Last updated: August 2026 · Specs verified against Yonex’s 2026 badminton catalogue · Badminton House
Quick answer
The Astrox 100ZZ is Yonex’s made-in-Japan attacking flagship: head-heavy, extra stiff, 10 mm longer. It targets advanced attacking play; a developing player should compare less stiff alternatives. Buy 4U unless you are a rear-court singles specialist. Treat the article’s 24–27 lb setups as examples to trial within the model’s published range, not a universal starting prescription.
4U · 83 g
Buy this one. Faster swing, quicker recovery, less arm load. Right for doubles, mixed, and anyone who plays both formats.
3U · 88 g
Only if you win points from the rear court in singles and want maximum momentum behind the smash.
Skip it
If you are often late to the shuttle, the extra-stiff shaft gives you nothing back. Compare the handling of an Astrox 88D Pro or a suitable Nanoflare; equipment alone does not determine improvement.
Pros
- Outstanding steep smash from the rear court
- Very solid, dense impact feel — no vagueness
- Faster through the air than most head-heavy rackets
- Made in Japan build quality and finish
- Holds a high tension (up to 29 lbs on 3U)
Cons
- Punishing off-centre — mistimed shots die
- Extra-stiff shaft returns nothing to a slow swing
- Tiring in long defensive rallies, especially 3U
- Flagship price for a racket many players cannot use
- Dark Navy is absent from the cited 2026 catalogue; check current availability
In this review
Yonex Astrox 100ZZ: Verified Specs
Every figure below is taken from Yonex’s own 2026 badminton catalogue and regional product pages. Where a number is commonly quoted online but Yonex does not actually publish it, we say so — that distinction matters more than it sounds, because two of the most-repeated Astrox 100ZZ “specs” are not Yonex figures at all.
| Spec | Astrox 100ZZ | What it means on court |
|---|---|---|
| Weight | 3U avg. 88 g 4U avg. 83 g |
Yonex publishes an average, not a range. The familiar “3U = 85–89.9 g” bands are a retailer convention. |
| Grip sizes | 3U: G4, G5, G6 4U: G5, G6 |
Higher number = thinner grip. Regional stock is narrower than the catalogue — most markets only carry G5. |
| Shaft flex | Extra Stiff | The single most important spec here. A stiff shaft only returns energy if you can load it. |
| Balance | Head Heavy | Yonex publishes the classification only, never a millimetre figure. Retailers measure roughly 300 mm on 4U. |
| Stringing advice | 4U: 20–28 lbs 3U: 21–29 lbs |
The 3U is rated exactly 1 lb higher. Most articles quote a single range for both and get this wrong. |
| String pattern | 22 × 21 | Dense pattern: crisp, precise, less forgiving than an open pattern. |
| Length | 10 mm longer | Extra reach and leverage, and one more reason timing has to be right. |
| Frame / shaft material | Frame: HM Graphite, Namd, Tungsten, Black Micro Core, NANOMETRIC Shaft: HM Graphite, Namd |
Black Micro Core in the upper frame is the ZZ-specific part — it is what makes the hit feel dense. |
| Joint | New Built-in T-joint | Standard for the flagship tier; contributes to the solid, non-flexing feel at contact. |
| Made in | Japan | The Tour and Game versions of the same platform are made in Taiwan. This is a real tier difference, not marketing. |
| Current colourway | Kurenai (red) | Dark Navy was the 2020 launch colour and is discontinued. Same racket, so buy either on price. |
Two numbers to stop repeating. The “6.2 mm” shaft diameter is a retailer measurement — Yonex only ever calls it the Hyper Slim Shaft and publishes no millimetre figure. And the balance point in millimetres is not a Yonex spec either; the company classifies the racket as head-heavy and stops there. Both numbers are useful, but they are not from Yonex.
Full official specifications are published on the Yonex USA Astrox 100ZZ product page and in the Yonex 2026 badminton catalogue.
How the Astrox 100ZZ Plays, Shot by Shot
A racket this specialised is easier to understand shot by shot than as an overall score. The pattern below follows directly from the three specs that define it: head-heavy, extra stiff, and 10 mm longer.
| Shot | What the 100ZZ gives you | What it asks of you |
|---|---|---|
| Smash | Its best shot by a distance. Head mass plus the longer frame produces a genuinely steep, heavy smash. | A full swing with the shuttle in front of you. Reach for it late and the power vanishes. |
| Clear | Effortless length once your technique is sound — the mass does the work. | Nothing is donated. If you rely on shaft flex for length, you will be short all evening. |
| Drop and slice | Excellent. The dense 22 × 21 bed and solid frame give precise, repeatable placement. | Clean contact. The sweet spot is real but small. |
| Net play | Better than expected for a head-heavy frame, thanks to the slim shaft. | Early racket preparation. It is still not a speed racket. |
| Flat drives | Competent in 4U. Noticeably slower to reset in 3U. | Strength and a compact swing. This is where the weight choice shows up most. |
| Defence | The weakest area. Head mass works against you when you are pushed back. | Good footwork so you are defending less often. This is why 4U is the default recommendation. |
The honest summary: the 100ZZ raises your ceiling and lowers your floor. Your best shots get better; your worst rallies get worse. Whether that is a good trade depends entirely on how often you are in control of the rally.
