Woody's 2002-2003 Safety & Performance Trail Catalog (page 4)
3. Select the stud design and shank size (7mm or 5/16"), taking into
consideration your riding style. The 7mm studs
are smaller in diameter at both the head and shank, therefore lighter...
These studs can be used on snowmobiles with a
horsepower rating of 100 or less. The 5/16"
studs have a larger head and shank... Sleds
over 100 horsepower (600cc range) and performance riding are good benchmarks
for a decision to use 5/16" studs.
How much R&D can it take to beef up the shaft by only .020?
This shows that Fast Trac has been the leader, in providing studs that meet the demands of aggressive trail riders.
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