How to make single pivot suspension more progressive?

Hey!

I'm designing a single pivot frame with my buddy for myself.

It will be a ~150mm enduro using a 210x50 or 55 rear shock, most likely air. His previous design is similar to Marino's, but I've heard they are regressive and designed around progressive air shocks.

I'm a big dude (~100 kg), while he's much smaller (~65 kg). I like a bit of progression and I think I will need it, since I weigh a lot. I also don't really like packing my shock full of tokens and ruining mid stroke support to gain a bit of bottom out resistance. Compression is my friend, I know, but cheap shocks may have a shitty compression adjustment range, or lack that. Therefore I'd like to work around it.

So, what determines a frame's progressivity in a single pivot layout, with no rockers or other links? One thing I've heard is to angle the shock downward (like Guerilla Gravity did), or place the pivot point forward of the bottom of the shock's stroke. Basically the shock's lower pivot never getting past perpendicular with the main pivot. Is this true? Any tips?

Thank you, Patrik

PFA, I'd like something similar. Geo numbers are set, but different from this.

Hey!

I'm designing a single pivot frame with my buddy for myself.

It will be a ~150mm enduro using a 210x50 or 55 rear shock, most likely air. His previous design is similar to Marino's, but I've heard they are regressive and designed around progressive air shocks.

I'm a big dude (~100 kg), while he's much smaller (~65 kg). I like a bit of progression and I think I will need it, since I weigh a lot. I also don't really like packing my shock full of tokens and ruining mid stroke support to gain a bit of bottom out resistance. Compression is my friend, I know, but cheap shocks may have a shitty compression adjustment range, or lack that. Therefore I'd like to work around it.

So, what determines a frame's progressivity in a single pivot layout, with no rockers or other links? One thing I've heard is to angle the shock downward (like Guerilla Gravity did), or place the pivot point forward of the bottom of the shock's stroke. Basically the shock's lower pivot never getting past perpendicular with the main pivot. Is this true? Any tips?

Thank you, Patrik

PFA, I'd like something similar. Geo numbers are set, but different from this.