3U vs 4U: Which Astrox 100ZZ Weight Should You Choose?
Yonex lists the 100ZZ at an average of 88 g in 3U and 83 g in 4U. Five grams sounds trivial. On a head-heavy, extra-stiff frame it is not, because total weight and its distribution both affect handling; Yonex does not publish where the 5 g difference sits.
| 3U (avg. 88 g) | 4U (avg. 83 g) | |
|---|---|---|
| Smash | Heavier, more momentum behind the shuttle | Still excellent, marginally less weight of shot |
| Speed and recovery | Slower to reset between shots | Noticeably quicker — the main reason to pick it |
| Arm load over 3 games | High. Technique degrades first, then the racket punishes it | Manageable for most competitive club players |
| Max tension | 29 lbs | 28 lbs |
| Best for | Rear-court singles players and hard hitters | Doubles, mixed, and anyone playing both formats |
Choose 4U if you are unsure. It keeps everything that makes the 100ZZ worth owning — the smash, the solid feel, the precision — and removes the part most players cannot sustain, which is holding technique together in the third game.
Choose 3U only if you already know you want it. The test is simple: if your best shots come when you have time to set up behind the shuttle, 3U rewards you. If your hardest points are flat exchanges, body defence, and late blocks, 3U will cost you more than it gives.
For the weight categories in general, see our 3U vs 4U vs 5U racket weight guide.
Best Strings for the Astrox 100ZZ, and What Tension to Use
String choice matters more on this racket than on almost anything else you could buy. The frame is already stiff, already head-heavy, and already unforgiving; the stringbed is the one part of the setup you can still tune. Get it wrong and you own a very expensive racket that feels harsh and short.
Yonex publishes its own two recommendations for the Astrox 100ZZ: Aerobite Boost for control players and BG66 Force for hard hitters. Both are sensible. Here is how they and the other common choices actually behave in this frame.
| String | Gauge | Suggested tension | Why it works here |
|---|---|---|---|
|
Aerobite Boost Yonex’s pick for control |
Hybrid 0.72 / 0.61 mm |
24–26 lbs | The textured main gives real bite on slices and stick smashes. Best match if you win points by placement rather than raw power. Wears faster than a round string. |
|
BG66 Force Yonex’s pick for hard hitters |
0.65 mm | 25–27 lbs | Thin, fast, explosive off the stringbed. The natural partner to the frame’s attacking character. Expect to restring often — that is the cost of the gauge. |
| Exbolt 63 | 0.63 mm | 25–27 lbs | Similar repulsion to BG66 Force with better durability for the gauge. A good default if you break strings quickly. |
| BG65 / BG65 Ti | 0.70 mm | 24–25 lbs | The durable, forgiving option. Blunts some of the racket’s crispness, which is exactly what some players want while they adapt to it. |
| BG80 Power | 0.68 mm | 25–27 lbs | Extra repulsion in the mid-gauge. Suits rear-court singles players in 3U who want maximum weight of smash. |
What tension should you actually use?
Yonex’s official stringing advice is 20–28 lbs for 4U and 21–29 lbs for 3U. That is the safe range for the frame, not a recommendation to go to the top of it. Yonex also states plainly that stringing above the recommended tension risks frame breakage.
The following 24–27 lb examples are editorial trial setups, not a range established for every competitive club player:
24 lbs
More repulsion and a friendlier hitting window. Right if you are moving up from a more forgiving racket, or if you found the 100ZZ harsh on your first hit.
25–26 lbs
Start here. Enough control to match the frame’s precision without demanding perfect timing on every rally. This is the default for most people buying this racket.
27 lbs
Only if you already hit the sweet spot consistently and can still get depth when you are tired. A higher number is not an automatic improvement in precision.
The mistake worth naming: copying a professional’s tension. Top players string far above the club range because they generate racket-head speed most players cannot, and because they restring constantly. On an extra-stiff frame, too much tension does not make you more accurate — it removes the margin that keeps you accurate when you are late.
If you are new to tension as a variable, our badminton string tension guide covers the trade-offs, and our string selection guide explains gauge and material.
Not sure what to string it at? Tell us your level, main event, and current setup through our stringing service and we will give you a starting tension rather than a sales pitch.
