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CascadeComponents Added a reply to The flex stay discussion thread

6/21/2025 9:19am
When you apply a vertical load to the axle, the chain stay is largely in tension and the seat stay is largely in compression. In the case of the Blur, the seat stay is the bit that flexes. It happens to be one of the ones where the flex designed to occur over the length of the seat stay as...

CascadeComponents Added a reply to The flex stay discussion thread

6/20/2025 7:38pm
The strange behavior at the shock you can see there is due to the tire. In my opinion most, if not all, the suspension performance gripes that people have with flex stay bikes is mostly due to the fact that they are typically less gravity oriented so suspension performance for descending is not prioritized. The Stumpjumper 15 and the Stumpjumper...

CascadeComponents Added a reply to The flex stay discussion thread

6/20/2025 7:10pm
It’s almost like the concept of a balance board. If the load is directly in line with the center of the flexure, the only thing that will cause the flexure to deflect is articulation of the suspension that requires displacement at the shock. Where you run into problems is if someone has mistakenly put the flexure outside of the load...

CascadeComponents Added a reply to The flex stay discussion thread

6/20/2025 3:57pm
Regardless of whether any given frame member is in tension or compression, for the flex stay to move as a joint in the suspension the shock must also move. Thinking about it as a torsion spring, if you say at full compression the spring is wound up its maximum amount, for it to unwind the shock must extend. The extension...

CascadeComponents Added a reply to The flex stay discussion thread

6/20/2025 12:36pm
I think a lot of people get caught up in viewing the shock and spring as one unit. You can look at them as separate entities and the impact of a flex stay makes more sense. The total spring forcing the bike back to top of travel is the combination of the flex stay and the spring on the shock...

hamncheez2003 Liked a reply to forum topic MTB Tech Rumors and Innovation

6/17/2025 2:20pm
SOLUTION: handlebars that mount to the crowns! Just make sure you wear a full face
This forum topic has 30444 replies.

DubC Liked a reply to forum topic Have We Been Measuring Sag Wrong? (and how to fix it...)

6/16/2025 12:14pm
What a time to be alive. Unbound opulence. Kids, make sure you understand the gradient of the trail you are riding that day too so you can make sag adjustments based on likely weight distribution changes due to gradient variances. Spend 1-2 hours on bike setup/prep. Ride ~4-5 laps of 3-5 minutes each (total ride time 12-25 minutes). Spend 2 hours analyzing data, posting strava, posting grams, posting trailforks, posting youtubes, arguing with netbangers. Sit back, soak in all the WINNING. This is TRULY what peak cycling enjoyment looks like.
This forum topic has 48 replies.

CascadeComponents Added a reply to Kinematics

6/16/2025 9:54am
Glad to hear you've got things running well! Also I really appreciate the meme. On another note, and this is kind of unrelated to suspension but related to bike handling. I have a theory about the resurgence of steering dampers. Beside steering dampers, as of late people have been into short stems. I think one thing that gets glossed over...

ebruner Liked a reply to forum topic Kinematics

6/16/2025 9:48am
@CascadeComponents thanks for all of the help/feedback on setup changes and reality checks for me on my nomad. I tossed the cascade link on, put the vorsprung tractiv tuned superdeluxe on and threw the smashpot in my fox 38 and the bike is unbelievable right now. I definitely feel like the added bit of progression to the suspension made it easier for me to hit the feeling I wanted in the suspension across the board. Spring rate/support, rebound speed, compression settings, etc. Also, the additional chainstay length is so, so choice and really just tied the whole room together.
This forum topic has 291 replies.
This is an example of percent wheel travel as a function of percent shock travel. In this example, all have 160 mm of travel and a perfectly linear (in the mathematical sense ie. in the form mx+b) leverage curve. The green line is 50%, the blue line is 30%, and the orange line is 10%. The largest difference in percentage...

Sonofbovril2 Liked a reply to forum topic Have We Been Measuring Sag Wrong? (and how to fix it...)

6/15/2025 12:19pm
It’s not important how accurate your sag measurement is, what is important is that you measure it the same way consistently. Most air gauges and weight scales are not all exactly accurate or calibrated but who cares!? As long as you are measuring the same way consistently then you can find the sag that works for you, even if it’s 31,5% The fact is that sag as a measurement is a subjective number because we all have different tastes in how our suspension should ride and feel, it isn’t about hitting some exact specifically accurate measurement of sag that is...
This forum topic has 48 replies.
No, we haven’t been measuring sag wrong. Any method of measuring sag that is repeatable is an acceptable way to measure sag. As it is something that must be tuned as opposed to setting to a specific percentage, being able to repeatably measure sag is the most important thing. You can do this seated and measuring at the shock just...

Buckets Up Liked a reply to forum topic Have We Been Measuring Sag Wrong? (and how to fix it...)

6/15/2025 11:18am
Unless you have a bike with a very specific leverage curve designed around a specific sag point (old Santa Cruz?) sag seems almost completely irrelevant. Set up your suspension to your preferences for how it behaves dynamically on the trail not a single static value.
This forum topic has 48 replies.

noideamtber Liked a reply to forum topic Have We Been Measuring Sag Wrong? (and how to fix it...)

6/15/2025 11:18am
Id have no idea what sag im running. other than a starting point, thats all its good for - in the rear i'd guess closer to 20% than 30%(based on shock stroke) my bikes ride sick since I stopped caring about "but im about 30/20% sag"
This forum topic has 48 replies.

CascadeComponents Added a reply to Kinematics

6/14/2025 9:22am
That would make a lot more sense to me. For a given wheel speed, damping force as felt at the wheel is proportional to 1/leverage^2 so any time the leverage curve is progressive you will effectively get position sensitive damping as felt at the wheel. The assumption here being that if you run over a root, for example, the wheel...

AgrAde Liked a reply to forum topic Kinematics

6/14/2025 9:19am
The bikes that have a linear damper and progressive spring on separate parts of the linkage just mimic the behavior of a rampy air spring on a linear bike. Which everyone decided was terrible years ago. I don't see the advantage of mimicking that behavior with a coil. Linear bikes with a rampy air spring feel inconsistent as all hell with their damping IMO. I wish I could have a progressive linkage for my fork damper too.
This forum topic has 291 replies.

CascadeComponents Added a reply to Kinematics

6/13/2025 10:35pm
I find the “consistent damping” thing interesting because I’ve never really seen a good argument for why you would want damping force to be the same for a given impact speed at any point in travel. I can see plenty of reasons you’d want damping to get stiffer deeper in travel. This is exactly why bypass shocks are a thing...

CascadeComponents Added a reply to Kinematics

6/4/2025 12:18pm
Large volume air shocks like the X2 and Vivid arguably work better on higher progression layouts, as they lack mid-stroke support compared to coil shocks and have minimal ramp at the end of travel. See Sram's graph for reference:

CascadeComponents Added a reply to Kinematics

5/29/2025 6:13pm
Adding to this and tying back into damping force as you feel it at the wheel being inversely proportional to leverage ratio squared, if you are riding too deep in travel it’s easy to find yourself in a spot where you get spikes in damping force more often.