The 19/17 combo is mostly for an adventure or dual purpose motorcycle. So you are not going to find as many type of knoobies that you would find on a 21/18 combo.
I also have 19/17 and this is what i run. Plus i agree with what the guy says.
They are 60 on road 40 off road.
If you are going to use the bike 80% of the time off road, then look for a china bike with 21/18
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