It's 1mm per string, and believe it or not, it makes a pretty noticeable difference when you're playing. At least it does for me.Then just get an aftermarket 18mm bridge. There's really not much difference b/w 18 and 19mm. I believe it's something like 1mm.![]()
That said, you're right. Swap the bridge, no biggie. The only way you can't go, is wider... say 19mm on an 18mm or 17mm (string-string) bass... in many, maybe even most cases, the highest string ends up too close to the edge of the fingerboard and you find yourself ganking it off the edge too easily.