ZZ, VA, Kurenai, Tour, Game, ZX: What Is Actually Different
This is the most confusing part of the Astrox 100 range, and most of the confusion is avoidable once you know which names are colours and which are genuinely different rackets. There are only three categories.
| Name | Same racket as the ZZ? | What is actually different |
|---|---|---|
| Kurenai | Yes — identical | A red colourway. Same item code, same specs. The only 100ZZ colour in the 2026 catalogue. |
| Dark Navy | Yes — identical | The 2020 launch colour, now discontinued. If you find one at a discount, it is the same racket. |
|
Astrox 100ZZ VA Viktor Axelsen Collection |
Effectively yes | Separate item code, but identical flex, frame, shaft, joint, length, weights, grips and tension range — and also made in Japan. The differences are the colour and a higher price. The published specification comparison does not establish identical feel for every individual racket. |
| Astrox 100 Tour | No | Different racket on the same platform. Still Extra Stiff, but Nanomesh Neo replaces Black Micro Core in the frame, it uses the Extra Slim / REXIS shaft instead of the solid-core Hyper Slim, a standard T-joint, and it is made in Taiwan. Same weights and tension advice, noticeably cheaper. |
| Astrox 100 Game | No | Medium flex, not extra stiff — the single biggest difference in the whole family, and the reason it suits a completely different player. Nanomesh Neo frame and shaft, Slim Shaft, made in Taiwan. |
| Astrox 100ZX | No — and discontinued | A separate racket, not a colourway, and absent from the 2026 catalogue. Hollow Extra Slim / REXIS shaft rather than the ZZ’s solid-core shaft, Nanomesh Neo instead of Black Micro Core, made in Taiwan. Sources disagree on its flex rating, so treat any figure you see with caution. |
The practical version: Kurenai, Dark Navy and VA are the same racket. Tour and Game are cheaper rackets that look similar, and only Game changes the flex enough to suit a genuinely different player. The ZX is discontinued and should not be part of a 2026 buying decision.
Colourway lists and country of manufacture are published on the Yonex Far East Astrox 100ZZ page.
Astrox 100ZZ vs the Rackets People Cross-Shop It Against
| Versus | The real difference | Pick the other one if… |
|---|---|---|
| Astrox 88D Pro | Also a head-heavy attacking racket, but built for the doubles rear court rather than singles. More forgiving, easier to swing repeatedly. | You play mostly doubles at the back, or you want most of the attack with far less punishment. This is the most common right answer. |
| Nanoflare 800 / 1000Z | Opposite philosophy. Head-light and speed-first: the Nanoflare wins the exchange before the smash, the Astrox wins it with the smash. | Your points come from flat speed, interceptions and defence rather than from finishing off a lift. |
| Astrox 100 Tour | The same attacking idea at a lower tier — Taiwan-made, different frame material and shaft, meaningfully cheaper. | You want the 100 character and would rather put the price difference into strings, shoes, or coaching. |
| Astrox 100 Game | Medium flex instead of extra stiff. A different racket for a different player, despite the shared name. | You are still building technique. A medium shaft will help you where an extra-stiff shaft simply will not. |
For the speed-versus-power decision specifically, we have a dedicated Nanoflare 800 vs Astrox 100ZZ comparison. For the doubles-attack alternative, see Astrox 88D vs 88S. If you are choosing between Yonex’s three racket families in general, start with our Astrox vs Arcsaber vs Nanoflare guide.
What the Technology Names Actually Do
Yonex prints nine technology names on this racket. Three of them change how it plays; the rest are shared across the range. Here is the honest split, with Yonex’s published figures where they exist.
| Technology | Does it change how the racket plays? |
|---|---|
| Hyper Slim Shaft | Yes. Yonex fills a traditionally hollow shaft with graphite in the core, and states an 11.8% reduction in air resistance. This is why a head-heavy racket still feels quick through the air. Retailers list the diameter as 6.2 mm; Yonex does not publish a figure. |
| Black Micro Core | Yes, and it is ZZ-specific. A dense, stiff vibration-damping material in the upper frame, used here for the first time in a Yonex badminton racket. Yonex states +4% rigidity and +2% vibration absorption. It is what makes the hit feel dense rather than harsh. |
| ISOMETRIC head | Yes, modestly. The Astrox 100 frame is squared off further than a standard ISOMETRIC head, which Yonex says increases the sweet spot by 2.9%. Note the baseline: that is 2.9% against Yonex’s previous ISOMETRIC frame, not against a round frame. It does not make the racket forgiving. |
| Namd graphite | Shaft material designed to flex and snap back. Real, but you only feel it if your swing is fast enough to load an extra-stiff shaft in the first place. |
| Rotational Generator System, Aero+ Box Frame, Energy Boost Cap Plus, Tungsten, Nanometric | Standard across much of the Yonex range. They contribute to weight distribution, frame stability and handle feel, but none of them is a reason to choose this racket over another Yonex flagship. |
Yonex’s own figures for the ASTROX 100 frame are published in its article ASTROX 100: The Next Level of Power and Versatility.
