If you are replacing tracks on a Bobcat T66, the first decision is not tread pattern or price. It is confirming the exact track configuration that is already on the machine. The T66 is cataloged with two width configurations that share the same 86 mm pitch and 50-link count.
Bobcat T66 rubber track size
TrackTECH's current live catalog lists the following fitment options for this machine:
- 320x86x50
- 400x86x50
320 mm vs. 400 mm on the T66
Both sizes exist in the live catalog, but width is a fitment variable, not a styling choice. Verify the installed belt and undercarriage before moving from 320 mm to 400 mm or the other way around.
Do not change width, pitch or link count just because another size looks close. Alternative sizes in the catalog are machine/undercarriage-specific. Read the molded size on the old track and confirm the machine configuration before changing dimensions.
What tread should you buy?
Once fitment is confirmed, choose tread for the surface where the machine earns most of its hours. A more aggressive tread is not automatically a better track; the wrong pattern can trade ride quality and hard-surface wear for traction you do not need.
| Primary work | Tread direction |
|---|---|
| Concrete, asphalt, hard pack | C-Block or block-style tread for stability and wear |
| Mixed dirt, gravel, general contracting | Zig-Zag, Staggered Block or All-Terrain |
| Mud, snow, soft ground | Multi-Bar or a more open/aggressive tread |
| Steep, loose or severe terrain | X-Terrain / aggressive traction pattern where available |
See the C-Block vs. Zig-Zag vs. Multi-Bar guide for a more detailed comparison.
Buying tracks for a used T66
If you recently bought this machine used, inspect the undercarriage before installing new rubber. Hooked sprocket teeth, seized or loose rollers, damaged idlers and a weak tensioner can shorten the life of a new track quickly. New tracks do not fix worn undercarriage parts.
- Check both tracks for the same molded size.
- Inspect sprocket teeth for hooking or sharp, uneven wear.
- Spin and inspect rollers and idlers for play, leakage or flat spots.
- Confirm the tensioner can move through its normal range.
- Compare left-to-right wear before deciding whether to replace one track or the pair.
How to verify fitment before ordering
- Confirm the exact make and model.
- Read the full size from the existing track: width × pitch × links.
- Check any guide-family or undercarriage-specific markings.
- If the machine has more than one cataloged option, verify the installed configuration rather than selecting by preference.
- If the marking is missing, use the Rubber Track Finder or send TrackTECH the machine details for verification.
Shop Bobcat T66 tracks and parts
See the live Bobcat T66 Tracks & Parts collection for currently cataloged tracks and related undercarriage components.
Frequently asked questions
Can I change to a wider track?
Only when that width is verified for the machine's actual undercarriage configuration. Matching pitch and link count alone is not enough.
Should I replace both tracks?
If both are similarly worn, replacing them as a pair is usually the better mechanical choice. A nearly new matching track on the other side can be a reasonable exception after condition and effective circumference are checked.
Should I replace sprockets with the tracks?
Not automatically, but badly worn or hooked sprockets should not be left in service just because they still move the machine. Worn teeth can damage new drive lugs and accelerate wear.
Quick Buying Answers
Which rubber track rides the smoothest? For a verified fitment that offers it, Multi-Bar is usually the first tread to compare when lower vibration and smoother travel matter most.
Which track lasts longest on pavement? On asphalt and other hard, relatively flat surfaces, Multi-Bar is a strong first choice because it spreads contact across more tread bars. For harsher abrasive work such as broken concrete, rock, or demolition debris, compare a heavier C-Block or Staggered Block pattern instead.
What is the best track for paving? Start with Multi-Bar when ride quality, steady contact, and hard-surface travel are priorities. Confirm that the exact pattern is available for your machine before ordering.
What is the most affordable track? Price depends on the exact width, pitch, link count, guide type, and tread. Once fitment is confirmed, compare the live compatible options rather than changing dimensions just to save money.
What about mud, snow, or soft ground? Zig-Zag is usually the better pattern to compare when cleanout and bite matter more than pavement manners.