how wide can tire be?? i have 18x3.5 front whee for trike..l

hi all
how wide a front tire can be run on the harley 18x3.5 inch front wheel of 2011 model bagger?
I will be using it on v6 trike...anyone in the know out there???
thanks magoo

I run 150 width on my 16 x 3.5 and that's probably the max for that rim

thanks for the info...
Harley used 130 ...I would like as much tire on the road as I can get with this rim...I know my sidecar rig slips a bit with stock tire, tight turn under power...if I hit tar strips or something its worse...it can pucker ya up some!!
magoo