This is a direct aftermarket replacement rubber track for the your equipment, engineered to the exact Unknown Size specifications. Designed for mini excavators, the Fits Bobcat E50 & Kubota KX057-4 tread on this Unknown Size track provides stability during heavy digging and reduces vibration when tracking across hardpack.
This Unknown Size track is verified to fit the following mini excavator tracks models:
To maximize the lifespan of your new Unknown Size track, we recommend inspecting your drive sprockets, bottom rollers, and front idlers prior to installation. Operating a new track on worn sprockets can cause premature wear to the steel links and drive lugs.
Tread Pattern Guide
Compare common TrackTECH rubber track tread patterns by traction, ride comfort, surface protection, and jobsite conditions.
Balanced Jobsite Performance
Best for: general construction, dirt, gravel, clay, and mixed jobsite use.
C-Block tracks are a strong all-around option for compact track loaders working across everyday jobsite conditions. They provide dependable traction, a stable ride, and balanced wear life without being overly aggressive on the ground.
Aggressive Traction
Best for: mud, loose soil, slopes, clay, and soft ground.
Zig-Zag tracks use an alternating lug design to improve bite and help the track clean out in loose or wet conditions. This pattern is a strong choice when traction and hillside control matter more than surface protection.
Severe-Duty Terrain
Best for: forestry, mulching, extreme land clearing, and the most severe off-road environments.
Designed for high-horsepower CTLs in dense brush, jagged terrain, and debris-heavy conditions. The most aggressive TrackTECH tread for severe duty — built for durability, puncture resistance, and relentless traction when clearing heavy brush or earth.
Fortified Core Defense: ultra-reinforced center guide deflects stumps, jagged rocks, and sharp forestry debris from the core. Maximum Bite: deep aggressive lugs deliver uncompromising forward drive from deep clay to heavy snowpack.
Trade-off: overkill on sensitive turf or finished pavement — runs rough and will tear up the ground. Ideal surfaces: mulch/brush, deep clay, jagged rock, snow.
Mini Excavator Control
Best for: mini excavators, trenching, grading, utility work, and mixed surfaces.
Directional tracks are commonly used on mini excavators where forward traction, controlled movement, and dependable wear are important. This pattern helps provide predictable movement across dirt, gravel, clay, and general excavation conditions.
Not sure which tread pattern is right for your machine? Send your make, model, serial number, or a photo of your current track size and TrackTECH will help confirm fitment before your order ships.
Common questions about 400x72.5Wx74 MX Pattern rubber tracks
Tread choice should match the ground you work most: C-Lug/C-Block for hard abrasive surfaces, Zig-Zag for mixed all-terrain use, and Multi-Bar for turf and finished ground. This listing is the MX Pattern option in size 400x72.5Wx74.
Read the size stamp molded into your current track (Width x Pitch x Links, e.g. 400x72.5Wx74). Match that stamp exactly before ordering — do not order by machine nickname alone. Not sure? Call (850) 816-7898 and we will confirm fitment.
This 400x72.5Wx74 TrackTECH rubber track weighs about 755.0 lb per track (from product shipping weight). Plan freight unload help accordingly.
In-stock orders placed before 12 PM CT ship the same business day from our U.S. warehouses. Free shipping to the lower 48 on qualifying track orders. Most deliveries arrive in 1–3 business days via freight. Call (850) 816-7898 if you need a guaranteed ship date.
Inspect sprockets, bottom rollers, and idlers when installing a new track. Hooked or sharp sprocket teeth and flat-spotted rollers will chew a new belt early. Pairing fresh undercarriage parts with a new 400x72.5Wx74 track is the best way to protect your investment — use Track Finder or call (850) 816-7898 with your machine make and model for matching parts.
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