How far can you take the BG's down and still get performance out of them. Mine are low , I still can see the tread pattern. Looks like I have an 1/8 or 1/16 left?

 

Until they stop hooking good or until the cord almost shows - whichever comes first.

 

mine are bald and still getting 1.8s off tickover launch (stockA4), keep going!

 

on mine i cant see thread pattern and my 60 fts are a lousy 2.18 and have been getting worse so mine are done! btw i cant say i didnt get my money worth since i bought them for 50.00 bucks in 2000 and my best 60 ft with them was a2.13 in o1 and the 2.18 was in aug.04.