I have a 97 softail custom, with FLSTF front end.

I have bought a fork spring (NOT a lowering one) from progressive suspension, but I really donīt know the right size for the pvc spacers I gotta use.

Does anyone can help me?

 

If you are not lowering the bike and you are keeping stock height, I would say go to progressives website and find your springs part number, you should then be able to find the installation PDF file that will tell you what you need to know.
http://www.progressivesuspension.com/










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Evo,

Just recently I installed a set of “stock height” Progressive Springs in my 02 Fatboy. My Fatboy is fully dressed and I weigh 195 pounds. Over the phone, a Progressive Tech Rep recommended that I Do Not cut the spacer. I installed everything “as is” without cutting the spacer and filled the forks with Amsoil Shock Therapy 5 wt fork oil. I used the “Measure Method” to fill the forks with oil to 5.5 inches from the top.

On relatively smooth roads, the bike rode and handled phenomenally however on rough roads, the front end felt “Springy”. The springs had too much Preload and the Rebound was insufficiently dampened. I changed the fork oil to 10w but this compounded the problem. After putting about 500 miles on the bike to allow the springs time to settle-in, I disassembled the forks and trimmed the spacers to 1 inch above the tube and refilled with the 5w oil. I now consider the ride and handling perfect for me.

To find that perfect ride you desire, I recommend you experiment with the spacer length and oil weight. It’s a bit time consuming but worth the effort.

Good luck.

 

I had the replacement progressive Springs in my bike. They improved the ride. The spacers work to preload the forks so the amount of preload is dependent on the weight. On my bike Im 210 lbs and I ended up cutting the PVC to about 1/2 in above the top of forks with the front wheel off the ground and that gave me the ride I wanted. I also changed the fort oil to SE heavy