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: 10mm x 40mm 803-03-329
I’d suggest fitting the Bomber CR first without spring so it can be fully compressed with ease, to confirm proper clearance between the piggyback and the downtube. My feeling is there will be contact prior to full compression, but that is only a guess.
Cheers, mate!!
Really useful.
By "including eyelet bushings" you mean, that this is one single part axle and bushing? That's the reason why it wouldn't move?
For my understanding: Outside diameter of this axle-bushing part is somewhat "standard size" and will fit the Bomber's eyelet but the only option to replace the bushing or switch to the "new" bushings is to change all the parts? - Does this also apply to all the spacers or do I reuse these in any case?
Essentially..
You have the hole at each end of the shock, this is known as the 'shock eyelet'. This will be 15mm in diameter.
Within that, you have a thin bush known as a 'DU bushing', this has an internal diameter of 12.7mm and is a wearable item which stops the actual shock from wearing.
Within that, you have the shock bushing or 'mounting hardware' etc. These come in many different widths depending on the bike. This is what the 54mm / 40mm sizes are and in this case they have a 10mm hole. This is also a wearable item.
Now to explain the spacer and DU bush issue you're having..
There are two types of DU bush, a one piece part which is what we sell DU Bush and a two piece part that comes on Fox shocks amongst some other brands. The two piece part has a lip on either side - this lip then means you need narrower spacers than if you have a DU bush such as ours.
So, if you have a set of spacers that are designed for a one piece DU bush you cannot use them with a Fox two piece DU bush as they are too wide. The same goes for the opposite combination.
Our kits are designed for a one piece DU bush and include spacers to fit this.
Hope that helps chaps!
As expected, @Offset nailed the explanation so I’ve got nothing to add.Cheers, mate!!
Really useful.
By "including eyelet bushings" you mean, that this is one single part axle and bushing? That's the reason why it wouldn't move?
Thanks mate!
I think even I got it now ?.
So with the plastic Fox "tool-free" bushings I'd need new spacers. Since top and bottom mounts have different spacers on stock configuration (actually 2x2 on each end) and as far as I can tell the Fox kits only come with one pair of spacers, these won't ever fit.
So with your solution I'd need a pair of standard bushings for my frame, a pair of DU bushes and the tool to get the single old DU bush out, right? Spacers can be reused since space between shock and frame won't change and the stock screw/axle will fit the new bushing's inner diameter so these can be reused as well?
I think I'll go with your product then, great support!
How long does shipping to Germany approximately take in the post Brexit era? ?
Edit:
One more question: When I removed the shock I checked the bearings and noticed the lower ones not rotating smoothly anymore. I can feel some kind of rattle compared to the upper bearings. I think they gotta be replaced. Do you offer any smart solutions to get bearings in and out as well?
Max compression possible (bumper):
View attachment 52951
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.
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.Unfortunately this has no effect.
The lower spring seat has a larger inner diameter and doesn't sit directly on the shock shaft.
Yes...these are the FOX part numbers for the traditional eyelet type shock mounts that fit the Rail.I have bought a Fox DHX2 2018 for my trek rail 9 alluminium, I have a question now:
which hardaware kit bushing need?
these parts are OK
• Upper: 10mm x 54mm 803-03-311
• Lower: 10mm x 40mm 803-03-329
Could you help to me?
Thanks
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
View attachment 53752
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
View attachment 53752
No.Hi. I’d like to mount a Fox DPX2 on a Rail 7,standard shock mount. Can’t find Fox hardware. Would it be this right? Thanks
View attachment 53810
Sure, RockShox hardware can be used in a FOX shock, with the addition of eyelet bushings being required items to make it compatible. Beyond that, the kit you’ve referenced is for a Session frame that has an offset design; the Rail does NOT use an offset.Ok. I thought someone said,Fox and Rock Shox hardware were compatible.
Hi Coregrind,Sure, RockShox hardware can be used in a FOX shock, with the addition of eyelet bushings being required items to make it compatible. Beyond that, the kit you’ve referenced is for a Session frame that has an offset design; the Rail does NOT use an offset.
I have experience with shock fitting on the carbon Rail frame. It is not offset. For the aluminum frame, it’s been suggested previously that it is also not offset.Hi Coregrind,
Are you sure that the rail does not use an offset? I ask this because my rear shock in the bottom side have offset
The shock on my non-Trunnion Rail 7 is not offset. I am absolutely certain of this, not only because I've looked, but because I have changed the shock and had to modify the spacers which involved using a vernier.
What stroke DHX2 did you run? I'm looking to run a 230x65mm. I currently have a 230x65mm DPX2 installed but want to run Coil like my regular bikesWent and pulled the trigger on a 2021 DHX2... Just waiting on a Cane Creek Progressive coil spring to arrive... #stoked
View attachment 40954
What stroke DHX2 did you run? I'm looking to run a 230x65mm. I currently have a 230x65mm DPX2 installed but want to run Coil like my regular bikes
I was definitely looking for a 2021but hoping 65mm would fit. I guess i'll stick with my 230x65 DPX2 for now. Thanks for the infoDepends. Pre '21 MY shocks I don't think you will fit anything longer than the stock 57.5mm as the piggyback is really long. I tried one with a bit of tape to test for marks & it 'just' kissed on a hard bottom out.
Float X2 '21 MY fits in 230x60, as the piggyback is shorter (but fatter so potentially contacts higher up the downtube). I would say it has ~2mm spare on hard bottom out. I wouldn't think you will get anything bigger on there.
All on a large frame for reference.
Details for Öhlins products (mainly TTX22 series shocks and suitable springs)Thank you for the question. We NEVER mounted our shock on Trek Rail. The problem comes from piggyback-frame incompatibility. So at the moment our shock doesn't fit the Rail.
Best regards - Cordiali saluti
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