7mm or 5/16"

The finest wear rods and... we can prove it!


Woody's 1993 Catalog

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.
 


1/4"    7mm    5/16"

 
Push-Thru Stud History
                     
  Hot Tip Pro-Tracks Fast Trac Roetin Woody
1st Push-thru
1st 5/16"stud
1st stainless stud
  1975
1975
  1986   1991
1991
1991
  1992
2002
  1993
1995
2003

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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