

| Flex | medium |
| Balance | Head Heavy |
| Weight / Grip | 3U / G4,G5,G6 4U / G5,G6 |
| Max Tension | 3U: 29 lbs 4U: 28 lbs |
The Yonex Astrox 77 Tour is designed for aggressive players seeking strong rear-court crashing smashes paired with solid control. According to Yonex's official spec page, it features a medium flex shaft.
It comes in two variants: 4U (G5, G6) and 3U (G4, G5, G6). The official stringing advice is up to 20-28 lbs for 4U and 21-29 lbs for 3U.
While Yonex does not explicitly label the balance category in the spec sheet, retail listings frequently describe this model as having a head-heavy balance, making it well suited for steeper attacks and aggressive play.
Key tech includes: HM Graphite frame, Light Feel Carbon NEO, Nanomesh NEO shaft, Built-In T-Joint, and 10 mm longer length (for improved shuttle hold and leverage).
A medium-flex shaft provides a comfortable balance between power and control, suitable for a wide range of intermediate players.
A head-heavy balance adds more momentum to your swings, giving stronger smashes and deeper clears. Best for attacking players.
Grip Sizes: G4,G5,G6
Max Tension: 29 lbs
3U (85-89g) gives more weight and stability, allowing stronger smashes and better control for powerful players.
This tension range is ideal for intermediate to advanced players seeking crisp control and strong repulsion.
Grip Sizes: G5,G6
Max Tension: 28 lbs
4U (80-84g) offers faster handling and great maneuverability, ideal for doubles or quick all-round play.
This tension range is ideal for intermediate to advanced players seeking crisp control and strong repulsion.