Ever been plagued by the sound of a rattling valve against your rim ? Well, the clever folks at SILCA have come up with a presto valve extender that uses elastomers to put an end to that annoying sound.
This is accomplished by using an elastomer ring on the outside of the extender, which is designed to sit snugly inside the rim’s valve hole and eliminate that dreaded rattle.
The extenders are available in two versions, the FVC (Fixed Valve Core) and RVC (Removable Valve Core). The FVC threads over the stock valve, leaving the head twisted open to accept air. The top of the extension has threads, allowing it to be used with most thread-on floor and hand pumps.
The RVC threads directly into the stock valve and repositions the valve core at its top.
Retail price for the extenders at $34 per pair, and the FVC comes in sizes of 45, 60 and 75mm, while the RVC comes in 34, 45, 60 and 75mm.
Overview
SILCA Valve Extensions solve the two most annoying issues with deep wheel inflation: noise, and air leakage.
That dreaded valve stem ‘click’ has tortured many a deep-section wheel rider over the years, often only discovered after about everything else on the bike has been rebuilt and greased, valve stem ‘clicking’ or rattling occurs when the valve stem moves within the valve hole in the rim, generally on rougher roads. Silca uses a patent pending ribbed gasket which is compressible to both fit more tightly to the hole as well as to cushion any contact between the rim and extension.
SILCA presta valve extensions work by simply threading over top of an open presta valve, and work on both fixed core and removable core Presta valves. SILCA extensions solve air leakage due to poor thread fitment or to stem loosening by using both elastomeric gaskets at the interfaces as well as a thin film sealant on the thread surfaces. There is no need for Teflon tape when using SILCA valve extensions as the sealant for the thread interface is already inside the threads! This thin film seals air-tight and is non-adhesive so your extensions will be re-useable.
SILCA Presta Valve extensions work on ALL Presta valve types, but do NOT move the valve core to the top of the extension. If you are looking for extensions which move the valve core, please look at the SILCA RVC Extensions.
Note: The fitment recommendations given by SILCA are based on common rim dimensions and assume 32mm Valve stem length on your tube or tubular. Some rims have deeper tire wells, and some tubes may use other valve lengths. To ensure proper fit, you should measure the distance from inner rim face to base of tire well. Valve stem, plus valve extension should measure 14-24mm longer than distance between rim inner valve hose and outer valve hole.
SILCA Removable Valve Core Extensions solve the two most annoying issues with deep wheel inflation: noise, and air leakage.
SILCA RVC extensions solve air leakage due to poor thread fitment or to stem loosening by using both elastomeric gaskets at the interfaces as well as a thin film sealant on the thread surfaces. This thin film is non-adhesive so your extensions will be re-useable, but works to eliminate loosening caused by vibration or other factors.
SILCA RVC Extensions work ONLY on tubes and tubulars with Removable Valve Cores. If you need a tube type extension for fixed, or non-removable core tubes, please check out our SILCA Fixed Core Valve Extensions.
http://silca.cc
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