Easy Instant Cheapest Most Sensible Effective Proven Aero / Aerodynamic / Performance Part Product Accessory

....a WATERBOTTLE ON THE DOWNTUBE. 7.5 seconds faster in 10km. 30 seconds faster in 40km or approx. 75g less drag thanks to simply putting a standard waterbottle in its usual place onthe downtube bottle cage.

*On the average bike trip that most of us daily cyclists do (2-5km) to go to n from work...that 3 seconds faster on every trip! That can be the difference between catching the bus/subway and missing it. And yes, I am living proof of that.*

So, GET yer DOWNtube bottle on folks! It'll make you faster!
Unless you have a wicked new CYCPRO or equivalent Softride, Zipp or Lotus bike in which case you'd have the fastest bike on the market regardless ofthe downtube bottle.

My source: John Cobb and his test results from the Texas A&M wind tunnel:

The quick numbers results:

	Ave. Drag	40 km	112 mi
base bike, no bottles	7.537	1:07:26	5:56:48
down tube bottle only	7.370	1:06:58	5:54:29
seat tube bottle only	7.433	1:07:09	5:55:22
bottles on both tubes	7.598	1:07:36	5:57:38
Profile bottle only	7.337	1:06:53	5:54:01
Hydropac w/40oz. only	7.556	1:07:29	5:57:01
Never Reach only	7.561	1:07:30	5:57:07
behind-seat low bottles	7.658	1:07:45	5:58:27
behind-seat high bottles	7.578	1:07:32	5:57:27

Whole article:
http://www.slowtwitch.com/mainheadings/techctr/waterbottles.html