BG-66 Ultimax is of Yonex brand and has a high repulsion balance and maximum power, ZyMax 62 has a repulsion power same as of .70 mm string at 30 lbs. #2 mani60 , Jan 6, 2012 Tornoni Regular Member
Charlie-SWUK Regular Member. No.1 is a better substitute for 66UM than 65Ti. It is *the* substitute for 66UM. Both 65Ti and No.1 have a harder feel than 66UM, but neither are as hard as BG80. If BG 80 is a 10, 66UM is a 5, No.1 is a 7~8, and 65Ti can vary greatly from a 5 to an 8/9 depending on if you want to push mid 30s.I did tried bg 80, bg 65 and bg 85 bg 80 for me not to good because it to soft ( tension 26) and only use a couple week the tension loss about 2-3 pounds bg 85 very good on power and placement but same as bg 80 it easy to loss tension here I rate sting I had used bg 66: s (sound) : 9 d (durabillity) : 6 p (power) 9.5 c (control) 8.5 bg 85