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(above & right) Due to the gear swap (2.76 vs. 2.94) and tall tire combination (28inches), we had no way of accurately measuring our speed. So, wecontacted Garmin Industries, maker of some of the most cutting edgeGlobal Positioning Satellite (GPS) units. They provided us with one oftheir GPS V systems. We used three of its many functions during theNORC: real speed, average speed, and the trip meter.