Quote:
Originally Posted by slicer
You can add Öhlins TTX to your list of suspension that can accommodate wide front wheels/tires
-6" main spring
-No helper
-Full travel (more than 5" spring on the other kits)
-Spring preloaded - therefore no need for helper
-Lower mounting point to car hub/knuckle is adjustable- therefore ride height can be adjusted in both spring perch and lower mount point.
I have been able to fit:
10.5et25 and 11 et18 with 295/30/18 tires
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Good info on the TTX system, Brett.
Quote:
Originally Posted by SYT_Shadow
I'm still waiting for you to tell me how I can fit 11et44 square on my M3 F80!
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Shoot, you're right! My apologies for letting that slip.
For F8X M track junkies and club racers looking to push the limits beyond the standard 18x10" ET25 rotatable square fitment, and 18x10" ET25 front / 18x11" ET44 rear staggered fitment, there are a few 10.5" and 11" square fitments available. Each has pros and cons, and this topic has come up often enough over the last few years that we'll be writing a more detailed article beyond what is already available on our F8X M chassis specific fitment guide.
Keep in mind, the height/diameter of the front tire is a major limiting factor here. Of the few F80 drivers running aggressive 18x11" square fitments, most are running 295/30-18, 295/35-18, or 305/645-18 Pirelli PWC DH tires (which is more like a 305/
30-18). Many would like to run a DOT approved 305/35-18 tire such as a Nitto NT01, but they would rub significantly up front upon hard cornering, etc.
Here is a copy and paste from another thread I replied to:
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Fitting an 18x11" Square Setup
For most enthusiasts, 18x10" ET25 front, 18x11" ET44 rear staggered fitment is most effective for both street and track duty. Pair these with 275/35-18 tires up front and 305-35-18 tires in the rear respectively and you have a great bolt-on fitment. With that said, many of our clients are serious track nuts or compete W2W on some level. Not only are they looking to maximize grip, but they would like a square fitment for a well-balanced chassis with the ability to rotate wheels and tires on all four corners.
In order to rotate effectively, the wheel specifications needed to be cohesive from front to rear. This means that either the front or rear will need some level of "work" to properly fit an 11" square fitment.
Option 1: Front & Rear: 18x11 ET44
The 18x11" ET44 was specifically designed for the rear of the F8X chassis, so naturally this is a direct fit out back. When we install these up front however, thick spacers are required for proper strut clearance. Breizh Motorsport's chose to go this route and installed 25mm spacers to clear their suspension. Keep in mind, spacer thickness will depend on the front tire brand and suspension type, as not all are created equal. An 11" ET44 wheel paired with a 25mm spacer gives us an effective offset of ET19, so this ends up being quite an aggressive fitment on the outside/fender side and a healthy amount of negative camber will be required to bring the top of the tire in under the front fenders. Since you will (should) only find this type of fitment in the hands of hardcore track junkies and club racers, aggressive negative camber specs are par for the course and not a limiting factor.
Option 2: Front & Rear: 18x11 ET25
The 18x11" ET25 was specifically designed for the rear of the E9X M3, and in this scenario it is better suited for the front end of the F80 as the lower offset supplies much more inner strut clearance. Naturally, this transfers the focus to the rear of the car, where the 18x11" ET25 is very aggressive (28mm more aggressive then the factory 19x10" ET40 rear wheels). In an effort for these to work when the car is put through its paces on the race track, rear fender modifications will likely need to be performed in the form of "pulling/re-shaping" in combination with additional negative camber. Brett Strom from Strom Motorsports is well versed in this arena and no stranger to modifying factory fenders, therefore he chose to go this route. In some cases we have reports of customers (MasterP) using this square fitment with 305/645-18 Pirelli PWC DH tires
without needing to modify the rear fenders, however adding -2 degrees or more of camber in the rear was still necessary.
In conclusion, neither of these 11" square fitments are considered "bolt-on fitments" and should only be reserved for serious track/race cars. It is important to note that regardless of which offset you choose to use, compliant track oriented suspension equipped with short linear springs and a spring perch location above the front tires will be required to maximize inner clearance to the strut.
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Then you have a 18x10.5" rotatable square fitment option that is a bit easier to implement.
Front & Rear 18x10.5 ET40
305/645-18 Pirelli DH slicks
20mm front spacers
- Ryan