Just measured - my Peavey Grind 6 is 16mm spacing! I'm surprised! When I play 4 strings I'm very very happy with 19mm spacing. With 5 strings I really like the stingray spec, whatever it is (17? 17.5?) It turns out that I really love 16mm spacing on a 6. I owned other 6 (and non-octave 8!) string basses in the past, by the way, such as BTB, with wider spacing. 16mm, according to everything I've been searching up here on talkbass, is a VERY narrow string spacing. I can slap as well as I ever could (which is perfectly functional slap style but without particularly useful double thumbing or other showy stuff), I can play any style just fine on it (at least no worse than on any other basses LoL), I have less trouble with string muting and stretching than on other 6 strings I've played, I don't love the 35" scale length but can live with it (I also hear no advantage at all so far, it's fine but no better than my 34" scale B strings on my ernie ball and carvin basses). So yea, 16mm is totally awesome, for me at least, on a 6 string bass. Who else likes much narrower width with more strings? Edit: oh, and I intentionally put this into the Basses forum, because it really is about basses. It's not a setup thing, it's something in the design of your bass, and the choices there-of.