Two parts have to match your machine. The other eight do not.
Ten parts make up one unit and four units make a set. Of the ten, two are chosen for your specific quad and the remaining eight come with the system whatever it is bolted to. The hub mounting face (1) has to match your wheel bolt pattern, and the anti-rotation attachment (8) has to match your rear suspension — independent or rigid axle, which is a different question from bolt pattern and is the one people get wrong. Those two are why a published application exists for one machine and not for the one beside it in the shed.
The rest is worth knowing for a different reason. The mid-rollers (5) and the belt itself (9) are what wear out and get bought again; the tensioner (7) is the one adjustment you are expected to make yourself, several times a season.
One track unit, from the side
The unit bolts on where the wheel came off, and that is the whole idea: the drive sprocket is concentric with the hub mounting face, so the axle turns the sprocket, the sprocket turns the belt, and the frame stops the unit turning with it. Read the numbers in that order and the assembly explains itself.
The parts, one at a time
What the part is, what it does on the machine, and the term each manufacturer publishes for it. Where a maker does not name a part separately on its own pages, that is said rather than filled in — useful to know before you ring a parts desk asking for something by a name they do not use.
1. Hub mounting face
The machined plate, bolt circle and spacer stack that bolt the unit to the machine’s wheel hub in place of the wheel. It is the part of the assembly that is specific to your model rather than to the system, which is why a bolt pattern decides fitment.
It carries drive torque out of the axle and into the unit, and it carries the unit’s share of the vehicle’s weight. Its bolt pattern is the single measurement that most often decides whether a published application exists for a machine at all.
Camso names this piece after the hub and includes it: a kit ships as four units plus “adapted mount kit to fit tracks on your vehicle”. Kimpex names it after the job and sells it apart: the WS4 page instructs the buyer to “Select the proper track adapter (BOM1) depending on your VTT model”. One word, two commercial models.
2. Drive sprocket
A toothed wheel on the driven axle, concentric with the hub mounting face, running inside the loop at the top of the unit.
Its teeth engage the moulded drive lugs on the inner face of the belt. It is the only place in the assembly where rotation becomes track travel; everything else in the unit either guides the belt or holds the geometry.
Camso publishes a tooth-count range and selects within it per application; Kimpex publishes a single sprocket and a diameter. Those are two different kinds of statement and neither converts into the other.
3. Frame and arm
The structural member the wheels hang from: a triangulated assembly running from the drive axle down to the front idler and back along the unit to the rear idler.
It sets and holds the geometry of the whole unit — the wheelbase, the approach angle at the front, the length of the tail behind the axle. Nothing else in the assembly resists the load that tries to fold the unit up under braking.
Both publish steel. Only Kimpex publishes a section — the tube size — and only Camso’s parts breakdown shows the frame as separate left, right, front and rear members. Neither publishes enough to say whether that is a construction difference or only a difference in how spares are sold.
4. Front idler wheel
The undriven wheel at the leading end of the unit, usually the largest wheel below the axle.
It turns the belt around the front of the loop and sets the approach angle — the shape the unit presents to the obstacle it is about to climb. It takes the first impact of everything the machine hits.
5. Mid-rollers
The row of smaller wheels between the two idlers, running along the flat bottom of the belt. Diameters and count differ between systems and this drawing shows neither.
They carry the machine’s weight down onto the ground-contact length of the belt, and they decide how that weight is distributed along it. They are also the wear items an owner replaces most often.
Camso publishes two different bearing arrangements on two pages read the same day: the T4S page says “Molded bearing inside wheels”, the X4S page says “Standard and replaceable sealed bearings”. Both are Camso’s own words about its own ATV systems. Confirm against the system you actually have rather than against the other page.
6. Rear idler wheel
The undriven wheel at the trailing end of the unit, behind the axle.
It closes the loop at the back and carries the tail. The tail length behind the axle is what stops the unit rotating nose-down under drive, which is why the anti-rotation attachment and the rear idler are two halves of one problem.
7. Track tensioner
An adjuster acting on an idler axle or on the frame tail, with a threaded or cammed mechanism that lengthens the wheelbase of the unit.
It sets belt tension. Too little and the belt climbs off the wheels; too much and the bearings and the belt itself pay for it. It is the one adjustment an owner is expected to make and re-make over a season.
Kimpex publishes what the tensioner costs you in time: “Initial installation time: 1,5 hrs.” and “Subsequent installation time: 30 minutes”. Camso publishes no installation or swap time on either ATV page read. That is an absence of published figures, not a claim that a Camso swap takes longer.
