I am pretty sure it is ordinary 1/4" grommets from the electrical section. On double wall rims you don't even see the grommet which is nice...
Doug Van Cleve chilly Chandler, AZ USA (below freezing last night)
On 1/15/07, Steve Demchak <rabbickup@yahoo.com> wrote:
> At 11:34 AM 1/14/2007, John Barron wrote:
> >Is there any problem using innertubes with presta valves on rims
> >that have larger valve holes intended for Schrader valves?
>
> I used rubber grommets that I purchase at the local hardware store. They are intended to be used to protect wires going through drilled holes in sheet metal. They look like tiny black rubber donuts (or bagels) that have a groove running around the perimeter. They fill the space between the stem and rim quite nicely.
>
> Steve Demchak
> Seattle, WA
>
>
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