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The KM-40 Airfoil

The Europeans still call it The Race of Truth: Just you, the bike, and the clock. To this merciless discipline Kestrel humbly dedicates the KM40 - every inch of it designed, tested and re-designed to yield just one result: the near perfect translation of muscle power into forward speed. The KM's geometry is specifically tuned to the flat-back time trial position, while the design's outstanding vertical compliance isolates the rider from bumps and road shock. The massive downtube is both exceptionally stiff and aerodynamically optimal; 650c wheels and our unique seat tubeless design make the KM one of the slipperiest bikes on the Queen K Highway...or anywhere else. No wonder Kestrels (and, increasingly, the KM) have proven themselves the most popular bike at the Ironman, year after year. KM40 Airfoil: 3.1 lbs, one-piece frame with EMS Pro/650 fork. Available as frameset or complete bike.

KM40 Airfoil "Aloha" Limited Edition available in 52cm frame size only


Seat Tube 52 56
Standover 74 79
Top Tube 53 57
Head Angle 72.75 72.75
Seat Angle 77 76
B/B Height 10.4" 10.4"
Chainstay 39 39
Fork Rake 3.4 3.4
Drop 4.5 4.5
Trail 6.1 6.1
Front Center 59.4 62.5
Wheelbase 97.9 101.2
Bottom Bracket 68mm, English Threaded
Seat Post Diameter 27.2mm
Front Derailleur braze-on
EMS Pro/650 Fork 650c x 1", threadless


Shimano Aero Ultegra Aero* Dura Ace Aero*
*Available through Authorized Kestrel Dealers.


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Kestrel Bicycles | 5300 Soquel Avenue, Suite 101 | Santa Cruz, CA 95062 USA
phone: 831-464-9079 | fax: 831-464-9069 | email us