Trek rail rear shock upgrade ideas please

[Stray cat]

I set up a Fox DPX2 on my Rail 7. I weight 210lb and for a 30% sag,had to put 300 psi and I feel it too soft.

Anyone else in the same situation? Not sure if 300 psi is the max pressure accepted. Shock is 2020 version. Thanks

 

[Iggy_BBR]

I set up a Fox DPX2 on my Rail 7. I weight 210lb and for a 30% sag,had to put 300 psi and I feel it too soft.

Anyone else in the same situation? Not sure if 300 psi is the max pressure accepted. Shock is 2020 version. Thanks

Dont have a DPX2, but I would try bumping up to 25% sag and/or slowing the rebound down.

Here's what's in the Fox manual:

https://www.ridefox.com/dl/bike/605-00-159-FLOAT-DPX2-Tuning-Guide-white-revA.pdf

Additional tuning options Volume Spacers
Changing volume spacers in the shock is an internal adjustment that allows you to change the amount of mid stroke and bottom out resistance.
If you have set your sag correctly and are using full travel (bottoming out) too easily, then you could install a larger spacer to increase bottom out resistance.
If you have set your sag correctly and are not using full travel, then you could install a smaller spacer to decrease bottom out resistance.

 

[Stray cat]

Dont have a DPX2, but I would try bumping up to 25% sag and/or slowing the rebound down.

Here's what's in the Fox manual:

https://www.ridefox.com/dl/bike/605-00-159-FLOAT-DPX2-Tuning-Guide-white-revA.pdf

Additional tuning options Volume Spacers
Changing volume spacers in the shock is an internal adjustment that allows you to change the amount of mid stroke and bottom out resistance.
If you have set your sag correctly and are using full travel (bottoming out) too easily, then you could install a larger spacer to increase bottom out resistance.
If you have set your sag correctly and are not using full travel, then you could install a smaller spacer to decrease bottom out resistance.

Thanks. I think it’s a problem of first and mid stroke support,not bottoming out jumping mid size features. Can’t add more pressure,I am in 300psi and it’s the limit for my pump.
I’ll try with a bigger volume spacer,I thinks it affects final stroke but first and mid stroke too.

 

[Slapbassmunky]

Check what spacers are in the negative chamber, it sounds like the negative volume is too big forcing you to overcompensate with air pressure in order to get the correct sag.

 

[Iggy_BBR]

Thanks. I think it’s a problem of first and mid stroke support,not bottoming out jumping mid size features. Can’t add more pressure,I am in 300psi and it’s the limit for my pump.
I’ll try with a bigger volume spacer,I thinks it affects final stroke but first and mid stroke too.

Yes the volume will affected the overall feel from my experience, putting more volume spacer should drop the pressure needed in the shock and it will feel stiffer. If you close to max at weight, sounds like you would need the extra spacers. Also dont forget to equalize the positive and negative air pressure, from empty pump in 50lbs of air and then cycle teh shock a few times. Pump it again with 50lbs and cycle it again till you get to your desired sag setting.

Remember while setting the sag to reset the rebound and compression to open. After the sag is set, to closed the rebound and turn to
recommended settings and adjust from there.

 

[Stray cat]

Apart from that,really happy with the shock. Is what I was looking for. A plusher feeling but with enough support,similar to a X2 I run on other bikes
It’s way better than stock one and matchs really well with the Rail system. I wanted to try a coil,but I’ll give Fox DPX2 a try
Have to fine tuning it and play with pressure and tokens.

 

[Doomanic]

First run with the progressive spring on my Jade X today. Seemed to work really well, but to be honest I wasn't unhappy with the linear rate spring I had on before.

 

[BiGJZ74]

Added a 230x65mm 21' Fox DHX2 to my Rail 7. Feels amazing and at this stroke....not to linear.

 

[Nick69]

First run with the progressive spring on my Jade X today. Seemed to work really well, but to be honest I wasn't unhappy with the linear rate spring I had on before.

I'm planning on fitting Jade X 's to our medium Rails but I'm undecided to go with the normal springs or pay more for the progressive ones...
Did you notice much improvement..?

 

[Doomanic]

It's early days and I haven't hit anything big yet. I've had to back off how much I'm compressing into jumps and I need to have a play with the rebound damping.

