TT/ Tri VS Road Bike- How much faster?

TT/ Tri VS Road Bike- How much faster?

If there's one question that I am asked more than any other question, it's "how much faster is a TT bike than a Road bike?  To answer the question I went into the FASTER Wind Tunnel in Scottsdale, Arizona to find out.  FASTER is now closed; A2 Wind Tunnel in Mooresville, North Carolina is a great facility for testing cycling aerodynamics.  Comparing my Canyon Speedmax with my Canyon Ultimate: my lowest drag Road bike position (bar tops & hands close together, near the center) required 204.6250 watts to maintain 30 mph with a CdA of .2770 compared to my lowest drag TT bike position which required just 177.2925 watts to maintain 30 mph with a a CdA of .2400.  That's a difference of 27.3325 watts or 13.36%.  And, compared to my more comfortable Road bike position (on the brake hoods) which I could sustain for a long period of time, there was a difference of 62.0523 watts or 25.95%, nearly 26%. The tables and graphs below provide more detail about the tests.

FASTER aerodynamic research center
V=13.4112 m/s (48.2803 kph)
paul lew
bike clothing position aero watts CdA
canyon ultimate road kit brake hoods 239.3448 0.3240
canyon ultimate road kit drops 226.7866 0.3070
canyon ultimate road kit bar top (hands near center) 204.6250 0.2770
canyon speedmax road kit aero bars 187.6345 0.2540
canyon speedmax tri kit aero bars 177.2925 0.2400

 

 

                                         

BRAKE HOODS/ ROAD KIT

AERO BARS/ TRI KIT

DROPS/ ROAD KIT (NO IMAGE)
BAR TOPS/ ROAD KIT (NO IMAGE)
AERO BARS/ ROAD KIT (NO IMAGE

 

RAW DATAPaul Lew, "Bicycles make friends"