This rubber track sizing guide covers the three numbers in any track code: width, pitch, and link count, written as 300×52.5N×86. Width is the outer rubber width in millimetres. Pitch is the distance between pin centres. Link count is the number of links around the track. Measure all three correctly, then confirm them against the machine's OEM part number before ordering. This guide covers measurement; for matching the track to your machine and confirming fitment, see our rubber track fitment guide.
Related reading: fitment and ordering details are covered in the Fitment Guide (RT09), and replacement timing in the Wear Indicators article (RT06) — this article focuses on sizing and measurement.
Bottom line: measure width, pitch, and link count on the current track, then confirm the code against your machine's serial number and OEM part number before ordering.
Before Ordering Checklist
- Supplier: AFT Parts — aftermarket excavator and loader undercarriage components.
- Scope: Track size code — width, pitch, link count, profile
- Compatible with: CAT, Komatsu, Kubota, Bobcat, Hitachi, John Deere, and more.
- Verification: size code and machine serial confirmed before dispatch.
- Warranty: 12-month pro-rated limited warranty on covered components.
- Application coverage: Ontario contractors, rental fleets, municipal operators
How this guide was verified: Fitment and sizing claims are cross-checked against AFT Parts fitment records and OEM part-number references; ground-pressure references follow ISO 16754:2008. Specifications are planning figures, not guarantees for a specific machine.
A rubber track size code contains four elements — width, pitch, link count, and a profile letter — and all four must match the machine.
What Do the Numbers on a Rubber Track Label Mean?
A rubber track code carries four pieces of information. Width is the outer rubber width in millimetres. Pitch is the distance between two adjacent pin centres. Link count is the number of links around the track. A letter such as N, W, or T identifies a profile or tread variant within that nominal size. Every figure must match the machine it is fitted to.
For Ontario operators, the label is the fastest diagnostic tool on a jobsite. When a rental fleet hands back a compact excavator with a worn track, the first thing a shop writes down is the complete code, not just the width. A track listed as 300×52.5N×86 has a specific sprocket engagement, and a machine that needs the N profile will not run correctly on a different profile with the same numbers. The letter matters as much as the digits, and treating the whole code as one unit prevents most ordering mistakes.
How to Measure Track Width Correctly
Clean the tread and sidewalls, lay the track flat, and measure from one outside rubber edge to the other at several points, recording the consistent value in millimetres. Do not measure the steel core, the machine frame, or a printed label alone. Debris and bent sidewalls hide the true width.
Width mistakes are common in Ontario's mixed construction market because machines move between sites with different conditions. A contractor in the GTA running the same compact excavator on poured pads in summer and soft backfill in spring may be tempted to order a wider track from memory. Measuring the actual belt takes five minutes and removes the guesswork. A dirty or folded track can read several millimetres off, so clean the surface first and take more than one reading. If the track is still mounted, the sidewall code is a useful cross-check, but a physical measurement after removal is the reference standard AFT Parts uses when confirming fitment.
Pro tip: measure at three points along the track and use the consistent value. If two readings agree and one does not, remeasure the outlier before recording it.
Finding Pitch and Link Count Accurately
Measure ten pin centres from centre to centre and divide by ten to get the pitch. Count the pin centres along one side to get the link count, or divide total track length by pitch. Common compact-machine pitches range from roughly 48 mm to 72.5 mm.
Pitch is the dimension that most often gets misread, because a single-link measurement magnifies tape error. Across ten links, a mistake in reading is divided by ten and becomes obvious. Link count follows the same logic: a stretched or worn track can grow slightly, so when the printed code and the physical count disagree, the physical count wins and should be confirmed with the supplier. For an Ontario shop servicing multiple brands, keeping a simple log of each machine's pitch and link count alongside its serial number turns every future reorder into a two-minute job instead of a remeasurement.
Why Does Pitch Matching Matter for Your Undercarriage?
