I'm confused. I have always ran Bridgestone L303 3.50X18 on the front of my 06 America but now can't find a new one. I tried using conversion charts to convert the 3.50X18 to metric but came up with a couple of different answers. Is it 100/90, 110/90, or 110/80?

OEM front size is 110/80. I am currently running a 130/70 on my 07 SM. My next front will be a 110/90. All of the above are 18's.

110/80 must be a very uncommon size, can't seem to find any.

https://www.americanmototire.com/search-results?q=110%2F80-18

I'm enjoying my Michelin on the front it made a big difference