Tuesday, March 29, 2011

Sealant Corrosion?

Will the sealant corrode my rim? This is a real hot button issue among people who want to go tubeless. The big ruckus was started back in 2009 when Velonews printed these pictures, allegedly of rim corroded through use of sealants. (The picture above is not bicycle related!)

In recent months, Velonews followed up with information from Stan's saying that their is an infinitesimal amount of ammonia currently in his fluid, and that its composition has changed over the years it has been in production.
While the pictures from the first Velonews article are very scary, I have been using sealant on my road tubeless rims for four years now. If there has been any corrosion, I haven't seen it.  I have mostly been using Stan's, but I am also trying the Slime Pro product on one of my bicycles.

As an early adopter of road tubeless technology, my advice is to use your favorite sealant, relax, and enjoy the ride!


  1. Yes indeed, I have thousands of kilometers on Road Tubeless and sealant has saved the day several times.

  2. I'm riding a pair of Dura Ace C24's with Stan's. I definitely have noticed pitting in the rim bed. The pits are deeper near the valve stem hole, likely from sealant buildup. Any advice on how to stop the rim from getting more corrosive short of discontinuing the use of sealant?