Do your home work first, A certain size it does not mean the Diameter and width are going to be the same. Metzlers are a tad smaller in Dia. and taller than some other brands. Go to each tire manufacture on line and print out the tire spec charts. This is what I found for my 06 heritage, a dunlop 150/80/1671h is 25.25 dia,6.25 width,8/32 tread. a metzeler 150/80/16 71h is 25.45" dia, 5.85" width, 8.0mm tread depth. a Avon Venom AM42 150/80/16 77V is 25.20" dia,6.20" A Metzeler 150/80/16 is really a 140/80/16 in the real dia. and width compared to a stock dunlop or Avon. The Diameter makes a difference in the gearing. not to lug or to lug.
"The Black Pearl" It's not just a bike with wheels,or a handlebar to change your course,and a comfortable saddle, "It's freedom"