If you’re on a budget becoming envious of all the aero bikes out there I’m here to help. I recently discovered an extremely easy D.I.Y bike modification you can make to your bog standard round seat post for optimal aero performance.
Grab a piece of rectangular card which can fit around your seat post.
Whack out some sellotape or duct tape and get to work joining the ends of the cardboard together. Ensure the fin is in line with the rest of the bike and secure the fin to your seat post.
There we go. All done. You've just saved yourself 10 watts. #marginalgains
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