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Technical FAQ: Water in the frame

  • By Lennard Zinn
  • Published Oct. 6, 2009
  • Updated Aug. 29, 2010 at 10:43 PM EST

Question: My friend has a new Felt AR2 and on the weekend we went out for a long ride. Rain was on and off but never to the point where we were soaked. So today doing some after weekend maintenance, we noticed some water dripping out of the seatpost when turned upside down. Water continued to trickle so we decided to take out the post and drain it. We drained a good 8-12 oz. of water out of the bike.

It seems like water enters the frame on the trailing edge of the aero seatpost. I suggested using some silicone sealant to close up that gap but we are unsure about any reactions with carbon. Maybe an Oxygen Sensor Safe Sealant would work best.
Katsu

Dear Katsu,
You needn’t worry about a reaction between a carbon frame and silicone sealant. And as long as you’re not running gasoline in that bike, there’s no need for Oxygen Sensor Safe Sealant, although that also could do the trick.
Lennard

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Lennard Zinn

Lennard Zinn

Our longtime technical writer joined VeloNews in 1987. He is also a framebuilder, a former U.S. National Team rider, and author of many bicycle books, including Zinn and the Art of Mountain Bike Maintenance and Zinn and the Art of Road Bike Maintenance, as well as Zinn and the Art of Triathlon Bikes and Zinn's Cycling Primer: Maintenance Tips and Skill Building for Cyclists. He holds a Bachelor’s degree in physics from Colorado College. Readers can send brief technical questions to Ask LZ.

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