Fork Rebound?

[DeltaOscar]

I ride a Trek Fuel 100 Team Issue, full carbon with a RockShox Reba Team fork. It's a sweet setup. Just one issue - when bombing down corrugated fireroads as we approach 50km/h the fork seems to just give up trying and starts to rattle me to death. It gets so bad I literally cannot see where i'm going. There almost seems be a sympathetic resonance through the frame. Any ideas? Is it a rebound setting on the fork? Or am I not going fast enough?  

[supertorro]

Sounds like a rebound issue, that would be my first guess.... try changing it and see if gets better or worse

 

 

[Dicky DQ]

Definatly a rebound issue. If your rebound is too slow the shock effectivly collapses as after each quick compression there is not enough time for the shock to return to the home position. When the next event takes place the shock has less travel and so on until the shock just rests on itself and it now behaves like a solif fork.

 

Turn the rebound skrew (usually a red knob on the bottom of the Reba) all the way towards the rabit and start dialing it slower untill you find the right setting for you.