Just picked up a 2004 fxdx and it has a metzler on that back and I wanna go back to a Shinko like my other fxd. The only number I found on the current tire is 30-18-23 I'm not sure if that is the tire size or what. When I went on to the internet I found a handful of shinkos but I'm not positive on the size I need.
Ive found these sizes
Rear / 150/90B15 80H (Reinforced)
Rear / 150/80B16 77H (Reinforced)
Any help on what tire will work would be great.

 

my fxdx has a 150/80/16

just check you rim size. you posted 2 different size tires for 2 different wheel sizes

 

150/80 is the correct size.. Was what came on my 00 DX.. Tire size did not change..

 

I agree with 150/80-16