Just picked up a used '07 Izimu frame that I built up with a Totem as my DH/FR bike. It's in addition to my Titus El Guapo, which is the "pedal" bike. The Morewood came with a Manitou Revox coil shock with a Ti spring (no markings, unknown weight).
I'm 6'2" and roughly 205 in gear. I ride technical rocky stuff in Arizona. Here's a pic of the build prior to today's first shuttle runs:
The bike was incredible (BTW, this is my first DH bike). Stiff frame, not too heavy, pedalled surprisingly well, very poppy and flickable. Got a total of three runs in (twice down Geronimo and once down Holbert if you happen to be familiar with South Mountain in Phoenix).
My issue is the rear shock. Just seated and riding around it feels great and I'm getting about 30% sag. On the trail however, I'm getting a solid "thunk" or "thud" from the rear shock on impact (from drops, jumps, etc.) I can't tell if it's from the initial impact (I suspect so) or from the shock rebound.
Everything is tight and I'm not getting any unusual or "broken" noises otherwise. I began with all high- and low-speed compression dialed out, the rebound just a bit back from full fast, the bottom-out setting on "2" and about 140 psi in the air chamber.
After each run, I added some slight low- and high-speed compression and slowed the rebound. Had no affect on the "thud". I suspect I'm bottoming the shock out on these hits, but I can't really tell and it's hard to re-create the scenario other than on the trail.
Any thoughts or input to solve the problem?
I'm 6'2" and roughly 205 in gear. I ride technical rocky stuff in Arizona. Here's a pic of the build prior to today's first shuttle runs:
The bike was incredible (BTW, this is my first DH bike). Stiff frame, not too heavy, pedalled surprisingly well, very poppy and flickable. Got a total of three runs in (twice down Geronimo and once down Holbert if you happen to be familiar with South Mountain in Phoenix).
My issue is the rear shock. Just seated and riding around it feels great and I'm getting about 30% sag. On the trail however, I'm getting a solid "thunk" or "thud" from the rear shock on impact (from drops, jumps, etc.) I can't tell if it's from the initial impact (I suspect so) or from the shock rebound.
Everything is tight and I'm not getting any unusual or "broken" noises otherwise. I began with all high- and low-speed compression dialed out, the rebound just a bit back from full fast, the bottom-out setting on "2" and about 140 psi in the air chamber.
After each run, I added some slight low- and high-speed compression and slowed the rebound. Had no affect on the "thud". I suspect I'm bottoming the shock out on these hits, but I can't really tell and it's hard to re-create the scenario other than on the trail.
Any thoughts or input to solve the problem?