 

[Nick69]

It's early days and I haven't hit anything big yet. I've had to back off how much I'm compressing into jumps and I need to have a play with the rebound damping.

I've been offered a Jade X 230 x 65... Is it the same as a 230 x 57.5 or 60 just with no spring clips...? Therefore easily reduced with them too..?

 

[Iggy_BBR]

I've been offered a Jade X 230 x 65... Is it the same as a 230 x 57.5 or 60 just with no spring clips...? Therefore easily reduced with them too..?

What matters is the "eye to eye" 230mm measurement the stroke can be reduce to the required 57.5mm with a 7.5mm spring clip spacer.

Spring Clip Jade/Jade X – DVO Suspension

dvosuspension.com

 

[BiGJZ74]

I've been offered a Jade X 230 x 65... Is it the same as a 230 x 57.5 or 60 just with no spring clips...? Therefore easily reduced with them too..?

Yes, 230x57.5 is really a 65mm stroke shock spaced down to 57.5mm

 

[Nick69]

Thanks for the replies. I'm sure I've also read somewhere that I can use the original mounting hardware from the Rockshox Deluxe on my Rail 5 too...?

 

[BiGJZ74]

Thanks for the replies. I'm sure I've also read somewhere that I can use the original mounting hardware from the Rockshox Deluxe on my Rail 5 too...?

To use the RS hardware on the Fox Shock, you have to remove the Fox Igus bushings and use the RS hardware including DU bushings.

 

[Nick69]

To use the RS hardware on the Fox Shock, you have to remove the Fox Igus bushings and use the RS hardware including DU bushings.

It's the Dvo Jade X I'm looking at, don't think I can afford two Fox DHX2's... ?

 

[BiGJZ74]

It's the Dvo Jade X I'm looking at, don't think I can afford two Fox DHX2's... ?

Same would work for the DVO...DVO same hardware

 

[MTB565]

Quick one. I think it's already settled in the thread but will a Trek Rail size Large work with a 60mm stroke instead of 57.5 without any further modifications? And what would be the actual rear travel with 60mm stroke?

 

[Gutch]

View attachment 57513

Nice. Are any of you guys around the 215# mark kitted and hit some big stuff? I’m concerned the Trek is pretty linear for the coil? I maybe wrong, but want to make sure if I purchase one.

 

[Bomble]

Quick one. I think it's already settled in the thread but will a Trek Rail size Large work with a 60mm stroke instead of 57.5 without any further modifications? And what would be the actual rear travel with 60mm stroke?

Mine is a 60 stroke as recommended by tftuned. No idea about the actual travel though.

 

[MTB565]

Mine is a 60 stroke as recommended by tftuned. No idea about the actual travel though.

Nice, thank you.

 

[Doomanic]

60mm stroke is 157mm travel. I run 60mm on my medium Rail and it's fine.

65mm stroke would be 171mm travel but you'd need to check for clearance around the rocker arm and set tube at full compression as well as checking the reservoir/downtube clearance too.

 

[MTB565]

60mm stroke is 157mm travel. I run 60mm on my medium Rail and it's fine.

65mm stroke would be 171mm travel but you'd need to check for clearance around the rocker arm and set tube at full compression as well as checking the reservoir/downtube clearance too.

So basically 160/160, sounds awsome. Any known reasons Trek choose the 150 travel route? Or is the biken not "balanced" with the 157/160 setup?

 

[Doomanic]

Extra travel on the rear adds it at the end of the stroke so you'll only notice it on big hits.

I'm running 170 on the front.

 

[MTB565]

Extra travel on the rear adds it at the end of the stroke so you'll only notice it on big hits.

I'm running 170 on the front.

Yes of course, I just dont see any downside to the increased travel in the back. Thanks for clarification anyways! ?

 

[Stray cat]

And what spring size are you running?

 

[Doomanic]

65mm progressive or 69mm linear. Both Cane Creek.

The 65mm is only just long enough on the Jade X

 

[Doomanic]

I just dont see any downside to the increased travel in the back.

More chance of pedal strikes or clattering the bash guard on heavy landings.

 

[magic82]

Hi guys, i have a doubt i bought a DHX2 shock with 500lbs of the spring. My total weight is 85kg and i changed the spring to 550lbs but i'm not sure that it is enough to avoid bottom out, can you help me? i' m open to receive your suggestions
Many thanks

 

[Doomanic]

Have you checked the sag?