Richiefromboston
Active member
I did pull white bushing didnt work at all
Trek Rail with Fox DHX2 coil
- Thread starter zaykay
- Start date
BiGJZ74
E*POWAH Master
Did they send the wrong hardware? I installed the same offset bushings kit and DHX2 shock. Removed the white pressed in the black DU bushings inserted the pin + sleeves, then used the Trek 10mm Shock axle/bolt to tighten it all up. Curious as to why it didn't work. At least you found a way to make it work. Bike looks great.
I have fox dhx2 mounted with all bushings and axle from Trek on upper side, so I have to change the blue plastic fox bushing only on the upper joint of shock.
For the bottom side I bought the original fox spacers (40mm?) and use the white bushing inside of shock and there is only axle by Trek, everything other on bottom is Fox.
All frame bearings and o-rings are original by Trek and remained in frame.
I couldn't get the spacers by Fox for upper side, so I have to keep the Trek one (for RockShox originaly) and had to change the white bushing on the upper side of new shock.
For the bottom side I bought the original fox spacers (40mm?) and use the white bushing inside of shock and there is only axle by Trek, everything other on bottom is Fox.
All frame bearings and o-rings are original by Trek and remained in frame.
I couldn't get the spacers by Fox for upper side, so I have to keep the Trek one (for RockShox originaly) and had to change the white bushing on the upper side of new shock.
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dixie600mhz
Active member
Is that 230x65? What length of spring did you end up getting? It looks like it takes up most of the available space. Do you mind sharing how much you weigh and what spring seems to work best?
BiGJZ74
E*POWAH Master
I run a 230x65mm DHX2, The Black steel springs are a lot longer than the SLS springs. I run a 67mm 700lb spring @ 300lbs, could even go to 650 as the 700lb spring was great even at 340lbs..
Our bushing kits for the Rail are designed to be used with our included DU bushes (the Fox ones come out easily with a flat head screwdriver and ours are pressed in with either a vice or our DU Tool which is available on our website). If you try to use it with the Fox DU, the spacers will be too wide.
If you'd like, we can produce them with narrower spacers to be used in conjunction with the Fox DU bushes, just specify this along with the frame and shock models when ordering when ordering these Shock Bushings | Trek Rail - it's not a problem.
We're always quicker via email if you have any questions, which you can find on our contact page.
Cheers guys!
Jeron @ Offset Bushings
If you'd like, we can produce them with narrower spacers to be used in conjunction with the Fox DU bushes, just specify this along with the frame and shock models when ordering when ordering these Shock Bushings | Trek Rail - it's not a problem.
We're always quicker via email if you have any questions, which you can find on our contact page.
Cheers guys!
Jeron @ Offset Bushings
300lbs including the bike? That's how I'm running a 650lbs spring (Rail 5 XL) and think it's pretty spot on.
It's another shock (Marzocchi Bomber CR) though.
BiGJZ74
E*POWAH Master
I wish….just me lol.
dixie600mhz
Active member
I weigh 195lbs but with full kit probably 210ish. I'm thinking of getting a 67mm fox SLS 550 spring? Should I try and find a 525 instead or even a 500? Thoughts? I like the bike super plush. Don't want to buy the wrong spring. The 550 is in stock at a few places. Can't find a 525 anywhere in the USA so far.
BiGJZ74
E*POWAH Master
are you running shock at 65mm stroke?
dixie600mhz
Active member
I was going to order the dhx2 as 230 x 65. Do I need to go with a longer spring? Is the rule of thumb max travel plus 8mm?
BiGJZ74
E*POWAH Master
I run a 67mm spring. Just run 1mm of preload. and ur fine. Shouldn't run more that that anyways. According to Fox Calculator, 550 may be way too much. I attached the calculator with a body weight of 210lbs in gear, shock stroke @ 65mm and rear travel of 169mm. For 30% sag ur probably at 425lbs according to the chart. It says 400 for 31%. If you jump or do medium to big drops you'd probably want to get a bit heavier with 450-500max. Tftuned's calculator said 466lb spring for 28% since that spring doesn't exist, 450lb would be the choice if you used their chart. If I had to guess based on the charts I'd go 450. Since the Rail isn't the most progressive system, you can probably err on the side of a stronger spring with softer settings on the shock. 550 if you really send it. I helped a guy on here who weighed 230lbs, 245-250 w gear, he went with 550 which was the fox recommendation for 250lbs and he said it was perfect.
The fox chart when I weighed 340 (355ibs in gear) said 700 which was perfect. I should probably drop my spring to 650 now but I've just opened up the compression and it still runs great
Fanatikbike.com has Fox SLS springs 2.65" (67mm) instock @ 450/475/500- Fanatik bike SLS 2.65"
thelostco.com has them in 475/500/550. thelostco.com Fox SLS 2.65"
BiGJZ74
E*POWAH Master
How much do you weigh? when calculating spring you don't add bike weight.
