Then came 2U, 3U, 4U, ...... . Thank you for the info. So, it is one step-down of 5gr in weight, for each higher number denoted (in the U). Wonder if they will make lower weights (like 5U and/or 6U) in future? .
We already are at 5U with Yonex in the ArcSaber 6 and FB and also there is another step lighter but instead of calling it 6U they have introduced the "F" category. So to continue/finish off: 5U: <80gr. F: <75gr. Doubt we'll get lighter ones but we might see 2F, 3F, rather than U from there on.
"F" category specifications . I must go find to try the "F" specifications rackets. Guess they could be excellent for Doubles play. .
Probably some more brands with rackets in the 70's (whether or not true weight) but not sure if they use the same weight system or just give the average weight +/- x grams. That would be the ArcSaber FB (FlashBoost) in the lighter of two weights available (5U and F) http://yonex.com/products/badminton/racquets/arcsaber-series/arcsaber-fb
ArcSaber FB (FlashBoost) . Thank you for the info/link. So currently, the lightest racket in YONEX's history is the ArcSaber FB (FlashBoost) at 73g. Surprise to find that YONEX has decided to produce it with only a stiff flex. .
get it The weight is denoted by "U"; the smaller the number, the heavier the weight. The grip size is denoted by "G"; the smaller the number, the larger the handle size. The racket tension is denoted by "x lb to y lb"; the minimum to the maximum stringing tension recommended.