Stay away from the -1 up front. My speedo was probably more acurate +2 than it was stock. That might have had something to do with running a 180-55 instead of the OEM 190-50 and the speedo is off the front sprocket so going -1 on the front will throw it wayyyy off.
You could go 3 up in the rear and be happier than +2 -1. I tried it once the bike was very unsettled in corners vs RPM. +2 was almost perfect.
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