Stud Charts

Enter your snowmobile to find your application

 

Finding the correct application for your snowmobile is not straight forward.  That's why we created our snowmobile studs size chart so the only thing you need to do is enter your model.  Buying the correct stud kit has never been easier!  If want to know the technical aspect that goes into our recommendation continue reading below.

 

The determining factor for the stud you will run in your track is the lug height. All recommendations presume the lug height is equal to the height in new condition. Wear on a used track can cause you to move down a size. To learn more about measuring lug height, check out our guide here.

Lug Height	Track Thickness (Varies +or- .03”)	Stud Size (Effective Length)	Stud Overall Length	Penetration	Recommended Nut
0.82"	.250”	1.000"	1.375”	~0.375”	Zinc or SS
0.88"	.250”	1.000"	1.375”	~0.375”	Zinc or SS
0.91"	.250”	1.075"	1.425”	~0.375”	Zinc or SS
1"	.250”	1.175"	1.525”	~0.375”	Zinc or SS
1.25"	.250”	1.375"	1.725”	~0.375”	Zinc or SS
1.352" Cobra	.250”	1.375"	1.725”	~0.375”	Zinc or SS
1.375"	.250”	1.500"	1.850”	~0.375”	1/2” Tall Nut
1.500"	.250”	1.625"	1.950”	~0.375”	5/8” Tall Nut
1.6" Cobra	.250”	1.625"	1.950”	~0.375”	5/8” Tall Nut
1.75"	.250”	1.920"	2.225”	~0.375”	3/4” Tall Nut

 

 

Track Length	Pitch (Distance Between Lugs)	Track Windows	Stud QTY 2X Row	Stud QTY 3X Row	Stud QTY 4X Row
120	2.86”	42	84	126	168
121	2.52”	48	96	144	192
128	2.52”	51	102	153	204
129	2.86”	45	90	135	180
133	2.52”	53	106	159	212
136	2.52”	54	108	162	216
137	2.86”	48	96	144	192
141	3.00”	47	94	141	188
144	2.52”	57	114	171	228
146	2.86”	51	102	153	204
151	2.52”	60	120	180	240
154	2.86”	54	108	162	216
155	2.86”	54	108	162	216
156	2.52”	62	124	186	248

 

Horsepower	Studs Per Track Window
0-110	2
111-130	2 or 3
131-180	3 or 4
180	4

 

 

The amount of horsepower and track length are the two factors determining the number of studs you will run. As you increase horsepower, you need to take the added torque off the studs/track. For example, going from 2 to 3 per row, you'll reduce the load by 33% and spreads the stress evenly among the track.

 

All of our application recommendations are based on 30 years of R&D and feedback from our customers. Our data spans tens of thousands of snowmobiles in every environment. We advise staying within the recommendations as it is the optimum length/quantity for longevity and effectiveness.  

 

Running studs longer or quantities less than recommended voids the lifetime warranty against breakage on kits, can cause premature wear and damage to the track/studs. Online sites can be a good source of information, but we see a lot of bad advice regarding studding. One user's experience running outside of recommendation is only one data point versus the thousands we've collected.  

FAQ

Can I run a pattern of 2-3-2-3 or 4-3-4-3?

Yes, you can, and if you buy a stud kit and would like a pattern for that amount, we can custom make you one. We prefer a consistent amount because those patterns cannot be balanced and create an uneven layout.

Can I make a 4-2-4-2 pattern?

Of course, but we recommend sticking to 3 per row. By going 4-2, half of your track windows will have more strain than the other half. By running 3-3-3-3, you'll still have the same amount of studs on the ground and are spreading the stress evenly across the track. Our 3-3-3-3 patterns are also balanced; each stud is counterbalanced on the next row.

I want the most traction. What happens if I use a taller than recommended stud?

Running a taller than recommended stud is a short-term choice. By going higher than 3/8" penetration, the stud will no longer be supported by the lug and will increase the instances you are ridding only on the stud, like on road crossings or low snow conditions. This will increase the speed the stud wears, make it susceptible to bending, and put added stress on a track.  

Can I run a quantity less than recommended, so it hooks up better?

Running fewer studs is not a good way to increase hook-up by increasing the load on each stud. Tracks are not like a bed of nails, and you will need to match the machine's horsepower to spread the load. It is your snowmobile, and you are free to do stud it how you'd like but keep you lose the lifetime warranty against breakage by running outside our recommendation.

My lug height is 1.25, and the stud is 1.375", which's only 1/8" of penetration. Will that even do anything?

While it looks like it's only 1/8" higher on paper, our chart shows that setup will have about 3/8" of penetration. Stud measurements come from the t-nut days and don't make the most sense with push-through studs. You can learn more about how they are measured here.

How come you recommend tall nuts starting at 1.500" studs and not 1.375"?

The standard nut covers the same thread as a flat backer with a tall nut with our XL backer.

Why do the 1.35 and 1.6" Cobra tracks have recommendations of sizes so close to the lug height?

Cobra tracks have teeth on top of the lug that is about 0.10" that are counted to the overall length. The actual lugs have an effective height of 1.25 and 1.5. You can learn more about these tracks here.

Do you have studs for tracks over 2" lugs?

No, the stud generates too much leverage at that height and is not feasible for the track.

How come a 121" track has the same amount of windows as a 137" track?

Starting in the 2007-08 model years, Camso introduced the 2.86" pitch track. Windows were spaced wider, reducing the number of lugs to save weight. A fast way to get the number of windows is to divide the track length by pitch. 121/2.52 = ~48, 137/2.86 = ~48.

What's the minimum amount of studs I can run on my track?

For low horsepower applications, the minimum is 2 per row. Keep in mind only 40% of the studs are on the ground at a time, so running 48 studs would put only 20 studs on the ground at a time. That's a lot of extra stress on the track at those few points. For higher horsepower, that number jumps up to 3x and 4x per row.