8. Anti-rotation attachment
A link, bracket or rod between the unit’s frame and a fixed point on the vehicle — an A-arm, a swingarm or a chassis tab. In side elevation it is partly hidden behind the belt, which is why it is drawn broken here.
It stops the whole unit spinning around the axle with the wheel. Without it the unit would simply rotate under drive and under braking instead of the belt turning. It is the part that has to be matched to the machine’s rear suspension type, not merely to its bolt pattern.
This is the second real divergence and it is the one that changes an order. Camso publishes a spring and a damper inside the anti-rotation on the X4S. Kimpex publishes no spring and no damper for the WS4 — which is not a statement that the WS4 has none, only that Kimpex does not publish one. And where Camso includes the vehicle-specific hardware with the four units, Kimpex requires three separate selections: adapter, front anti-rotation, rear anti-rotation. Ordering a Commander track kit on its own does not put tracks on a machine.
9. Rubber track
The moulded belt itself: a reinforced rubber loop with drive lugs on the inside face and tread lugs on the outside.
It is the ground-contact surface and it is the whole reason for the assembly — it spreads the machine’s weight over an area instead of over four contact patches.
The two makers are not declaring the same quantity. Camso publishes ground coverage for the whole system; Kimpex publishes flotation surface, split front and rear. Neither states how the figure is arrived at, so the larger printed number is not evidence of the larger footprint. Use the figure published for the system you are actually buying.
10. Track lug
The moulded bars standing off the outer face of the belt.
They are what bites. Lug height is the figure most often quoted as a proxy for how a system behaves in soft ground, and it is published front and rear separately because the front and rear belts are not the same belt.
The rear figures agree: both publish 1.25 in. The front figures do not — Camso publishes 1.125 in, Kimpex 25 mm, which it renders as 1.00 in. Front and rear lugs differ on both systems, so a single quoted lug height for a kit is always half the specification.
Alternate names, as published
The table to keep open when you are reading a parts diagram, a used listing or a quote written by somebody else. The left column is the plain term; the other two are the manufacturers’ own words, so you can search either one and recognise what comes back.
| No. | Plain term | Camso publishes | Kimpex publishes |
|---|---|---|---|
| 1 | Hub mounting face | Hub & bearings — “Cast steel multi-bolt (4) pattern” on the X4S page; “Hub package”, “Multi model hub assembly”, “Multi hub spacer” and “Hub cap” among the service parts | Track adapter (BOM1) — selected per model, ordered separately from the track kit |
| 2 | Drive sprocket | Sprocket — published as a range, “15 to 18 teeth”; service parts are titled by tooth count and bolt count | Sprocket — published as one size, “15″ (381 mm) sprocket built for all season use” |
| 3 | Frame and arm | Frame — “Carbon steel” on the T4S page, “Solid steel frame” on the X4S; service parts are split left and right, front and rear, with a “Frame tail adjuster” and a “Frame extension” | Frame — “Triangulated frame composed of robust 2.5″ (64 mm) steel tubing” |
| 4 | Front idler wheel | Idler — “Double bearing bolted-on mid-roller & idler wheels” on the X4S page; service parts are titled “Idler wheel” by diameter, with long and short shafts | Not named separately. The WS4 page publishes only “wheels”, and describes the front of the unit by its behaviour: “Pronounced attack angle helps to clear obstacles” |
| 5 | Mid-rollers | Mid-roller wheels on the product pages — “Double bearing bolted-on mid-roller & idler wheels”. Camso's numbered service parts title the same part a bogey wheel, larger or smaller, per system | Wheels — “Wheels with two cap-protected ball bearings: low and easy maintenance” and “Wheels contact patch coated with rubber: Prevents ice from sticking” |
| 6 | Rear idler wheel | Idler — the same term and the same service-part family as the front | Not named separately. The WS4 page publishes a count instead of a part: “Three wheels on the ground for less steering effort” |
| 7 | Track tensioner | Tensioner — service parts are split front-short and rear-long and keyed to a serial family, alongside a “Tensioner adjustment screw”, a “Tensioner bushing” and a “Frame tail adjuster” | HD tensioner — “HD tensioner: Quick & easy to use” |
| 8 | Anti-rotation attachment | Anti-rotation — “Redesigned mild steel anti-rotation single rate spring and progressive damper” on the X4S page; service parts are titled by side and by suspension type, independent or rigid | Front anti-rotation (BOM2) and rear (BOM3) — “Select the proper Front anti-rotation (BOM2) and rear (BOM3)”, each a separate line on the order |
| 9 | Rubber track | Rubber track design — the X4S page publishes a profile, “F: Flex / R: Flat”, with “Flex-Track sides & slight inward curve” and a “Large contact patch”; footprint is published as ground coverage, “approx. 2000 sq. in.” | Track — “Aggressive track profile”; footprint is published as flotation surface, “1.32 m² / 2045 in² total = 0.61 m² / 945 in² front & 0.71 m² / 1100 in² rear” |
| 10 | Track lug | Lug height — “F: 1.125 in” and “R: 1.25 in” | Lug height — “25 mm / 1.00″ front, 32 mm / 1.25″ rear” |
Where the makers differ in approach, not in vocabulary
Most of the table above is translation. Two rows are not, and both are worth knowing before an order rather than after one.