Pitch determines how the track engages the drive sprocket. A mismatched pitch causes slipping, rapid tooth wear, vibration, and track throwing under load. Correct pitch keeps the lugs and sprocket teeth meshing smoothly, which protects the whole undercarriage system.
In Ontario's freeze-thaw seasons, machines run on pavement, gravel, mud, and snow in the same week. A track with the wrong pitch slips most when it matters: climbing a frost-heaved ramp or turning on wet clay. The damage does not stop at the track. Sprocket teeth wear faster, rollers and idlers take shock loads they were never designed for, and what started as a "close enough" track becomes a full undercarriage repair. AFT Parts engineers check pitch against the sprocket specification before a single set ships, because an engaged track is a track that protects every other component behind it.
Metric vs Imperial Sizing: A Common Source of Errors
Most rubber tracks are sized in millimetres, while some machine documentation still uses inches. Twelve inches equals 304.8 mm, not 300 mm. Rounded metric sizes do not interchange with imperial sizes, so always confirm which unit your machine spec uses before comparing.
This confusion costs Ontario operators real money. A used machine imported from the United States may arrive with imperial documentation, while a Canadian parts listing shows metric sizes. Someone ordering a "12-inch" track when the machine needs 300 mm ends up with a belt that is nearly 5 mm off in width and a different pitch family altogether. The table below shows the conversion errors that cause most returns.
| Nominal imperial size | True metric equivalent | Common metric label | Interchangeable? |
|---|---|---|---|
| 10 inches | 254.0 mm | 250 mm | No — 4 mm narrower |
| 12 inches | 304.8 mm | 300 mm | No — 4.8 mm narrower |
| 16 inches | 406.4 mm | 400 mm | No — 6.4 mm narrower |
The fix is simple: write the machine's spec in one unit, convert nothing from memory, and keep the OEM part number as the anchor. Every AFT Parts listing is cross-referenced by OEM number precisely so that unit confusion never reaches the checkout.
Which Rubber Track Sizes Fit Common Ontario Machines?
The table below shows typical size families and where they are commonly deployed across Ontario. The size codes are illustrative examples, not a universal fit list, and the table is a starting reference — not a substitute for model- and serial-number verification.
| Machine class | Typical size code | Common Ontario use |
|---|---|---|
| Small mini excavators (1.5–3 t) | 230×48×64, 230×96×33 | Residential foundations, cottage-country septic work, landscaping |
| Compact excavators (3–5 t) | 300×52.5N×80, ×86, ×88 | GTA utility work, curb and sidewalk jobs, rental fleets |
| Compact track loaders | 400×72.5W×72, 450×100T×48/50 | Snow removal, site cleanup, municipal maintenance |
Ontario's jobs are unusually varied: soft cottage-country ground in Muskoka, abrasive crushed stone around the GTA, and municipal lots plowed all winter. The same machine class can justify different widths and profiles depending on the territory. Rental companies in Hamilton and Ottawa standardize on mid-range sizes so one spare set covers multiple machines, while municipal operators in northern Ontario lean toward wider, self-cleaning tracks for snow season. AFT Parts supplies compatible track systems for CAT, Komatsu, and Kubota machines across these classes, and the sizing logic is identical: match the code, confirm the model, then order.
Confirming Fit Before You Order
Gather the machine brand, model, and serial number, the full size code from the current track, and the OEM part number if available. Send all three to your supplier and wait for fitment confirmation before ordering. This single step eliminates almost every wrong-track return.
An Ontario contractor ordering replacement tracks for a Kubota compact excavator should be able to give the shop the serial number, the worn track's code, and the original part number in one message. With those three facts, the supplier verifies pitch, link count, and profile against the machine instead of relying on a nameplate model alone, because the same model can ship with different undercarriage configurations. AFT Parts confirms every fitment before dispatch and backs each track with a 12-month pro-rated limited warranty, so the risk is on the supplier, not on the operator who measured correctly and still got a mismatched belt.