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dixie600mhz
Active member
Thanks dude. I'll buy you a beer next time you visit Austin!!
dixie600mhz
Active member
Finally finished the DHX2 install. 230x65 fits perfect. My total riding weight fully loaded is 215 lbs. After trying three springs I ended up with a fox SLS 475 spring to get sag at 32%.
With compression fully open I still haven't quite bottomed out with the 475, but sag was at least 36% using a 450 spring. First impressions after installing are that it felt like the rear tire is always super soft (but its not). Super plush ride. Tweaking compression and rebound after finding the ideal spring gets it really dialed in to feel great.
To help others, for my 2021 9.8XT Rail Trunnion Mount Rockshox Delux shock to DHX2 coil conversion I needed:
Trek Mounting pins: 599898 and 599900
FOX Bushing kit: 803-03-329 and 803-03-311
DHX2 2022: 630x65
FOX SLS Spring 475lb/inch 3.65"/67mm
I messed around with Sprindex and Fox SLS springs going from 450 up to 550. Can't say enough about Carl at Sprindex. He was awesome and sent extra springs to try at no charge. Also very helpful is the yo-yo for measuring sag and total travel. I'm running minimum preload possible (8 clicks). With a 450 spring I could get the sag down from ~36% to 33% using 24 clicks preload, but I noticed the small bump magic carpet smoothness was diminished significantly so went to a 475 spring setup.
It feels great. Can't believe how much a different rebound adjustments make!
With compression fully open I still haven't quite bottomed out with the 475, but sag was at least 36% using a 450 spring. First impressions after installing are that it felt like the rear tire is always super soft (but its not). Super plush ride. Tweaking compression and rebound after finding the ideal spring gets it really dialed in to feel great.
To help others, for my 2021 9.8XT Rail Trunnion Mount Rockshox Delux shock to DHX2 coil conversion I needed:
Trek Mounting pins: 599898 and 599900
FOX Bushing kit: 803-03-329 and 803-03-311
DHX2 2022: 630x65
FOX SLS Spring 475lb/inch 3.65"/67mm
I messed around with Sprindex and Fox SLS springs going from 450 up to 550. Can't say enough about Carl at Sprindex. He was awesome and sent extra springs to try at no charge. Also very helpful is the yo-yo for measuring sag and total travel. I'm running minimum preload possible (8 clicks). With a 450 spring I could get the sag down from ~36% to 33% using 24 clicks preload, but I noticed the small bump magic carpet smoothness was diminished significantly so went to a 475 spring setup.
It feels great. Can't believe how much a different rebound adjustments make!
BiGJZ74
E*POWAH Master
It is ridiculous how great the DHX2 feels on the Rail.
Richiefromboston
Active member
indeed it does, BUT I have what i can explain as Chatter going fast down hill Im "guessing" its because spring is too hard. sound right?
Richiefromboston
Active member
also does anyone make a Ti version of this spring listed above?
BiGJZ74
E*POWAH Master
could be a lot of things....settings, preload, rebound
- Thread starter
- #230
I think it's the Bosch motor freewheel which gives that sound.
- Thread starter
- #231
If that picture is taken with bottom out bumber still in place I'm afraid you don't have enough clearance for bottoming. I've had the understanding that in Large frame 62,5mm (for 2021 style reservoir, 60mm for older type dhx2) is the longest stroke which clears the frame. Is this XL frame?
BiGJZ74
E*POWAH Master
Thats the new resi and I jumped on my pedals without the spring installed and had zero contact
- Thread starter
- #233
I don't think that kind of test compresses the bottom out bumber fully. Have you bottomed out the shock yet in riding situation? So that you feel the metal clunk hard stop?
BiGJZ74
E*POWAH Master
I'm 340lbs....but yes...6ft huck to an ooops to flat bottom out without issue. Over 1000 miles and i'm fine.
Richiefromboston
Active member
Its not a sound its a vibration chatter you feel
dixie600mhz
Active member
I understand the concern. That pic was taken with the bump stop still in and no spring, bike fully loaded down. I was worried about it making contact so kept an eye on it. When I used a 450 spring and no damping, on some bigger jumps I was able to bottom out the shock completely (metal on metal feel). Inspection of the paint at that potential contact point remains untouched. So I believe that it's not hitting under worst case. I've switched to a 475 spring since and the bike feels magical. Haven't been able to bottom it out yet.
dixie600mhz
Active member
Yeah it's making me feel like that Zeb is the shittiest suspension I've ever had. Rear is plush and smooth. Zeb just can't do it for me. No matter what, I'm still getting wrist pump and numb hands. Don't get it on any of my other bikes.
Richiefromboston
Active member
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Which Zeb is it you have?
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