2018 Altitude DPX2 Air Pressure- Mtbr.com
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  1. #1
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    2018 Altitude DPX2 Air Pressure

    I picked up a 2018 Altitude towards the end of the last northern summer. The bike absolutely rips but I have noticed that the rear shock (DPX2) requires a ton of air to achieve 30% sag. I am currently running it at around 300psi for my 200lbs riding weight. Both chambers have been correctly equalized during setup and the shock feels fine, I just want to make sure there isn't something wrong with the shock. I have confirmed the pressure with 2 shock pumps and even used a ShockWiz on it.

    I should also mention that the Ride9 is set in neutral (position 5) and I am not currently running any volume spacers - considering tinkering with both.

    Anyone else needing very high pressure with a DPX2 on an Altitude?

    Thanks folks
    Last edited by Boofhead; 02-27-2019 at 02:34 PM.

  2. #2
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    Can't answer for the Altitude or DPX2 specifically, but since going to a Corset air can on my THunderbolt and an EVOL can on the Float X on my Altitude, I've needed to add about 80 psi. So at 165 lbs. I'm running ~ 200 psi on both bikes, which I think is about par for the course.

    Are you setting to 300 psi based on sag or on reaching end of travel?

  3. #3
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    I was expecting to run more pressure with the DPX2 but was a bit surprised when it got up near 300psi. I'm still quite a bit under the max of 350psi but I've just never run anything near that high. Just want to be sure there isn't something wrong with the shock. I'm going into my LBS this weekend so I'll take it in just for some peace of mind.

    I am setting the shock at around a 30% sag. I have only reached full travel at that pressure once and that was off a poorly landed 3 foot drop. Hence the not using any volume spacers yet.


    Thanks for your reply Eric

  4. #4
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    Yeah, Altitude frame takes a high spring rate. I'm 185lbs out of the shower and my pump read 250lbs to hit 30% sag using a DPS. That's much higher than any other similar frame I've had in the last few years.

  5. #5
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    Thanks very much. Seems all is good

  6. #6
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    Just to add....I recently replaced the stock CTD shock on my 2013 Instinct with a DPS Evol. On the CTD, I ran about 190 psi (I'm 240 lbs) and I am at about 290 psi on my DPS (although I'm still tinkering as it is new). My local bike shop told me to expect to run a lot more pressure because of the larger negative chamber.

    I don't recall what the Ride 9 numbers are, but I am one space lower (for heavy riders) and one spot slacker than the centerline.

  7. #7
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    Yes, CTD and DPS are a different story. DPS was a huge step forward.
    ​Rocky Mountain Thunderbolt 2016 Custom Built

  8. #8
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    I'm trying to dial in the DPX2 on my new '19 Altitude C50. I'm 180lbs without riding gear (probably 190lb with) and bottomed out a few times on little 1-2ft drops. Checked the shock and it had 200psi from the shop. With shock fully extended, it measures 51mm. Rocky Mtn said it should have 30% sag which is around 15mm. I kept adding 20psi and cycling it up till I reached 300psi (max of my pump) and I still have 17mm/33% sag. If I still have bottom out issues, do I need to add a token and/or go over 300psi?

    This is what the Fox site says about the shock:
    2019, FLOAT DPX2, P-S, A, 3pos, Evol LV, Rocky Mountain, Altitude Carbon 50 C2, 210, 55, 0.2 Spacer, CM, DRM, Rezi M F F, YS-7319/YS-7319 Logo

  9. #9
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    I'm 140 lbs and rode my Altitude with 195 psi in the dpx2

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