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Breaking Away

Our riders are going away in a break with 2 km to go. Our Standard Rider is on 32 spoke standard wheels. Out Test Rider is on Specialized tri-spokes. Both riders jump at the same time with the same power and initial speed. They are identical in all other respects. Which one gets to the finish line first?

The Specialized rider would be ahead by 14.6 meters or 1.2 seconds and would be riding at about 0.2 meters per second faster.

Enter data for cases of interest to you.

Break Speed Plot

Data Parameters
Parameter Standard Rider Test Rider  
Frontal Area 0.5 0.5 m2
Coefficient Wind Drag 0.5 0.5 dimensionless
Air Density 1.226 1.226 kg/m3
Weight Rider 65.0 65.0 kg
Weight Bike 8.0 8.0 kg
Front Wheel      
Weight 1.264 1.346 kg
Ic 0.0885 0.0904 kg m/s2
Cx0 0.0491 0.0379 Dimensionless
Radius 0.337 0.337 m
Rear Wheel      
Weight 1.804 1.771 kg
Ic 0.0967 0.1032 kg m/s2
Cx0 0.0491 0.0379 Dimensionless
Radius 0.337 0.337 m
Rear Shelter 25. 25. %
Power 350. 350. w
Coefficient of Rolling 0.004 0.004 dimensionless
Grade 0.00 0.00 decimal
Initial Speed 10.0 10.0 m/s

© 1998 Tom Compton