So a buddy and I were at Ocatillo last weekend and we did a GPS speed test in 5th pinned. Both on the pavement and in the dirt... Check it out... His 00 XR650R - He's 215 lbs 6 foot 5, has the edelbrock carb, new tire (maxxis IT w/ 100 miles on it) and a suspension that was just done by Barnum. 4.6 desert tank 1/3rd full. 15/48 gearing. Top speed in the dirt was 80 and on the pavement it was 95. My 00 XR650R - I'm 240 lbs 6 foot 7, stock carb, 14/48 gearing, 4.6 dez tank 1/3rd full. Teraflex rear tire so +8-10 lbs which is 80% worn out, Top speed in the dirt was 80 and on the pavement was 95. On the pavement test we were side by side on the 78 and neither of us could pull away at all. Side by side for a about a mile both 5th pinned... So riddle me this... How can I be 25 lbs heavier, have 8-10 more lbs on the rear wheel 14/48 gearing compared to 15/48 gearing and we are dead even? He should be spanking me with less weight and higher gearing. Any ideas? Does anyone still have that chart Quadsan had showing gearing/speed ratios? We both think my compression is a little better so would that make the difference?