It's a big air chamber.
First test day was at Thunder Mountain. There's a trail that's more XC single track down the mountain, old school New England style. I used that rather than the bigger faster stuff. Second day was a more XC trail network but I chose a up/down loop for the laps to get consistent reads. I guess I'm not actually complaining, just a bit perplexed.You mention "laps", does that mean at the bike park? Body position will affect the weighting of the bike and subsequently the fork and so if you have a very rear-biased riding position, like that at a DH park, the SW may be interpreting that lack of weight over the fork in it readings thus recommending the unusually low reading. I too tuned my 38 at the park and got some fairly low PSI suggestions, but it works since it suits the way this bike is ridden. Contrast that to my XC/trail bike where i'm adding more psi than the manual suggests since i'm constantly situated over the bars on that bike.
For me, running the Zeb at RS’ recommended pressure resulted in support I was happy with, but the fork just sat too high. I like my fork a bit more settled into its travel to hold the trail. I was also struggling a bit with staying on top of the front wheel in corners on my slack bike, and the high ride wasn’t helping.Some people here must have some poorly functioning shock pumps or never leave the ground...
These are the issues I've been messing with. The Luftkappe sounds like a good solution. Thanks for sharing your experience!For me, running the Zeb at RS’ recommended pressure resulted in support I was happy with, but the fork just sat too high. I like my fork a bit more settled into its travel to hold the trail. I was also struggling a bit with staying on top of the front wheel in corners on my slack bike, and the high ride wasn’t helping.
Going softer definitely resulted in sub-optimal support, but I preferred it mainly for geometry reasons. On bigger hits, the Zeb does a good job of not bottoming hard, in spite of the reduced spring rate.
As I said, the Luftkappe has addressed my issues. The fork settles into its travel more off the top but then provides good mid-stroke support. I no longer need to run the fork under-sprung.
Yeah there is enough clearance for the air to get through, absolutely do NOT run your air piston any less than the factory torqueHey everyone. Thanks for all the responses! OK, so answers to your questions:
Fox Digi pump, that correlates to the Shock Wiz which is also digi.
I started with the stock one spacer, and SRAM suggested settings. That was harsh. Shock Wiz also said release a lot of pressure.
As I aired down over laps, I added a second spacer. Things started to feel better and the Wiz reports got better too.
Finally got my Wiz score into the 80's but it kept suggesting another spacer, so I added a third. Settled on the current 34psi and 3 spacers.
When my Lyrik was stock, I ran 2 spacers and 50psi. That felt great and Wiz said it was perfect. When I upgraded to the 2021 damper and spring, I had to lower pressure to 43 to get the same results.
Yes, I pulled the Zeb apart last night to confirm oil/lube which I know can be wonky from factory. I became an anal retentive pro at that over the years with my Lyrik and a Pike on another bike. Happy to report it was basically perfect from the factory, but still cleaned, regreased, reinstalled spring, new 20ml 0w30, etc.
Here's a weird thing. Another guy I've spoken to said he discovered there is a hole on the red plastic head that aligns with one of two holes on the metal shaft. It seems to allow the hollow shaft area to add to negative spring volume. But from factory it is not aligned. Mine was not aligned but loosening it slightly lined it up. However, I didn't like that it was not torqued properly. So me and a friend who owns a shop called SRAM. Third level of support, the top suspension guru guy, stated that it had no effect at all. Didn't equivocate at all. Totally said it has no effect. So I erred on the side of caution and torqued correctly with the hole covered up.
This is on a 2017 Specialized Enduro, all stock form other than the now new Zeb.