When discussing Chinese running brands capable of creating elite-level racing shoes at an accessible price, BMAI (必迈) always turns heads. The JingTan (惊碳) series—globally known as the BMAI Turbo—has long established itself as a go-to weapon for hunting PRs from 10K to 42K, offering an unrivaled price-to-performance ratio.
In its fourth iteration, BMAI JingTan 4 (Turbo 4.0) raises the stakes, positioning itself as a pure-bred racer for runners chasing Sub 3 or Sub 3:30 marathons. More than just an evolution of the 3.0, this version brings a revolutionary lightness, weighing in at a staggering 170g (US Men’s 8 / EU 41). It pairs this weight with the next-gen BoomMAX+ supercritical foam and a full-length TwistCore carbon plate.
After 60km of testing—ranging from grueling track intervals and heart-pumping tempo runs to long-distance weekend efforts on asphalt—I have a clear picture of its explosive strengths and the specific nuances you need to know before buying. Before diving into the on-road feel, let’s look at the core specs.
1. Technical Specifications
- Actual Weight: 170g (US 8 / EU 41) — Blisteringly light for a carbon racer.
- Stack Height: 35.5mm (heel) / 31mm (forefoot).
- Drop: 4.5 mm (promotes a natural, flat landing).
- Midsole: Premium BoomMAX+ supercritical foam (PEBA-based, >85% energy return, highly resilient against compression).
- Plate: Full-length carbon plate with a spoon-shaped, anti-twist TwistCore structure.
- Upper: Ultrathin, breathable, near-translucent Mono Mesh.
- Outsole: DSP/RPU thin-film rubber for high-traction on wet and dry surfaces.
- Category: Carbon Racing Shoe / Speed Trainer.
- Optimal Pace/Distance: 10K • 21K (HM) • 42K (FM).
- Vietnam Retail Price: Approx. 3,000,000 VND.
💡 Tip: Compare these specs against other top contenders using the Shoe Compare Tool on Thích Chạy Bộ.
2. On-Feet Experience
The first thing you notice is the weight. At sub-200g, the shoe feels like a featherweight track spike, yet it features a substantial, responsive midsole.
At an easy pace (6:00/km), the shoe feels firm and aggressive, pushing you to pick up the pace. The low 4.5mm drop encourages a natural midfoot or forefoot strike. If you heel-strike at slower speeds, the streamlined heel can feel slightly unstable.
However, once I hit Tempo (4:30/km) and Interval (3:50/km) paces, the JingTan 4 truly wakes up. The BoomMAX+ foam compresses and snaps back with intense energy. Combined with the rigid, spoon-shaped carbon plate, each stride feels effortless, pushing your momentum forward and helping maintain cadence even under fatigue.
3. Fit
For my 165cm, 57kg frame (US 8), here are my takeaways:
- Toe Box: True to size in length. However, the aerodynamic race-last tapers slightly at the front. If you have wider feet, consider going up half a size (0.5) to avoid toe rubbing on runs over 21km.
- Upper & Lacing: The suede-like tongue is incredibly thin and locks the midfoot down perfectly. The serrated laces hold knots securely—no slippage during speed work.
- Heel Lock: Two targeted foam pods line the Achilles, keeping the heel secure despite the minimal construction.
4. Cushion
The BoomMAX+ foam is a significant leap forward.
- Feel: Unlike the mushy, soft feel of some competitors, BoomMAX+ is firm and resilient. It absorbs 30% of impact but returns it immediately, keeping ground contact time extremely short.
- Durability: I ran 25km in high heat, and the responsiveness remained identical from the first kilometer to the last—a major plus for protecting legs during the late stages of a marathon.
5. Stability
For a lightweight racer, stability is quite good.
- Anti-twist: The TwistCore plate prevents the midsole from deforming during sharp corners.
- Heel Platform: Because the heel is narrowed to save weight, it requires a fairly competent running form. It shines best for midfoot/forefoot strikers. Runners with heavy overpronation or extreme heel-striking habits might find it slightly wobbly if their ankle strength isn’t up to par.
6. Ride
The ride is precise and mechanical. The prominent rocker geometry, combined with the low drop, creates a natural pivot point. It doesn’t offer a soft, cruising sensation; instead, it delivers a snappy, decisive transition that practically catapults you into the next stride.
7. Upper & Outsole
- Upper: The Mono Mesh is class-leading in breathability. It doesn’t soak up water, so the shoe stays light even in rain or through wet patches.
- Outsole: The DSP/RPU rubber acts like suction cups. Traction is excellent on dry pavement and reliable even on slick, rain-soaked roads.
8. Usage & Lifestyle
- Walking: Not recommended. The rigid plate and aggressive rocker make this an uncomfortable choice for standing or casual walking.
- Style: It looks like a high-performance racing machine. Best paired with race singlets and split shorts, not casual streetwear.
9. Who is this for?
- Ideal Pace: 3:30 to 5:15/km. This is the sweet spot where you generate enough force to engage the carbon plate and BoomMAX+ foam.
- Lightweight Runners (<65kg): This is the perfect shoe. You get the maximum benefit of the 170g weight without “bottoming out” the foam.
- Mid-to-Heavy Runners (68kg+): Great for 5K to 21K distances. For a full 42K, ensure your calves and ankles are strong, as the minimal heel structure may require more stabilization over long durations.
10. Value
At roughly 3,000,000 VND, the BMAI JingTan 4 offers a massive performance-per-dollar advantage over big-name competitors costing double the price. It is an incredibly economical investment for any runner serious about smashing their PRs this season.
11. Final Verdict
Final Score: 8.9/10
- Fit: 8.5/10
- Cushion: 8.5/10
- Energy Return: 9.0/10
- Weight: 9.8/10
- Breathability: 9.0/10
- Traction: 8.8/10
- P/P: 9.5/10
