How to Calibrate Your ZRX Speedometer for…FREE!

Done with my Garmin GPS and a dry erase marker on my gas tank.

Stock, non-molested ZRX Speedo, Michelin Power Race 120/70-17, about 90% tread depth.

Each reading at least triple checked.

Indicated Actual
25 17
30 22
40 31
50 40
60 50
70 59
84 70
85 72
88 75
90 77
93 79
95 81

Mark the Bell and frame with a Sharpie at an actual GPS verified 80 mph…I use 80 because that is cruzing speed in Arizona. If you ride thru a zillion school zones use 15 mph on yours. On my speedo 80 mph actual was a schosche over 93 mph indicated.

Rotate the needle to 80 mph while holding the Bell. The needle rotates really easily. Double check you have the Sharpie marks aligned and the speedo at 80 mph.

Reinstall and now when the speedo says 80 mph you are actually GOING 80 mph.

 

Cart
Your cart is currently empty.