We moved the gusset out more on the JBA UCAs to get more strut clearance and down travel, with doing that there is interference with oversize tires on factory wheels.
Tire sizes that work well with the JBA-7.0.HC.EZ UCAs on factory wheels
- 265/75R16 tire 31.6" x 10.4" on factory wheels
- 275/70R17 tire 32.2" x 10.8" on factory wheels
- 255/75R17 tires 32.1" x 10" on factory wheels
- 275/65R18 tires 32.1" x 10.8" on factory wheels
- 245/75R17 tires 31.5" x 9.6" on factory wheels
- Any tire that is 32.2" diameter and smaller there is no fitment problem.
Check your tire size go to https://tiresize.com/calculator/
Check your wheel size and backspace go to https://www.wheel-size.com/
Wheel offset chart at bottom of this page.
The charts below will help you see what wheel and tire combo will clear the JBA-7.0.HC.EZ UCAs.
Note: The critical dimensions are tire diameter, any tire over 32.5", width of tire, width of wheel & wheel backspace or offset. This is only tire to a-arm clearance, you may still need to do body mount chop and clearance the wheel wells and front bumper.
What you need to from your vehicle, tire width, wheel width & wheel backspace
Oversize tires
BFG K02s at 33 x 12.5" wide tire:
12.5" wide tire, if the factory wheel is 7" wide, you need a 3.25" backspace or smaller to clear the JBA ucas.
12.5" wide tire, if the factory wheel is 7.5" wide, you need a 3.50" backspace or smaller to clear the JBA ucas.
12.5" wide tire, if the factory wheel is 8" wide, you need a 3.75" backspace or smaller to clear the JBA ucas.
12.5" wide tire, if the factory wheel is 8.5" wide, you need a 4.00" backspace or smaller to clear the JBA ucas.
12.5" wide tire, if the wheel is 9" wide, you need a 4.25" backspace or smaller to clear the JBA ucas.
12.5" wide tire, the above will have .225” tire clearance to the JBA arms at full lock of the steering wheel, with that wheel and tire setup. If you need a smaller back space a wheel spacer is needed, most common spacer is 1.25" thick. This is only tire to a-arm clearance, you may still need to do body mount chop and clearance the wheel wells and front bumper.
BFG K02s at 315/70 R17 (34.4" x 12.4") 12.4" wide tire:
12.4" wide tire, if the factory wheel is 7" wide, you need a 3.50" backspace or smaller to clear the JBA ucas.
12.4" wide tire, if the factory wheel is 7.5" wide, you need a 3.75" backspace or smaller to clear the JBA ucas.
12.4" wide tire, if the factory wheel is 8" wide, you need a 4.00" backspace or smaller to clear the JBA ucas.
12.4" wide tire, if the factory wheel is 8.5" wide, you need a 4.25" backspace or smaller to clear the JBA ucas.
12.4" wide tire, if the wheel is 9" wide, you need a 4.50" backspace or smaller to clear the JBA ucas.
12.4" wide tire, the above will have .025” tire clearance to the JBA arms at full lock of the steering wheel, with that wheel and tire setup. If you need a smaller back space a wheel spacer is needed, most common spacer is 1.25" thick. This is only tire to a-arm clearance, you may still need to do body mount chop and clearance the wheel wells and front bumper.
BFG K02s at 295/75 R16 (33.4" x 11.6") 11.6" wide tire:
11.6" wide tire, if the factory wheel is 7.0" wide, you need a 3.75" backspace or smaller to clear the JBA ucas.
11.6" wide tire, if the factory wheel is 7.5" wide, you need a 4.00" backspace or smaller to clear the JBA ucas.
11.6" wide tire, if the factory wheel is 8" wide, you need a 4.25" backspace or smaller to clear the JBA ucas.
11.6" wide tire, if the factory wheel is 8.5" wide, you need a 4.50" backspace or smaller to clear the JBA ucas.
11.6" wide tire, if the wheel is 9" wide, you need a 4.75" backspace or smaller to clear the JBA ucas.
11.6" wide tire, the above will have .175” tire clearance to the JBA arms at full lock of the steering wheel, with that wheel and tire setup. If you need a smaller back space a wheel spacer is needed, most common spacer is 1.25" thick. This is only tire to a-arm clearance, you may still need to do body mount chop and clearance the wheel wells and front bumper.
BFG K02s at 285/70 R17 (32.7" x 11.2"), BFG K02s at 285/75 R16 (32.8" x 11.2") 11.2" wide tire:
11.2" wide tire, if the factory wheel is 7.0" wide, you need a 4.00" backspace or smaller to clear the JBA ucas.
11.2" wide tire, if the factory wheel is 7.5" wide, you need a 4.25" backspace or smaller to clear the JBA ucas.
11.2" wide tire, if the factory wheel is 8" wide, you need a 4.50" backspace or smaller to clear the JBA ucas.
