Metric bikes can benefit from the Fuel Tank Tamper, too. The current model is, of course, constructed of 5/8th inch material and designed for "American iron." An FTT for a metric bike will need to be built of 15 mm material. This is all fine and good as long as the bike is in the US. Once the metric bike enters a country that uses the metric system for liquid measurement it will need to be recalibrated from gallons to liters.
Frank, the Real Biker