fiat 124 wheel page CLICK HERE.

 

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What type of mod will be required for 17x10? Thanks.
 

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Discussion Starter · #56 ·


First shown at SEMA Convention just a few months ago, now arriving and first sets will ship to customers on Friday this week...tomorrow! Very limited numbers to start, just 40 of each to test customer reaction. May put a set on my wife's Supercharged RF and switch them back and forth to our own Fiat 124. Click link below for details.

Konig Hypergram 17x8 4X100 ET45 Carbon w/ Machined Lip
 

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Wow, 17×10 and no cutting and no scraping? If you can pull it off, sign me up. I have your Avanti 17 by 8 and the Roadster Sports exhaust I've never been disappointed in anything I got from you. So looking forward to this.
 

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I'd like to share what DOESN'T fit cleanly:
Tires: 245-40-17
Wheels: 17x8.25 et35
Springs: Flyin' Miata Springs about 1" lowered

Experience: No rubbing on stable road. Rubs on bumps, rubs at full lock.
After mild fender rolling: No rubbing stable road. No rubbing on small bumps. Rubbing on LARGE bumps.
Area of Rub: Front wheels - rubs on front edge of fender, rear edge of front fender, rubs on plastic liners
Are of Rub: Rear wheels - rubs on top edge of rear fender, rubs on rear edge of rear fender and rubs on rear plastic area.

74917
74918
74920
 
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