Li-Ning AxForce 90 New 5U deep dive: the light build that still bites
The 5U AxForce 90 New keeps the 4U shaft hardness and drops the head mass. What that buys in fast doubles, and how it compares with the 3U and 4U builds.
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Overview
Most buying advice for the AxForce 90 New argues about whether it beats the AxForce 80 or the Astrox 88D Pro. For anyone who has already decided on the frame, that is the wrong argument. The decision that actually changes how this racket plays in your hand is which weight class you order, and Li-Ning sells it in three: 3U, 4U and 5U. This page is about the lightest of them. It is not the head-to-head against the 80 and the 88D Pro — that comparison lives on its own URL and covers five frames.
What 5U changes on this frame
The important detail, and the one that makes the 5U worth singling out, is that the shaft does not get softer as the racket gets lighter. Across the line the 90 New uses the same 6.4 mm shaft, and the 5U shares the 4U's shaft hardness. What comes off is head mass, not shaft. That matters because the 90 New's reputation rests almost entirely on its shaft. Li-Ning went up from the 6.2 mm used on the AxForce 90 Long and Tiger, and the result is the most convincing shaft the brand has put in an attack frame: transparent feedback, real elasticity, moderate stiffness, and a burst that arrives when you ask for it. Order the 5U and you keep all of that. You are only giving up head weight. So the 5U is not a watered-down 90 New. It is the same engine with less mass behind the frame.
The rest of the platform, unchanged by weight
Everything structural carries across the weight classes. The bed is 76 holes, up from 72 on the Long and Tiger, with full grooves. The frame is a box-aero hybrid with a high-section wind-cut head, narrower than Li-Ning's older attack frames, and it swings noticeably faster than the shape suggests. Inside the lay-up sits the brand's frame energy-storage damping system — a high-elasticity polymer that stores return energy and filters vibration. Anti-torque is the surprise. A 6.4 mm shaft this thin has no business holding direction under a full swing, and it does: big power produces no wobble, and placement stays where you put it. The sweet spot is also more forgiving than the small head implies, which is unusual and is the single biggest reason the frame suits club players at all. The 4U reference build, with the base cap removed, comes in around 89.5 g at a 304 mm balance. Li-Ning's tension range runs to 31 lb across the line.
5U against the AxForce 80
The natural comparison for a lighter 90 New is not the 4U 90 New — it is the AxForce 80, because that is the racket most people are upgrading from. Two things are true at once here, and skipping either one gives the wrong impression. Against the AxForce 80 Muse, the 5U 90 New is clearly the heavier racket in hand. Against a 4U AxForce 80, it is far easier to swing. Substantial but not sluggish is the honest summary: this is a light build of a serious attack frame, not a speed racket wearing an attack badge. If you came to the 90 New because the 4U AxForce 80 felt like too much racket by the third game, the 5U is the build that fixes that without giving up the shaft you came for.
Which weight class suits which game
The 3U is the demanding one. Entry difficulty is high and it wants a player with the technique and the power to load a firm shaft on every rear-court shot — realistically, singles players who already know they hit hard. The 4U is the default, and it is the build most of the measured data describes. It carries enough head weight to threaten from the back and stays manageable through a long session. The 5U earns its place in fast doubles. This is where head-heavy builds of the 90 New actually struggle: 3U and 4U both get caught out in quick mid-court exchanges, where the racket arrives a fraction late and the rally is already over. Speed-first doubles players are the clearest case for the 5U, and it is also the most accessible build of the three for anyone stepping up from a milder frame. The pattern across the line is consistent — 4U and especially 5U feel approachable, while the 3U does not.
Who should buy the 5U
Buy it if you play mostly doubles, if your losses come from being late in the mid-court rather than from a lack of smash weight, or if you want the 90 New's shaft without the arm cost of its heaviest build. It is also the sensible first 90 New for a club player moving up from an AxForce 80 or a Halbertec 8000 who wants more offence than either offers. Skip it if single-shot smash weight is the reason you are buying. Head mass is exactly what the 5U trades away, and one full smash from a 4U or 3U build will land heavier. Skip it too if you are looking for a first proper racket — the 90 New rewards technique in every weight class, and 5U does not change that.
Verdict
The 5U AxForce 90 New is the build that makes this frame a doubles racket. Same 6.4 mm shaft, same 76-hole bed, same anti-torque and same forgiving sweet spot as the 4U, with the head mass taken out and the mid-court speed handed back. It is not the build for a rear-court bomber, and Li-Ning did not intend it to be. If the 4U feels a beat slow in fast exchanges and you have no interest in giving up the shaft, this is the one to order.
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