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Yes...these are the FOX part numbers for the traditional eyelet type shock mounts that fit the Rail. If your Rail originally came with the trunnion type shock, you’ll also need these items from Trek: • upper axle - 599898 • lower axle - 599900

I’d personally pass on the Zeb with the Charger R. The only time I think I’d recommend it is to someone who wants the very least to play with as far as setup, being that the damper only features an adjustment for rebound. I’m a fan of the GRIP2 damper found in some of the FOX forks, but I like...

The stock set on the 2021 Powerfly 4 looks to be the FSA CK-220 in 165mm. If so, they're cheap. I bought a 160mm set and didn't have much trouble tracking them down in the US at the time. Nowadays, and in a different country, it might be a different story. The FSA part number for the 165mm...

The E-Bike version of the FOX 36 is limited to 160mm travel. They use a different air shaft assembly than the standard 36. For 2019 & 2020, the E-Bike 36 used the same part number as the 34. For 2021, it’s a different part number but still tops out at 160mm.

Slight correction: it’s ABP (Active Braking Pivot) For coil springs on my Marino and Trek, I used the single pivot number generated by TF Tuned as guidance and it was accurate. However, my spring choice for each was the Cane Creek Valt progressive rate. With a tradition spring, I’d need to move...

My Marino frame is another example of a single pivot design. All of my Trek full suspension frames are examples of linkage driven single pivot designs. None of my Trek full suspension frames are examples of a true 4-bar design.

But that's not correct. Trek currently uses a linkage driven single pivot design that some might refer to as faux-bar but it's not 4-bar.

Hoping a speedy recovery for you @Nick790 ! It's rare I wear a fullface, but when I do, it's with goggles. I did just order two of the Smith Mainline helmets so maybe I'll use them on a more regular basis going forward. Regardless, with an open helmet, I always match it up with a Smith...

I was picturing the lower seat on my Cane Creek shocks as I’m sure they do have an effect on bumper position. Sorry that doesn’t apply here.

The lower spring seat isn’t in place on the shock. That will likely move the bottom out bumper up the shaft and may provide the addition space needed at the downtube. Give it a try with the spring seat installed.

As expected, @Offset nailed the explanation so I’ve got nothing to add. And BTW, offsetbushings.com make top notch stuff. I’ve only ever used them once but it was for a special project and were the only solution to make things work for my specific build.

You either need to completely remove and reuse the hardware, including eyelet bushings, from the stock RockShox shock or purchase new kits from FOX for the Bomber CR. If you’re looking to source the FOX kits, the following parts numbers might be useful: • Upper: 10mm x 54mm 803-03-311 • Lower...

Keep in mind this is a Powerfly and not a Rail.

I looked at Trek diagrams and then talked to a gentleman at FOX. The part numbers above are what I ordered for the Rail and I believe these are the newest design for the hardware. There may be other part numbers out there that are for an older version of the hardware kits but are still possibly...

Upper: 10mm x 54mm 803-03-311 Lower: 10mm x 40mm 803-03-329

Where did you get this info? I ask since the RockShox Technical Specifications show the difference for Axle to Crown, at same travel and wheel size, with ZEB being (only) 5mm longer than Yari/Lyrik.

Your Sam2 has frame-specific adaptors for the two different dropout settings:

There are two stock shock design specs for the Rail: standard eyelet 230x57.5 and trunnion 230x57.5. The trunnion mount option from Trek has the Thru Shaft. The Thru Shaft shock is a yoke added to a trunnion 205x57.5 Metric shock, making it 230mm in overall length. What @Slapbassmunky (or...