I found these Metzeler
If I choose 150 for the rear, they have the exact same size, I assume 160/80 is going to sit higher, am I correct? How much higher?
100/90-19 57 H TL M/C ME 880 MM 90-19
160/80B16 75H REINFORCED REAR

 

I have the ME880 160/80 B16&nbsp\\; - the are slightly wider and taller than the stock dunlops.&nbsp\\; The 150/80 B16 would be slightly smaller due to diferent naming systems.
Don't know abut your front - I have the 21"

 

I heard on the grape vine that metzeler 160s are just as wide as the stock 150. I guess its all in what company you go with. I suck at tire sizes and I could ask a 1000 questions and still have more.

 

If it is taller (or a larger diameter) will it throw your spedometer out? I would think if it's larger it would show a lower than actual speed, may not be enough to matter but on the other hand it may result in a speeding ticket. [:@]

 

The Metz 160 rear will make the speedo read about 3 mph slow at 60 mph, it is slightly taller and wider.