Looking for correct tire pressures for:
Front- 120/70/21
Rear- 200/55/17


Both say max pressure is 42# on sidewalls.


TIA

 

I run 42 rear and 40 in the front and it seems to ride good

 

I run 42 rear and 40 in the front which works for me.

 

The writing on the sidewall is not very useful IMHO! What is the stock rear pressure for your bike? That is probably close enough as a starting point. With both of your tyres, as you are using non-stock sizes you need to experiment a little to find pressures that ride right for you. I have an 18F/17R custom combo and am doing just that.