Avg_Joe
Well-Known Member
- Region
- USA
- City
- RDU, NC
I rode both of my bikes with the Suntour seatpost this weekend, and actually thought about this thread. Just some random musings:
On my Rad Rover, which is an upright riding position, the NCX is bouncier and requires more preload to smooth out. However, it's not so bouncy that it throws me around, just bobbed more than I cared for. But once preload is set, it was a smooth ride, and only the most egregious hits caused any bobbing (talking 4" diameter exposed tree roots).
On my Vado, which is more of an active/sport riding position, the NCX with slight preload is extremely smooth and predictable. I also flipped the top mount around to negate the inherent rearward offset of the NCX (see: https://electricbikereview.com/forums/threads/whats-not-said-about-suntour-ncx-seatpost.48561/)
Not a mechanical engineer or anything, but it seems to this novice that when rider weight is positioned directly above the parallelogram, you wind up with 1) duh, more weight directly on the spring (increasing the need for preload or a heavier spring rate if beyond the parameters of the stock spring) and 2) the sport position is pushing the parallelogram rearwards with lighter weight on the spring, hence less preload (same spring rate in both seatposts).
On my Rad Rover, which is an upright riding position, the NCX is bouncier and requires more preload to smooth out. However, it's not so bouncy that it throws me around, just bobbed more than I cared for. But once preload is set, it was a smooth ride, and only the most egregious hits caused any bobbing (talking 4" diameter exposed tree roots).
On my Vado, which is more of an active/sport riding position, the NCX with slight preload is extremely smooth and predictable. I also flipped the top mount around to negate the inherent rearward offset of the NCX (see: https://electricbikereview.com/forums/threads/whats-not-said-about-suntour-ncx-seatpost.48561/)
Not a mechanical engineer or anything, but it seems to this novice that when rider weight is positioned directly above the parallelogram, you wind up with 1) duh, more weight directly on the spring (increasing the need for preload or a heavier spring rate if beyond the parameters of the stock spring) and 2) the sport position is pushing the parallelogram rearwards with lighter weight on the spring, hence less preload (same spring rate in both seatposts).