Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Ultimate guide for Airlift Front wheel fitment vs Double Bellow Bag/CUP system

raytrix · 11-13-2014, 01:13 PM

From what I researched, the Airlift front double bellow air bag is roughly 1/2" wider in diameter vs stock struts. 5.5" in diameter to be exact while stock strut/spring is 5" diameter. I currently have coilovers with a CUP system attached to it. The CUP diameter is 4.96" diameter while the coilover itself is 3.5" diameter. I can already verify that I was able to fit a 18x10 +33 wheel up front with 245/35 tire while clearing the CUP system by 1mm at 4.96" diameter (CUP diameter). My assumption is I'll need another 6.35mm (7mm) to clear the Airlift bag if I were to convert to Air suspension now. With that math I can safely say that to fit a 10" wide wheel up front with the Airlift double bellow bag, you will need roughly +26mm just to clear the bag by a hair. Any lower the offset gets will just gain more clearance from the bag. So a safely zone of 18x10 +20 would be ideal to safely clear the bag at all times.

Has anyone figure out a guideline for minimum wheel offset required for 8.5", 9", 9.5", 10", 10.5" wide wheels that will fit up front on both stock fenders, Todoroki 30mm front fender, and Rocket Bunny 50mm front fender.

1 person has confirmed 18x10 +18 to fit at the front with a 225/40R18 tire on stock fender.

11-13-2014, 01:13 PM	#1
raytrix Senior Member Join Date: Aug 2013 Drives: Series 10 FR-S Location: Chicago Posts: 480 Thanks: 234 Thanked 380 Times in 151 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Ultimate guide for Airlift Front wheel fitment vs Double Bellow Bag/CUP system From what I researched, the Airlift front double bellow air bag is roughly 1/2" wider in diameter vs stock struts. 5.5" in diameter to be exact while stock strut/spring is 5" diameter. I currently have coilovers with a CUP system attached to it. The CUP diameter is 4.96" diameter while the coilover itself is 3.5" diameter. I can already verify that I was able to fit a 18x10 +33 wheel up front with 245/35 tire while clearing the CUP system by 1mm at 4.96" diameter (CUP diameter). My assumption is I'll need another 6.35mm (7mm) to clear the Airlift bag if I were to convert to Air suspension now. With that math I can safely say that to fit a 10" wide wheel up front with the Airlift double bellow bag, you will need roughly +26mm just to clear the bag by a hair. Any lower the offset gets will just gain more clearance from the bag. So a safely zone of 18x10 +20 would be ideal to safely clear the bag at all times. Has anyone figure out a guideline for minimum wheel offset required for 8.5", 9", 9.5", 10", 10.5" wide wheels that will fit up front on both stock fenders, Todoroki 30mm front fender, and Rocket Bunny 50mm front fender. 1 person has confirmed 18x10 +18 to fit at the front with a 225/40R18 tire on stock fender.