USD fork identification help

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • machspeed
    • Jan 2026

    #1

    USD fork identification help

    I recently picked up a bike that has 91 GSXR usd forks or so I was told. I need to change the fork seals and I do not know which ones I need to get. The previous owner had someone else do the swap for him and does not remember if they are from a 750 or an 1100. If in fact they are from a 91 GSXR how do tell what size bike they are from?
  • still_bluenoser

    #2
    The 1100 forks are longer. I forget the dimensions.

    Comment

    • Guest

      #3
      Measure the lower part of the fork, the shiney part where the seal rides , the 1100 is a 41mm, and the 750 is a 43mm according to the PU catalog.

      Comment

      • machspeed

        #4
        Thanks guys, that atleast gets me in the right direction. Any easy way to verify what they really came off of in case they are not from a 91 gsxr? They are not gold but they came with 6 piston Tokico calipers but I think these may have been an upgrade from the original 4 piston calipers. Will 6 piston calipers easily mount to 91 gsxr forks without the use of adapters?

        Comment

        • still_bluenoser

          #5
          the 1100 came with them later on. They are a direct bolt on.

          Comment

          Working...