I am not going to mention other organizations by name but there are some clear advantages to racing WERA vintage classes. Most WERA classes are by bike configuration. This makes the classes very inclusive. Some organizations classes have a bike list for some popular classes and if you are not in the bike list, you don't run. I have tried and NO EXCEPTIONS even if your bike should be in the group. WERA appears to have more flexibility as to tires and rims than some other organizations. I prefer the best rubber possible. WERA is more open to bike set up for attributes that are not as important. One organization requires original fairing or reproductions. For many bikes that means finding overpriced beat up eBay stuff or nothing. WERA has this forum where we can learn about racing, bike set up, bikes for sale from people with history or just goof around some. Come out and have fun with WERA!