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Rockshox Motion Control conversion to TPC+ damping

Aug 21, 2013 at 1:01
by scar 4me  
RS Sektance TPC damper next to the Motion Control damper it replaces.
Rockshox Sektance. Custom TPC Compression damper from a Manitou Stance in a RS Sektor
Rockshox Sektance. Custom TPC Compression damper from a Manitou Stance in a RS Sektor
Just thought I'd post this, as i'm feeling rather chuffed at the moment! Smile
I've just successfully converted a set of Rockshox Sektor's to use a TPC+ compression assembly.
So I've now got a set of Secktance's

I went for the easy option and used a non-externally adjustable Stance assembly.
Then stripped the Motion Control damper down till I just had the top-cap.
Fully compressed the fork to confirm the exact clearance to the rebound piston at bottom out.
Then used this as a guide for the TPC+ total damper length. (I wanted to maximize the damper length and not just go by the Motion Control length)
As it was their was only 8mm between the measurements, so I left a 3mm clearance on the TPC+ damper.

I had to set the TPC floating piston length to its shortest setting, and then cut off the excess below this.
Then I cut down the main compression mounting rod to the correct length, threaded the ID of it to an M6 thread, then got the correct size of seal, and got some spacers so that it sealed the topcap fully.

I also had to seal the thread to the bolt with some penetrating loctite 209, and then cut through a slit into the rod's center chamber.
This was needed to maximize the air volume available above the TPC pistons, and minimize the ramp up due to rebound shaft displacement.
If I was to do it next time, I'd use one of the Sektor Air topcaps, so that you would also get damper progressiveness pressure adjustment.

Then I also had to lathe down the TPC pistons to fit the Sektor stantions. (leaving the glide rings off as the pistons are plastic anyway)
Once this was done I calculated the oil level so that it was just over the top TPC piston, and put it all together.

Been out for a ride on it today, and deffinately puts the fork into a different league for bump compliance!


For any of you out there that fancy trying it, the challenge is deffinately worth the result!


Scar

Author Info:
scar4me avatar

Member since Sep 4, 2001
4 articles

3 Comments
  • 1 0
 I've already tried ABS+, External TPC+ and CID dampers.
All of the others add a lot of complexity as the mounting rods all thread into their respective topcaps, and have the adjusters going through.
So you'd have to machine back the Manitou topcap to the Rockshox thread specs to get it to work. (aswell as down sizing the actual damper piston.)
This was the simplest option, as the adjuster is an allen key just above the top piston, and the mounting rod is just a hollow shaft up to the solid topcap so allowed me to use the existing top-cap to mount it all up.
Let me know if you do give it a go, as I might be able to provide some advice to avoid problems.
  • 1 0
 Exactly what I have been looking for, for my Sektors and wife's Revelations. Thanks for taking all the guesswork out of it. Still going strong? Anything you would change? Cheers.
  • 1 0
 This is amazing, I now really want to try and put and ABS + damper in my recon golds, if I can see a way to do it i will contact you.







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