Posts
6256
Joined
8/15/2006
Location
Cornland, IL
US
Fantasy
138th
Seat bounce
Upgrade to enjoy this feature!
Vital MX fantasy is free to play, but paid users have great benefits. Paid member benefits:
- View and download rider stats
- Pick trends
- Create a private league
- And more!
Only $10 for all 2024 SX, MX, and SMX series (regularly $30).
The Shop
At my age I hate to do it because it is sketchy if you don't do it right. But it is fun to launch on a short runup to a jump.
I’ll let the other Vitards with engineering certifications confirm with me, but to my knowledge it goes back up.
How can the shock pogo you up when it has damping? Why don't you bounce when you land from a jump? How does it spring you higher when it doesn't even extend until after you've left the ramp?
You're changing your trajectory. Not literally bouncing.
TFS's contention was that the spring can only return the same amount of force back to the bike; enough to return the seat to its original position. No more, no less.
Seat bouncers believe that by sitting, you put more force into the shock spring, which then returns more force.
Actually, the answer lies between the inertia of the subframe assembly and the rider's inertia, relative to the footpegs as a moment in time. If the rider sits, and then allows the spring to push his body along with the subframe, it changes the interplay between the bike and rider. The spring can only push the subframe back to its original position, true, but it cannot stop the rider's momentum once it gets there. The rider will continue to move upward and bring the bike with him (assuming he holds on). While standing tends to isolate the bike from the rider and thus dampen the rebound force, sitting pairs them, thus maximizing the rebound force.
One argument the non-bouncers forwarded was that "if seat bouncing works, why don't the bikes bounce off the ground when they land?" Look no further than the tabletop-to-tabletop hop that was popular several seasons ago for the answer: they do, when the rider times the landing accordingly.
Seat bouncing is not about more force in the spring; it is about timing the interplay between the rider's own momentum and the bike's.
My friend asked him in the bits and he was pretty chill about it. I think it comes natural without thinking about it for him.
There is no bounce/spring upward effect.
Thank you TFS.
EDIT:
It was Jimmy Albertson, but he hooks his foot under the shiftlever not the peg. Maybe the same principle applies. Who knows
https://youtu.be/NH3LH4FkIVw
Pit Row
The tire has no rebound damping,
And also if you get down into the bump stop that will over power the rebound of the shock.
Unfortunately I have the video to show it
If a shock with rebound has no effect, tell me why it doesn't stay in the fully collapsed position? Of course it extends, just not 'immediately" just like a door closer.
https://motocrossactionmag.com/amp/seen-new-mxa-jam-packed-full-motocro…
Here's some chum. How does a low-rider get off the ground?
Let's talk the pre-scrub days... How did Jeremy McGrath master the art of staying lower on jumps? By compressing the forks more (pushing into them more off the face of jumps). Lower angle, lower trajectory.
https://www.youtube.com/watch?v=IROFvm2fpBI
Anyone ever try seat bouncing one of these hardtails?
How do people think you can pump a bicycle when it has no shocks and no motor, yet you can pick up speed without pedaling?
With the momentum generated by the rider's body movements in conjunction with the rollers on the pump track. How do you swing on a swing?
Different concepts I'd say, but I'm loving the debate.
Post a reply to: Seat bounce