Reliable Fitment Support for Ontario Operators
Look for a supplier that confirms fitment before shipping, stocks common Ontario sizes, responds with delivery windows rather than vague estimates, and stands behind the part with a written warranty. That combination is what separates a parts order from a parts relationship.
AFT Parts supports Ontario contractors, rental companies, repair centres, and municipal fleets with fitment checks confirmed before dispatch from Canadian hubs. When a machine is down on a Toronto site, the question is not just whether the track is in stock, but whether it has been verified against the serial number before it leaves the warehouse. AFT Parts checks every order against the machine details provided, and the support team answers sizing questions from Ontario operators directly. Between the 30-day return window and the 12-month pro-rated warranty, an Ontario shop can order with confidence that a measurement mistake on either side will be caught before it becomes downtime.
AFT Parts Expert Views
"In our work, sizing is treated as a safety issue, not a sales question. Across the fitment records we review, the number one cause of premature sprocket and roller wear is a track that was 'almost' the right pitch. Operators assume the label is correct because the machine ran, but a worn or stretched track changes the geometry. That is why we ask for the serial number and the OEM part number, not just the model. In an Ontario winter, a track that slips on a frost-heaved ramp is a liability. When every component is matched to the machine, the track, rollers, idlers, and sprockets wear together at predictable rates, and the operator gets the cost per hour they planned for. Measure clean, measure twice, and confirm before you commit." — AFT Parts Technical Team
Conclusion
Rubber track sizing is three numbers plus one letter: width, pitch, link count, and profile. Measure width on the clean rubber, calculate pitch across ten links, count the links physically, and treat the whole code as one unit. A correctly sized track protects the sprocket, rollers, and idlers behind it, and a fitment-checked order protects your schedule.
Key Takeaways for Canadian Operators
- Record width, pitch, link count, and the profile letter from the current track before removing it.
- Measure width on clean, flat rubber; calculate pitch across ten links; count links physically.
- Keep the machine serial number and OEM part number with the size code in one file.
- Confirm units before comparing metric and imperial sizes — 12 inches is not 300 mm.
- Order only after a supplier confirms fitment; a written warranty protects the purchase.
Questions to Ask Before You Order
- What is the exact size code, including the profile letter, for my machine model and serial?
- Does the supplier cross-reference the OEM part number before dispatch?
- Which approved widths and pitch options apply to my undercarriage configuration?
- What delivery window applies to my Ontario location, and what happens if the size is wrong?
- How is the 12-month pro-rated warranty documented, and what does it exclude?
Discuss your machine details with AFT Parts for a fitment check, and ask for confirmation in writing before you order. Compare available sizes in the Rubber Track collection and the 300×52.5N track family before ordering.
Frequently Asked Questions
What do the three numbers on a rubber track mean?
The three numbers are width, pitch, and link count. Width is the outer rubber width in millimetres, pitch is the distance between pin centres, and link count is the number of links around the track. A letter in the code identifies the profile variant.
Is 12 inches the same as 300 mm?
No. Twelve inches is 304.8 mm. Rounded metric sizes and imperial sizes are not interchangeable, so always confirm which unit your machine specification uses and cross-check with the OEM part number.
Can I measure pitch with a tape measure?
Yes. Measure ten pin centres from centre to centre and divide by ten. Measuring a single link magnifies tape error. Compare the result with the printed code and confirm the physical count with your supplier.
What if my track label is worn off?
Measure the outer rubber width directly, measure pitch across ten links, count the links, and contact AFT Parts with your machine serial number. The fitment team can cross-reference the measurements against known machine configurations.
How long does it take to confirm fitment for an Ontario order?
Fitment confirmation is completed before dispatch, and delivery windows depend on stock and location. Providing the serial number, size code, and OEM part number up front is the fastest way to move an order through confirmation.