If the shaft stiffness question is the one you are stuck on, our stiff vs flexible shaft guide is the better starting point than any spec sheet. For head shape, see ISOMETRIC vs conventional heads, and for balance, head-heavy vs head-light.
Who Should Buy the Astrox 100ZZ — and Who Should Not
Buy it if
- You take most overheads in front of your body, on balance
- You win points from the rear court
- You already play comfortably with a stiff-shaft racket
- You can finish three hard games without your technique falling apart
- You want an extra-stiff attacking setup and accept the trade-offs
Do not buy it if
- You are a beginner or improving intermediate
- Your clears are sometimes short
- You have had shoulder, elbow or wrist trouble
- You play mostly social doubles and defend a lot
- You are buying it because a professional used one
The last point deserves saying directly, because it is the most common reason people buy this racket and regret it. An extra-stiff shaft does not add power — it returns the power you put in, and it returns nothing if you do not put much in. A player with a developing swing may prefer a medium-flex response; compare comfort and contact quality rather than expecting guaranteed improvement. The 100ZZ is a reward for technique you already have, not a shortcut to technique you want.
Common Questions
Is the Astrox 100ZZ good for beginners?
No. The extra-stiff shaft returns energy only to a fast, well-timed swing, and the dense 22 × 21 stringbed punishes off-centre contact. Beginners should compare it with less stiff rackets before committing; neither price nor flex guarantees a result.
What is the maximum tension for the Astrox 100ZZ?
Yonex’s official stringing advice is 20–28 lbs for the 4U and 21–29 lbs for the 3U. The 3U is rated one pound higher. Yonex warns that going above the recommended range risks breaking the frame, and most club players are better served at 24–27 lbs.
What is the balance point of the Astrox 100ZZ?
Yonex classifies it as head-heavy but does not publish a millimetre figure for any of its badminton rackets. Retailers who measure their own stock typically report around 300 mm for the 4U. Treat any exact number you see as a retailer measurement, not a manufacturer spec.
Is the Astrox 100ZZ VA different from the standard 100ZZ?
Not in any way that affects play. The Viktor Axelsen edition has its own item code and colour, but the flex, frame and shaft materials, joint, length, weight options, grip sizes, tension range and Japanese manufacture are all the same. Compare the current price and included services; the published core specifications match.
Should I buy 3U or 4U?
4U for most people. It keeps the smash and the solid feel while being significantly easier to recover with and less tiring across three games. Choose 3U only if you are a rear-court singles specialist who wants maximum momentum.
Is the Astrox 100ZZ better than the Astrox 88D Pro?
They are built for different jobs. The 100ZZ is the sharper singles and rear-court attacking racket; the 88D Pro is the more usable doubles attacking racket and is more forgiving. For most club doubles players, the 88D Pro is the better buy.
Which colour should I buy?
Whichever is cheaper. Kurenai is the current colour and Dark Navy is the discontinued 2020 launch colour, but they are the same racket with the same specs.
Is the Astrox 100ZZ still worth buying in 2026?
Yes, if it suits you. It launched in 2020 and remains in Yonex’s current catalogue, still made in Japan, and nothing in the range has replaced what it does. The question was never whether the racket is good — it is whether you are the player it was built for.
Which Should You Choose?
| Choose | If this is you | String it at |
|---|---|---|
| 100ZZ 4U | Advanced player, plays doubles and singles, wants the attack without the third-game fade. The default answer. | BG66 Force or Aerobite Boost, 25–26 lbs |
| 100ZZ 3U | Rear-court singles specialist or hard hitter who has the strength and footwork to keep setting up early. | BG80 Power or BG66 Force, 26–27 lbs |
| Astrox 88D Pro | Doubles rear-court attacker who wants most of the power with far more forgiveness. | 24–26 lbs |
| Astrox 100 Game | You like the 100 idea but your technique is still developing. Medium flex will actually help you. | 23–25 lbs |
| Wait | Your clears are inconsistent, or you are recovering from an arm injury. Spend the money on coaching and shoes first. | — |
Availability on the 100ZZ is inconsistent worldwide, and the discontinued Dark Navy turns up at a discount often enough to be worth watching for. If you are shopping in Canada, you can check current Astrox 100ZZ availability, browse the Yonex Astrox series, or browse our badminton rackets collection. Buying from outside Canada, remember to price in exchange, duty and brokerage before comparing against a local total.
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Still deciding between 3U and 4U, or between the 100ZZ and something more forgiving? We play badminton ourselves — tell us your level, main event, current racket, and what feels missing, and we will give you a straight answer through our contact page.
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