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Archive for January 20th, 2008
switching 22.5 to 24.5 & fuel economy
Posted by Harinder Singh from Brampton, ON, CA on January 20, 2008
My Fld120 came with michlin XDA-HT 22.5 tires, 3:90 ratio13 speed .73 ratio.It was ruuning 62 mph @ 1500 rpm, I had them changed to bf goodrich DR444 24.5 now it’s running 62 miles @ 1400 rpm.I was hoping for better mpg, but with the same load,route,speed,weather the new mpg got worse from 6.8 / 7 mpg to 6.35 / 6.5 mpg, Can you explain why.thanks.
Many people make tire changes expecting positive results but forget that new tires with full tread depth will have higher rolling resistance than older tires that are nearly worn out. This could be your issue. Also, it is very difficult to have conditions really be equal in a real world situation. It is difficult enough in a true test situation.