Motorcycle Tires Michelin

Motorcycle tires, how are they sized?
I have a katana and the recomended tire specs are michelin Front : 120/70 ZR17 (58W) Rear : 150/70 ZR17 (69W) Right now I have Dunlop 170/60 ZR17 (72W) on the rear and a Dunlop 120/70 ZR17 (58W) on the front.
My first question is, how are these tires sized? For example, in the spec rear tire: 150/70 R17 (69W) what each number stand for?
My second question is since I have a 170/60 ZR17 (72W) is that bad or good? Is it over or under?
I can answer some of your question but I’m no bike expert so I don’t know what size should be on.
The first number 150-170 is the width of the tyre in mm.
The second number is the aspect ratio, 70 means the side wall is 70 percent of the tyre width, so the lower this number, the lower the profile of the tyre.
Your new back tyre is 20mm 3/4of an inch wider than your old one and it’s 10 percent lower profile.
The letters R/VR/ZR are the speed band that the tyre can cope with, ZR being the top band 130mph plus.
The next number 17 is the size of the rim in inches
The last number I think is the wear rate of the tyre, how fast the rubber is wearing down.
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