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My Shimano motor is the ep8 800 not the updated 801 and it does not appear to offer any option to enter tire size to calibrate. The Drive Unit section just shows 20 mph and an option for zero, plus 0.5, or -.5. I'm hesitant to check for updated firmware , which was updated in December of 2025...

My 2023 Norco Bigfoot VLT with a Shimano ep8 is robbing me of about 3 miles per hour short of 20 miles per hour by virtue of the factory set calibration. Is there a way I can properly calibrate without using banned third party software? And without having to take it to a dealer? @Greg Watts