D-K-M-N-T Wheel Contour Codes

Features a sharply sloped interior profile plunging into a narrow, angular central well. Rim space near the hub is highly constricted.

Requires specific vintage or low-profile cast-iron weights. Standard blocky weight profiles will strike the inner taper before sitting flush against the mounting holes.

Typically utilizes a specialized 2-hole layout or a tight 4-hole pattern on a smaller Bolt Circle Diameter (BCD). Often relies on traditional hex bolts due to lack of square countersinks.

Employs a standard 5° steep taper dipping quickly into a sharp drop-center well structure near the wheel face.

Common on compact utility machinery. Weights must have a stepped rear protrusion to nest securely inside the specific drop-center recess without putting stress on the bolt flange.

Features standard square knockout holes to anchor carriage bolts, preventing bolt rotation during assembly. Most common setups use a 2-bolt or 4-bolt cross pattern alignment.

Engineered with a shallow drop well, leaving a flat, predictable wide-profile surface area across the wheel interior.

Highly versatile for generic weight mounting. Fits standard mid-sized utility tractor ballast weights seamlessly, providing excellent surface-to-surface contact.

Universally compatible with standard 3-hole triangular mounting patterns or 6-hole configurations (where only 3 alternate holes are populated). Designed for heavy 5/8" or 3/4" grade-5 carriage hardware.

Characterized by a specialized, asymmetrical stepped interior rim well configuration.

Typical of narrow row-crop machinery. Weights must match the specific stepped design to avoid rubbing against the structural "steps" of the steel dish.

Utilizes multi-hole options, typically a 4-hole or 8-hole pattern to distribute the leverage forces generated by tall, narrow wheels. Requires precise BCD alignment from hole center to hole center.

Heavy, thick-plated welded steel structures featuring extra-deep recessed center wells built for high-horsepower limits.

Built for massive, heavy-ballast stackable configurations (often 300 lbs to 1,000 lbs per wheel). Weights require extended hub bell profiles to bolt flush deep inside the heavy rim pocket.

Engineered for high-strength, full-penetration heavy 4-hole or multi-stud mounting layouts. Features reinforced, thick-walled square or round holes meant to secure heavy-duty threaded alignment studs to accommodate multi-layered starter and extension weight blocks.