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SRAM RockShox Super Deluxe Air Pressure

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SRAM RockShox Super Deluxe Air Pressure

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flag tonemtb
Posted: Dec 21, 2021 at 8:14 Quote
Hi,

Q1 - Air Pressure
I have a SRAM RockShox Super Deluxe Rear shock (trunion mount) 205 x 62.5.

This was to be an upgrade on my Giant Trance running a Fox DPS Float shock.

I'm about 65kg (without trail gear, so around 140 pounds).

Checking SRAM guides/videos it states to set the air pressure at 100PSI and cycle the shock a few times and then pump it to desired pressure for rider weight.
However even at 100 PSI the shock doesn't move at all, yes I have checked the lockout etc and ensure it is in the correct position (fully open).

I dropped the air pressure further down to 50PSI and could get the shock to move maybe 1mm.

I have removed the shock from the bike and put the Fox back in. Removing all the air from the RockShox Super Deluxe via the top air valve and ensuring the speed return is set to fast I can only just about compress the shock with my body weight pressing through the shock against the floor.

This doesn't seem normal as with zero air I was expecting to be able to move this freely with just my arm strength. Anyone got any ideas about how to go about resolving this or even some hints / tricks to try??


Q2 - knocking Sound

I have also read about the "Super Deluxe Knocking issue" and with the shock removed from the bike rotating it 180 degrees you can hear something moving inside and it coming to a stop (with a slight knock noise)
SRAM RockShox Super Deluxe Knocking Sound

by tonemtb
Views: 484    Faves: 0    Comments: 0


so IFP maybe ?? but seem too loud if the IFP is anything like those in a Reverb Seat Post so counter measure is a possibility.

Anyone know how to resolve this without a trip to the LBS - SRAM Warranty, is it something a home mechanic can undertake?

https://www.servicearchive.sram.com/sites/default/files/techdocs/gen0000000005131_rev_a_2017_super_deluxe_50-200_hour_service_manual.pdf

Or

https://www.sram.com/globalassets/document-hierarchy/service-manuals/rockshox/rear-suspension/2018-2022-super-deluxe-service-manual-english.pdf
flag ThEGr33k
Posted: Dec 27, 2021 at 17:18 Quote
Q1. The IFP has pressurised air in it, that stops oil from cavitation. You'll still be pushing against this.

Q2. This seems to be a common issue (poor design from RS) with the spacer that reduces travel, in our case from 65mm to 62.5mm, moving up and down the shaft Internally. You can see this spacer easily within the air can. It should be held tight to one end with a rubber O ring (my RS!?) but the O-ring isn't tight enough.

A question for you... Do you hear the knocking when you're riding? Mine knocks and sounds horrible sometimes.
flag tonemtb
Posted: Dec 30, 2021 at 7:17 Quote
Hi,

I haven't been able to ride with the shock in place as I can't get the shock to move with my limited body weight when at an appropriate PSI.

I'm a bit loathed to start pulling it to pieces as I could just return it, but if it was something easy then I'll happily undertake maintenance.

It seems to be in the main body so likely the "spacer" you refer to in the main Air Can.
RockShox Super Deluxe exploded view
RockShox Super Deluxe exploded view

Rockshox Super Deluxe Bottomless Tokens
RockShox Super Deluxe Bottomless Tokens


Similar to this issue maybe (which appears to be what you mentioned)?


Looks like simple fix with a better O Ring (one from Fox has been mentioned in the comments of the video)
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