Question about 1993 Harley Davidson FXR Super Glide
Definitely! When you put a larger or smaller tire it will effect it and so will changing any gear ratios. The speed- o- meter is calibrated for a specific tire size and a certain gear ratio and anything that deviates from that will cause the speed- o- meter to show faster or slower depending on the change. Think if it this way a 16" tire will travel farther in one revolution than a 14" will. Therefore if your car/truck came out with 14" tires and you put 16" tires on it then the speed O meter will show you are traveling slower than what you are. The opposite applies if you downsize. Changing differentials that have a different gear ratio can also affect it. It's a good way to get a speeding ticket. If you put smaller tires on one then the speed- o- meter will show you going faster than you are and it will take more RPM's to reach the same speed, thus causing it to use more fuel.
If you are going to change the tie size or gear ratio very much I would suggest investing in a good Radar Detector! Good luck.
Col. Dana Gillespie
Posted on Mar 23, 2014
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Posted on Jan 02, 2017
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