The Megabass BIG-M 4.0 is a groundbreaking magnum crankbait engineered to overcome the crippling reel resistance typical of traditional deep divers. Designed under the guidance of Yuki Ito, this 2-ounce flat-sided titan reaches depths of 4.0 meters (13 feet) with a light, effortless retrieve cadence that allows all-day grinding without angler fatigue.
 
Hydrodynamic Flat-Side Architecture
Unlike traditional, bulky deep-diving crankbaits that act like underwater anchors, the BIG-M 4.0 utilizes a tall, flat-sided body profile paired with a specialized lip angle. This hydro-tuned architecture cuts through the water column effortlessly, delivering an aggressive rolling-and-flashing action that projects massive visual displacement into the depths while keeping reeling resistance remarkably low.
 
Triple-Tungsten Moving Weight System
To hurl a magnum-class crankbait into strong winds and achieve maximum diving depth, casting distance is paramount. The BIG-M 4.0 features a low-center-of-gravity internal weight system loaded with three heavy tungsten spheres. During the cast, the weights lock back to propel the lure like a rocket; upon water entry, they shift forward to instantly lock the lure into a steep, aggressive diving trajectory.
 
Low-Center-of-Gravity Balance
By positioning its primary weight mass extremely low within the frame, the BIG-M 4.0 maintains razor-sharp stability even when retrieved at high speeds or deflected violently off deep structure. When it contacts submerged ledges, rock piles, or deep timber, it immediately recovers its swimming posture without blowing out, provoking vicious reaction strikes from suspended trophy bass.
 
The BIG-M 4.0 Advantage
Magnum 126mm flat-sided profile engineered to reach 4.0m (13ft) depths
Ultra-low winding resistance allows for comfortable, all-day deep cranking
Triple-tungsten weight transfer system maximizes long-range casting distance
High-contrast rolling action delivers intense visual flash and hydro-waves
Low-center-of-gravity design ensures rapid posture recovery off deep cover
Outfitted with heavy-duty JDM hardware built for monster bass
 
Specifications
Length: 126 mm (4.96 in.)
Weight: 2 oz. (≈56 g)
Type: Floating (Magnum Deep Crankbait)
Diving Depth: Max 4.0 m (13 ft)
Category: Hard Baits
Hooks: #1/0 x 2pcs
 
With its unmatched casting distance, effortless retrieve feel, and aggressive flat-sided rolling flash, the Megabass BIG-M 4.0 redefines what is possible in the magnum deep-cranking arena.
 
Browse the BIG-M 7.5 here and the 2.0 version here.