Analytic Cycling Logo Criterium Corner

Jumping From Criterium Corner

Our standard rider is on 32 spoke standard wheels. Our test rider is riding Specialized tri-spokes. Both riders jumped from a criterium corner with the same initial speed. The riders are the same in all other respects. For the same power output, which one will be ahead at the end of 100 meters? By how much?

The motion equations say that the rider on the Specialized wheels will be ahead by 18 cm after 100 meters, or about 0.015 seconds even though the Specialized wheels are heavier by 49 gm and have higher rotational inertia.

Enter data for cases of interest to you.

Distance Difference vs. Time

Distance Difference vs. Time


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  25.00  25.00  % 
Power          
Max Power  550.  550.  w 
Ave Power  350.  350.  w 
Time at Max Power  3.7  3.7  s 
Period  30.  30.  s 
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