What the belt runs on at the bottom
Kimpex publishes this as a feature of the Commander WS4, in two separate bullets on its own page:
System without slider shoe for all season performance
Three wheels on the ground for less steering effortkimpex.com, Commander WS4 track kit, read 2026-09-26
Camso publishes neither statement. Its T4S and X4S pages name a frame, a sprocket, an anti-rotation, hubs and bearings, wheels and bearings, a rubber track design, a mount kit, an idler and mid-roller wheels — and they do not mention a slider, a slide shoe or a hifax anywhere, and do not state how many wheels contact the ground. Camso does number a front and rear hifax guide among its service parts for the ATV systems, so a hifax wear part exists on them.
What that hifax does on the bench — whether it carries load the way a snowmobile slide rail does, or only keeps the belt aligned across the wheels — Camso does not publish. It matters because a loaded slider is a consumable with a replacement interval and an alignment guide is not, so ask the shop whether the system you are pricing has a wear part there and what it costs to change.
What counts as part of the kit
Camso publishes a kit as four units plus the vehicle-specific hardware, in one line: “4 track systems (2 front, 2 rear) & adapted mount kit to fit tracks on your vehicle.” Kimpex publishes three separate selections — the track kit, then the track adapter for the machine, then front and rear anti-rotation — and instructs the buyer to choose each. On a Commander order the adapter and the anti-rotation kits are line items of their own.
That is the single most common surprise on a first track purchase, and it is a difference in how the product is assembled and sold rather than a difference in what the parts are called. Both approaches put the same parts on the machine. Only one of them lets you leave them out of the basket.
The sprocket: a range on one side, one size on the other
Camso publishes a range, 15 to 18 teeth; Kimpex publishes one sprocket and its diameter. The published applications record a front and rear tooth-count pair per application, and the pairs in it run 15–18 — which is Camso’s published range and not a broader one.
There are 11 distinct front-and-rear pairs in the published applications. The number of Commander WS4 rows carrying a pair at all is 0, which is consistent with Kimpex publishing a single sprocket rather than selecting one per machine.
What that means when you order: on the Camso side the sprocket is part of the fitment answer, so the front and rear tooth counts belong on the order beside the machine and the year — and they are worth writing down off the system you already own, because a replacement sprocket is ordered against the system rather than against the quad. On the Kimpex side there is one sprocket and nothing to choose.
ATV application rows only, custom one-off builds excluded. Published applications read 2026-09-26.
Six things to ask before you order, because neither maker publishes them
Each of these is an absence in the manufacturers’ own material as read on 2026-09-26, and each one is answerable across a parts counter in a minute. Take the list with you.
- How many mid-rollers per unit, and are they all the same size? Neither page states a count or a spacing, and mid-rollers are the part you replace most often — so the count is also the size of every future bill for them.
- How long does the seasonal swap take on my machine? Kimpex publishes 1.5 hours to install and 30 minutes thereafter. Camso publishes no install or swap time for either ATV system, so the figure has to come from whoever does the work.
- Which spares are stocked for the system I am buying? Camso sells the unit broken down into named service parts — wheels, bearings, tensioners, hifax guides, frame members. Kimpex publishes no equivalent breakdown for the Commander at all, so ask what a single wheel, bearing or tensioner costs before you need one.
- Does my anti-rotation have a spring and damper in it? Camso publishes a single-rate spring and a progressive damper in the X4S anti-rotation and says nothing either way about the T4S. It is a sprung link on one system and an unknown on the other, and it is the part that takes the load every time the unit tries to rotate.
- Which footprint figure applies to my set? Camso publishes ground coverage, Kimpex publishes flotation surface, and neither says how the figure is taken. The number is not comparable across makers, so get the one for the system going on your machine.
- What is in an S-KIT part? Many Camso service parts carry that prefix and Camso does not publish what it means, so confirm what is in the box before ordering one as a single item.
Manufacturer figures on this page were read 2026-09-26 from the pages linked beside them. Both makers revise those pages; re-check before quoting any figure here anywhere it carries commercial weight.