What kinda car you have again?
I have the Airbar (same thing) and am running 20 x 13 w/345 tires and have no tire fitment issue.
Its close ('bout 3/4") but it fits.
This is on a 69 Camaro.
Even with the leaf test fitting and taking measures, there was like an inch and a half in the front "tire to leaf" contact part (Rear contact part doesn't count because when you use the lower Airbar rod as there's nothing to hit the tire anymore) left before i hit the leaf, ok, now i need to cut the housing some to get the tire in ( like 1 inch to be able to drop the car, max 1 and a half) but its going to fit because the lower bar is 1/2 the size of the leaf. So i have like almost 3/4" clearance from tire to bar leaving the axle pad where it is. Worst scenario, i unweld the front attaching point of the bar to the bushing sleeve and take it in some, adjusting at the axle mount. I already asked Darren why they haven'T built it like the Quadra link, offsetted in the front so the gained space would be 'Built in'.
Hope this helps.
Lead.
Frank, did you start manufacturing those hard covers for the 'vert's tops? I'm getting there!
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LEADFOOT1
New for summer '13. My latest find!!
48k miles, 100% original, 1969 Camaro coupe. Untouched, never apart and squeaky clean!!! 327/th350, A/C car. Gold on black w/vinyl top. Only add ons; Fast ratio box and SS396 wheels.
FINALLY!!! A car without rust repairs ever!!! None before, none coming!!! Cant come to modifying it tough....
...So, '67 Camaro project with my laying around stuff out of my black 'vert. 468 BB and YSI blower, braked th400, 12 bolt/spool, 35 splines etc. Complete Calvert suspension front and rear. 30x13.5 ET Streets, caged, lightened, slammed and running low 9's "Street car" 
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