[Closed] Struggling with Fox DPX2 setup

Sag on the rear is set when sitting on the seat. The DPX2 runs fairly high pressures so unless you're a pixie 220psi/33% sounds ok.

Sag on the rear is set when sitting on the seat. 

Really? That contradicts, well, everyone!

I've always done it sat down.

If I set it sittng on the seat I reckon it wouldn't be far off but as Hob Nob I've always set it in the "attack position"

I set mine sitting on the saddle, 30% at that way so I reckon you still need a few more psi.

Its nigh on impossible (IMHO) to set it accurately on the back without sitting down. Even the fox vidyo shows the chap sitting before he dismounts which of course would blow away anything he'd done before in the attack position. Set the rear to 25-30% seated, feet off the ground, front the same in attack position. Remember to wind off all damping and platform settings to their minimum before you start and you should be good..... Depending on the frame design (slacker seat angles especially) I'd expect to have to mess about finding the right amount of sag as there's no correct number but something in the 25-30% range is probably good.

30% sat down always works for me - at least as a start point...

Sag on the rear is set when sitting on the seat.

My entire life up until this point has been a lie.....!

I found the the LSC to be very effective at tuning the ride on the dpx2

Dpx2 manual is pretty good for starting point

But yeah sag set when sitting down is how it's done

Thanks for the replies, looks like setting the sag seated is the future 🙂

cheers

Could notget mine on orange alpine set how I wanted it. to get 30% sag I had 275 psi. Then could not get much travel out of it. Tf tuned recommend spacers in the negative side which did help but not perfect. Changed it to a canecreek db inline coil. Sorted. Wished I'd done it sooner.

I’m having a bit of trouble setting up my DPX2 shock on my Cube Stereo TM 140.It’s a 2019 DHX2 factory with a 3 position LSC with extra LSC when fully open and HSR (i think?) I’m around 180lbs

From memory, Cube Stereo has quite a linear, or possibly slightly regressive suspension curve. Fox DPX2's usually come with a 0.2 spacer in stock, I'd suggest trying a 0.4 or even a 0.6 spacer in there to reduce the air spring volume, and get it so you can run the desired 25% sag without bottoming out all the time.

It's LSR by the way, NOT HSR on the DPX2, just as it is on just about every shock on the market aside from the Fox X2 which has both.

I found the the LSC to be very effective at tuning the ride on the dpx2

I found it to be almost too effective, I started to feel like there was too much of a trade off in small bump sensitivity with even just 2 or 3 clicks added from fully open on mine. Have since changed to a Float X2 and there's a lot more scope for adjustment on that shock.

Same story with my Pivot, leverage curve is not progressive. Had to use the largest permitted spacer to get the right sag and small bump compliance without bottoming out.

I've already changed the spacer from 0.2 to 0.4. Max I can fit is 0.6 so might give that a try depending how I get on with my seated sag setting.

So my adjustment on this shock is for LSC (firm, medium and open plus 10 clicks in open) and LSR?

I though the rebound was high speed which may be why sussmybike keep telling me I needed more HSC, (you have to tell SMB which setting are adjustable on your shock)

I though the rebound was high speed which may be why sussmybike keep telling me I needed more HSC

If there's only one rebound adjuster on ANY shock, it's LSR... HSR is always factory preset, can be adjusted interally with shims by someone who knows what they're doing if you need though.

It's why I love the Float X2. All the adjustments are there externally, and every click makes a noticeable difference!

I’ve already changed the spacer from 0.2 to 0.4. Max I can fit is 0.6 so might give that a try depending how I get on with my seated sag setting.

In my opinion, the shock manufacturers have got a little carried away with trying to make their shocks feel too linear and "coil like" to the point where on anything but the most progressive linkage frames, they need filling full of spacers to provide some kind of progression. Just about every motorbike on the road (or off) has a very progressive leverage curve to the rear suspension, most MTB's don't. In fact most MTB's are quite linear, or even digressive, which means they need some kind of natural ramp up in the shock to get over this.

Also, this...

Sag on the rear is set when sitting on the seat. The DPX2 runs fairly high pressures so unless you’re a pixie 220psi/33% sounds ok.

I'm around 14st and was running something like 280psi in the DPX2 I had on my Starling Murmur, which has a 2.5:1 leverage ratio. That was with the 0.8 spacer fitted too...

motorbike on the road (or off)

KTM 450

First 150mm of travel is 3:1

next 150-225mm is 2.5:1

next 225-275mm is 2.25:1

next 275-330mm is 2.1:1

So quite comparable to a lot of progressive mtb designs.

Remember, mtb suspension doesn't have to cope with the weight of a 450 Mx bike and MX sized jumps (unless it's the red bull hardline).