on 8/17/04 7:38 AM, HM & SS Sachs at firstname.lastname@example.org wrote:
> Charles Nighbor wrote:
>> For the below why couldn't one just place a piece of thin metal with
>> the proper presta hole size and width under the rim tape. That would
>> convert Schraeder-valve rims to Presta and the air pressure on the rim
>> tape and the rim tape would hold the metal pice in place. I suggest
>> you try it first.
> Good suggestion, and I did try that first, about 1970. At the time, the
> issue was a bit different: SuperChamp (58?) rims have a deep center
> "well", and I had problems with valves that did not sit down in the
> well. So, used various combinations of metal and even silicone bath
> caulk to build up the area.
> Since then, it seems that Presta valve construction has changed. The
> base of the valve is more slender, but actually close to the diameter of
> the Schraeder hole. In the particular instance this week, with another
> deep-well rim, I did make a thin metal washer adapter, but the hole size
> that fitted the valve didn't leave side clearance for the washer in the
> well. The grommet has the drawback of being visible, but the a
> advantage of being easy to do and very compliant.
> So, thanks for reminding all of us of this alternative.
> harvey sachs
> mcLean VA
I forget the brand but there used to be a product made to address this issue. Perhaps it is still available. It was a short section of aluminum tubing with a tiny flange. The tube takes up the difference in diameter and the flange keeps it in place.
Jamie Swan - Northport, N.Y.