REAR SUSPENSION/TRACK/TRACTION
7.35
Traction
The amount of traction required varies depending upon the type of riding and the snowmobile’s horsepower.
Studs are designed specifically for each riding category. They’re made in various lengths, shapes, and materials.
Improperly applied studs can cause poor traction and premature wear. Studs which are too long can cause dam-
age to the tunnel and heat exchangers.
Stud points fall into two categories: conical and scoopers. Conical studs (or picks) penetrate into the ground for
increased traction. Scoopers use a flat surface to hold more ground for traction. Generally, a penetrating point
is used for hard ground surfaces and ice. Scoopers are used on softer surfaces.
Material contributes more to stud life and cost than to functionality. Carbide is the most durable and lasts much
longer than steel. Studs should be installed no closer than 3/4sfrom the edges of the track. Avoid the center of
the track because there is poor support in this area. The track’s center belt controls acceleration. The two smaller
outside track belts contribute to acceleration, and have the largest affect on cornering. The following chart is a
guideline for the quantity of studs to install.
Horsepower
Snowcross/
Cross Country
Drag
50-60 HP 96 Studs 96 Studs
60-75 HP 96 Studs 120 Studs
75-100 HP 120 Studs 144 Studs
100-125 HP 144 Studs 168 Studs
120-130 HP 168 Studs 192 Studs
125-150 HP 192 Studs 240 Studs
130-170 HP 240 Studs 240 Studs
S Be sure to check allowable clearance between the track and tunnel or heat exchangers, factoring
in suspension travel.
S Do not place studs under the tunnel protector strips (directly above slide rails on underside of tunnel).
Tunnel protectors are vital components and must not be subjected to stud damage.
S V-shaped stud patterns with the least repetition work best. Studs should cover as many different lines
in the ice as possible.
S Studs closest to the slide rails provide the most effectiveness, because the weight of the sled is con-
centrated in this area.
ALWAYS REFER TO YOUR ISR ON RACE AFFILIATE FOR STUD RULES PRIOR TO STUDDING
YOUR TRACK.
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