11.2" wide tire, if the factory wheel is 8.5" wide, you need a 4.75" backspace or smaller to clear the JBA ucas.
11.2" wide tire, if the wheel is 9" wide, you need a 5.00" backspace or smaller to clear the JBA ucas.
11.2" wide tire, the above will have .125” tire clearance to the JBA arms at full lock of the steering wheel, with that wheel and tire setup. If you need a smaller back space a wheel spacer is needed, most common spacer is 1.25" thick. This is only tire to a-arm clearance, you may still need to do body mount chop and clearance the wheel wells and front bumper.
BFG K02s at 275/70 R18 (33.2" x 10.8") 10.8" wide tire:
10.8" wide tire, if the factory wheel is 7.0" wide, you need a 4.25" backspace or smaller to clear the JBA ucas.
10.8" wide tire, if the factory wheel is 7.5" wide, you need a 4.50" backspace or smaller to clear the JBA ucas.
10.8" wide tire, if the factory wheel is 8.0" wide, you need a 4.75" backspace or smaller to clear the JBA ucas.
10.8" wide tire, if the factory wheel is 8.5" wide, you need a 5.00" backspace or smaller to clear the JBA ucas.
10.8" wide tire, if the wheel is 9" wide, you need a 5.25" backspace or smaller to clear the JBA ucas.
10.8" wide tire, the above will have .075” tire clearance to the JBA arms at full lock of the steering wheel, with that wheel and tire setup. If you need a smaller back space a wheel spacer is needed, most common spacer is 1.25" thick. This is only tire to a-arm clearance, you may still need to do body mount chop and clearance the wheel wells and front bumper.
BFG K02s at 255/85 R16 (33.10" x 10") 10.0" wide tire:
10.0" wide tire, if the factory wheel is 7.0" wide, you need a 4.50" backspace or smaller to clear the JBA ucas.
10.0" wide tire, if the factory wheel is 7.5" wide, you need a 4.75" backspace or smaller to clear the JBA ucas.
10.0" wide tire, if the factory wheel is 8.0" wide, you need a 5.00" backspace or smaller to clear the JBA ucas.
10.0" wide tire, if the factory wheel is 8.5" wide, you need a 5.25" backspace or smaller to clear the JBA ucas.
10.0" wide tire, if the wheel is 9" wide, you need a 5.5" backspace or smaller to clear the JBA ucas.
10.0" wide tire, the above will have .225” tire clearance to the JBA arms at full lock of the steering wheel, with that wheel and tire setup. If you need a smaller back space a wheel spacer is needed, most common spacer is 1.25" thick. This is only tire to a-arm clearance, you may still need to do body mount chop and clearance the wheel wells and front bumper.
| Wheel Width | Wheel Backspace in Inches |
||||||||||||||||||||
| 3.25 | 3.50 | 3.75 | 4.00 | 4.25 | 4.50 | 4.75 | 5.00 | 5.25 | 5.50 | 5.75 | 6.00 | 6.25 | 6.50 | 6.75 | 7.00 | 7.25 | 7.50 | 7.75 | 8.00 | ||
| 5.0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | 57 | 63 | 69 | 76 | |||||||||
| 5.5 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | 57 | 63 | 69 | 76 | ||||||||
| 6.0 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | 57 | 63 | 69 | 76 | |||||||
| 6.5 | -12 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | 57 | 63 | 69 | 76 | ||||||
| 7.0 | -19 | -12 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | 57 | 63 | 69 | 76 | |||||
| 7.5 | -25 | -19 | -12 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | 57 | 63 | 69 | 76 | ||||
| 8.0 | -32 | -25 | -19 | -12 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | 57 | 63 | 69 | 76 | |||
| 8.5 | -38 | -32 | -25 | -19 | -12 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | 57 | 63 | 69 | 76 | ||
| 9.0 | -44 | -38 | -32 | -25 | -19 | -12 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | 57 | 63 | 69 | 76 | |
| 9.5 | -51 | -44 | -38 | -32 | -25 | -19 | -12 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | 57 | 63 | 69 | |
| 10.0 | -57 | -51 | -44 | -38 | -32 | -25 | -19 | -12 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | 57 | 63 | |
| 10.5 | -63 | -57 | -51 | -44 | -38 | -32 | -25 | -19 | -12 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | 57 | |
| 11.0 | -69 | -63 | -57 | -51 | -44 | -38 | -32 | -25 | -19 | -12 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | 51 | |
| 11.5 | -76 | -69 | -63 | -57 | -51 | -44 | -38 | -32 | -25 | -19 | -12 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | 44 | |
| 12.0 | -83 | -76 | -69 | -63 | -57 | -51 | -44 | -38 | -32 | -25 | -19 | -12 | -6 | 0 | 6 | 12 | 19 | 25 | 32 | 38 | |