I've bought a pair of wheels for commuting and my bontrager ones I'm using for racing.
I'll have a look at the Vittoria ones but out of curiosity why use latex ones for racing are the lighter. ?
BUTYL INNER TUBES
The vast majority of inner tubes sold for bicycling purposes are made from butyl rubber (full name “polyisobutylene”). This material is a synthetic rubber and is the most popular material type due to a combination of properties that tend to be the best overall compromise for training, racing, and overall general use. Butyl tubes are generally molded and vulcanized in a single piece construction that eliminates joining seams.
Pros
* Inexpensive
* Good air pressure retention – low air diffusion over time
* Durable
Cons
* Relatively inelastic – higher losses from flexing
* More susceptible to “pinch” type (i.e. “snakebite”) flats
LATEX INNER TUBES
A more specialized tube material that's typically used in “high performance” tubular tire models and is available for use in clincher tires is a form of natural rubber known as latex. This highly elastic rubber material is the same type of material as is used in common party balloons and some types of surgical gloves. The main advantageous feature of this material is it's elasticity, or it's ability to be stretched, or deflected by large amounts and then return to it's unloaded state with very little hysteresis, or energy losses, due to the deflection. Because of this property, the use of latex tubes in a bicycle tire tends to give the combination of tire and tube a lower overall rolling resistance as compared to the same tire with a butyl tube. Depending on the tire, the rolling resistance can be lowered by as much as 10-15%. This can result in a power savings of ~5W for a typical rider, which is not an insignificant amount. For example, over an Ironman distance bike leg (180 km) this would result in a time savings of ~1-1/2 minutes.
Pros
* Highly elastic – low energy losses from deflection
* Good resistance to flats from impacts (“snakebite” flats)
Cons
* Relatively expensive – typically 2X-3X the cost of butyl
* Higher air diffusion – need to check pressures more often
* More sensitive to installation technique for clinchers
Due to their higher cost and relative sensitivity to installation technique and rim tape condition, latex tubes are typically reserved for “race wheel” use.
HTH