UltraDrive Bottom Roller, New, Komatsu, 21W-30-00021

SKU: BR417

$291.02
$291.02
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The UltraDrive Bottom Roller, New, Komatsu, 21W-30-00021 is an OEM-specification roller built to fit KOMATSU PC75UD-2 machines. Machined to the precise tolerances required by KOMATSU equipment, this replacement roller restores full undercarriage function -- reducing operating noise, preventing premature track wear, and extending overall machine life.

Ultratrack stocks OEM-grade KOMATSU undercarriage parts verified by make, model, and serial number. Every roller ships free to the contiguous United States with same-day processing and is backed by a 30 Month manufacturers defect warranty.

* Notes: All sizes (variants) displayed with your make and model will fit. | Call us if you have any questions. 866-516-TIRE (8473)

Condition: New
Call or Text 866-516-TIRE (8473)
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The UltraDrive Bottom Roller, New, Komatsu, 21W-30-00021 is an OEM-specification roller built to fit KOMATSU PC75UD-2 machines. Machined to the precise tolerances required by KOMATSU equipment, this replacement roller restores full undercarriage function -- reducing operating noise, preventing premature track wear, and extending overall machine life.

Ultratrack stocks OEM-grade KOMATSU undercarriage parts verified by make, model, and serial number. Every roller ships free to the contiguous United States with same-day processing and is backed by a 30 Month manufacturers defect warranty.

Why Choose This

  • Verified Fitment — Confirmed compatible with your machine. Fits or your money back.
  • Price Match Guarantee — Find a lower price anywhere and we will beat it.
  • Free Shipping — Ships free to all 50 US states from 13+ warehouses.
  • Same-Day Processing — Orders placed before 1 PM CST ship the same business day.
  • 30-Month Warranty — Industry-leading coverage against manufacturing defects.

What Goes Into Every UltraTrack Track

Every UltraTrack rubber track is engineered with a multi-layer construction system designed for maximum service life under real jobsite conditions.

  • Continuous Steel Cord Belt — A single continuously wound steel cable runs the full length of the track, eliminating splice points that cause premature failure. This is the same belting method used in OEM tracks.
  • High-Tensile Steel Links — Drop-forged steel links engage cleanly with your machine's sprocket for smooth power transfer and reduced undercarriage wear.
  • 100% Virgin Rubber Compound — Acid-washed steel cords are bonded through multi-stage vulcanization. No reclaimed or recycled rubber. The result is a track body that resists delamination, cracking, and chunking even under sustained heavy loads.
  • UV and Ozone Stabilizers — Built-in antioxidants and antiozonants protect against sun and weather degradation, extending track life for machines that sit outdoors between jobs.

Track Care: Getting the Most Hours from Your UltraTrack Tracks

  • Tension Check — Check track tension at the start of every shift. Over-tensioned tracks accelerate wear on sprockets and idlers. Under-tensioned tracks risk derailment. Refer to your your machine's operator manual for the correct sag measurement.
  • Clean the Undercarriage — Packed mud, rocks, and debris add weight, increase fuel consumption, and cause uneven wear. Hose out the undercarriage at the end of each day, especially in clay or mud conditions.
  • Inspect Wear Indicators — Look for cracking between lugs, exposed steel cords, uneven lug height, and missing chunks. If the rubber between lugs is worn to less than 1/4 inch, it is time to replace.
  • Rotate Travel Direction — When possible, alternate the direction your machine travels on repetitive routes. This distributes wear more evenly across the track surface.

Product Specifications

SKUBR417
BrandUltraTrack
ConditionNew

Compatible Parts & Alternatives

Frequently Asked Questions

Still have a question?

Have a question about fitment, sizing, or this product? Our team answers 7 days a week.

Call (866) 516-8473

Shipping & Returns

Shipping

Free shipping on every order to all 50 US states. No minimum purchase. Orders placed before 1 PM CST are processed and shipped the same business day from the nearest of our 13+ US warehouse locations.

Returns

30-day hassle-free returns on unused products in original packaging. If the track does not fit your machine due to an error on our part, we cover return shipping.

Warranty Info

30-Month Warranty

All rubber tracks are backed by a 30-Month manufacturer warranty against defects in materials and workmanship. This is the longest warranty in the aftermarket rubber track industry. If something is not right, we make it right.

Verified Customer Reviews

UltraDrive Bottom Roller, New, Komatsu, 21W-30-00021
UltraDrive Bottom Roller, New, Komatsu, 21W-30-00021
$291.02
$291.02

Not sure this is the right part for your machine? Call us at (866) 516-8473 — our team can verify fitment and help you choose the right tread pattern. We are available 7 days a week.

Compatible With All Major Brands

Replacement tracks and tires for Bobcat, CAT, Kubota, Case, Takeuchi, and hundreds more.

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