Snowmobile Polaris DEEP SNOW (2005 year). Manual - part 52
REAR SUSPENSION
11.6
ROUND SPRINGS VS SQUARE SPRINGS
Many snowmobiles now utilize a square profile rear torsion spring. Square springs are lighter in weight (1.5 lbs.), and smaller
in packaging. The square coils take up less room, therefore allowing the carrier wheels to be positioned more inward in the tunnel.
Another benefit of the square profile spring is the ability to maintain the same characteristics of the round spring, but have fewer
coils of wire.
The square profile springs will not retrofit to previous models. The length of the coil stack is shorter on the square springs and
the inside diameter of the coil stack is also smaller.
The spring rates between the round wire springs and the square wire springs are identical. For example: 7041465-067 has same
spring rate as 7041631-067 even though the wire diameter is different. The chart below shows equal spring rates between round
wire and square wire torsion springs.
Square wire torsion springs will not fit in machines that come with round wire springs standard.
Round Spring
Square Spring
Last 3 digits of part number
Last 3 digits of part number
Larger inside diameter
Smaller inside diameter
4.5”
3.5”