UTV Inc · Fitment Guide
Nearly every part we machine clamps to a cage bar, and every clamp is cut for one tube size. Here is how to find yours in under a minute — with calipers, or with a piece of string.
Measure the outside diameter of the bar the part clamps to. No calipers? Wrap a tape all the way around the tube and divide by 3.14 — 5.50 in around is a 1.75 in tube, 6.28 in around is a 2 in tube.
Mirrors, whip mounts, GoPro mounts, light bar brackets, spare tire carriers, headset hangers — they all start as a billet clamp bored for one specific diameter. Get the number right and the part goes on in about five minutes. Get it wrong and nothing closes around the tube. This is the question we field most on the phone, so here is the whole answer in one place.
Start here
The only number that matters
Clamp-on parts are sized by the outside diameter of the tube: straight across the outside, through the center. Not the inside. Not the wall thickness. Not what the cage builder calls it in their catalog.
In the UTV world, tube size is always stated as actual outside diameter. A 1.75 in cage tube really does measure 1.75 in across. That trips people up because plumbing pipe works the opposite way, where “1.5 inch pipe” is a nominal name and the real outside diameter is something else entirely. Cage tube is not pipe. What you measure is what you order.
Two ways
How to measure your cage tube
Method 1 — calipers
Open a set of calipers across the widest part of the tube, through the center, and read the number. Measure bare tube where you can, and check two or three spots along the same bar — a dent or a weld bead will throw the reading off. The sizes we build for sit as little as 0.125 in apart, so a reading of 1.81 in almost certainly means a 1.875 in tube wearing some coating, not a 1.75 in tube.
Method 2 — a tape or a piece of string
This is the method we walk customers through on the phone, and it beats eyeballing a ruler across a curved surface.
Wrap it
Run a flexible tape measure — or a piece of string you then lay flat against a ruler — all the way around the tube.
Pull it snug
No slack, no overlap. The tape should sit flat against the tube the whole way around.
Read it
That number is the circumference — the distance around the outside of the tube.
Divide by 3.14
The result is your tube size. Match it to the chart below and order that clamp.
The reason this works so well is that the sizes spread out when you measure around instead of across. Two tube sizes only an eighth of an inch apart in diameter are nearly half an inch apart in circumference — and half an inch is easy to read on a tape.
Circumference to tube size
| If you measure around the tube | Your tube size is |
|---|---|
| 3.14 in | 1 in |
| 3.93 in | 1.25 in |
| 4.71 in | 1.5 in |
| 5.11 in | 1.625 in |
| 5.50 in most common | 1.75 in |
| 5.89 in | 1.875 in |
| 6.28 in newer chassis | 2 in |
Land between two rows and you are almost certainly reading a powder coated or wrapped tube. Round down to the nearest size on the list, not up.
Our catalog
What size we build most often
We machine clamp-on parts in 1 in, 1.25 in, 1.5 in, 1.625 in, 1.75 in, 1.875 in and 2 in. By a wide margin, 1.75 in and 2 in are the two that move. Here is what most of our clamp-on parts are built in, platform by platform — a starting point for what to expect, never a substitute for measuring.
| Platform | Size we build most |
|---|---|
| RZR XP 1000, XP Turbo, XP Turbo S | 1.75 in |
| RZR XP 900, RZR 800, RS1 | 1.75 in |
| RZR Pro XP, Pro R, Turbo R | 2 in |
| Honda Talon 1000 | 2 in |
| Can-Am Maverick, Commander | 2 in |
Notice the split. The older RZR platforms run smaller tube than the newer Pro and Turbo R chassis, so if you moved up from an XP 1000 to a Pro XP and kept your old mirrors in a box, they will not clamp onto the new car.
Exceptions
Why your cage might not match
Aftermarket cage
Cage builders pick their own tube, and plenty run a different diameter than the factory bar they replaced. If your cage was not bolted on at the dealership, measure it. The chart above describes our catalog, not your car.
One cage, several sizes
A main hoop, an A-pillar and a roof crossbar are not always the same tube. Measure the exact bar the part clamps to — the A-pillar you want the mirror on, not the bar over your head.
Coating adds thickness
Powder coat, bedliner and vinyl wrap all add material. A wrapped 1.75 in tube can read 1.80 in or more. It is still a 1.75 in tube, and a 1.75 in clamp is still the right part.
Previous owner
Cars change hands and parts get swapped. If you bought it used, trust the tape over the spec sheet.
Avoid these
Mistakes we see most
Measuring the inside
Calipers stuck into the open end of a tube give you the bore, which is smaller than what you need by twice the wall thickness.
Measuring across a weld
A weld bead or a dent reads high. Move a few inches down the bar and try again.
Trusting a spec sheet
Model years change and previous owners swap parts. Sixty seconds with a tape beats a forum post.
Ordering to fit the hardware
Bolt size and tube size are unrelated numbers. The clamp bore is what has to match.
Next
Once you know your size
Shop by tube size
Every clamp-on part we make, filtered to the diameter you just measured.
Shop by machine
Start from your make, model and generation instead of the tape measure.
1.75 in parts
The most common cage size, and the biggest section of our clamp-on catalog.
The parts people buy by size most often are mirrors, whip mounts, light bar and A-pillar mounts, spare tire mounts, GoPro mounts and headset hangers.
Questions we get
Frequently asked
What size is a Polaris RZR roll cage?
It depends on the generation. Most of our clamp-on parts for the RZR XP 1000, XP Turbo, XP Turbo S, XP 900, RZR 800 and RS1 are built in 1.75 in, while the Pro XP, Pro R and Turbo R platforms take 2 in. Measure before ordering, especially if the cage has been replaced.
Is roll cage tube measured inside or outside?
Outside. Clamp-on parts are sized by the outside diameter of the tube. Inside diameter and wall thickness do not affect which clamp you need.
How do I measure roll cage tube size without calipers?
Wrap a flexible tape measure or a piece of string around the tube, read the circumference, and divide by 3.14. A reading of 5.50 in is a 1.75 in tube; 6.28 in is a 2 in tube.
Will a 1.75 in clamp fit a 1.875 in tube?
No. The clamp will not close around the larger tube, and it does not work the other way either — a 1.875 in clamp on a 1.75 in tube will not hold. The sizes are an eighth of an inch apart and they are not interchangeable.
Does powder coating change what size I need?
No. Order for the bare tube size. Coating can add a few thousandths to your measurement, so if you read slightly over a listed size, round down.
Still not sure? Call us.
Everything we make is cut from 6061 billet aluminum on our own machines in Mesa, Arizona, the same way it has been since 2004. If you measured and the number still does not look right, tell us what you got and what you are trying to mount.
(480) 718-5511 · sales@utvinc.com · Monday to Friday, 8:00 AM to 5:00 PM Arizona time
We would rather talk it through than have you send a part back.