Right now I've got it tuned way up to CGCGC to work with my six strings, but I'm thinking about tuning my seven string to GCGCGCE, & I'll need to re-string the bass to match the tuning. Last time I had it strung up for drop A tuning I used a standard four-string set & added a .135 low string (it's currently got a real light 5 set on it now). Think the .135 can handle the low G? I had to drill the bridge for that thing to fit, I don't know if I'll be able to fret anything much bigger! :p

Depends on the bass. If it's a long enough scale (more than 34") and has a good neck you'll probably be fine. Otherwise it's a gamble.

I have a .135 on the low B on my 5-string (34" scale) and I really don't think it would cut it for a low G

It's a 35". I'll probably get a 135 & 140, & start out with the 135.

Just a heads up, Byron was going GCGCF (incase it was of interest)