When I dropped in Sponic Springs the 7wt was what was recommended by them. Works good so far and if I want to go a little lighter or heavier I can do that with the Belray easy enough. No mixing SS7/SS-8. Just buy the weight I want.I'm trying out the Bel Ray 7 wt. in my next fork oil change. Also will be switching to flat rate springs as a suspension upgrade, so I won't be able to compare the SS-8 that's in there now with the Bel Ray 7 wt.