Marzocchi 55 CR – Any experience/thoughts?

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  • Marzocchi 55 CR – Any experience/thoughts?
  • hora
    Member

    Weirdly same here. Not buttery smooth on compression. Slight knotchiness- come to think of it sticky is right? Too.

    jaame, I also have the same problem with the rebound being too fast. I have already changed the oil to 10w. I presumed that with me being on the ‘larger’ side and running about 90psi (max on the weight chart is 100psi) that was the cause. I’d be very interested to hear how you get on with this. I may try going up to 15w oil to see if that helps – but the odd thing is initially the rebound was pretty much in the middle!

    Premier Icon wwaswas
    Subscriber

    Weirdly same here. Not buttery smooth on compression. Slight knotchiness- come to think of it sticky is right? Too.

    oh god, it’s started.

    There’s mass panic breaking out in a warehouse/office unit on the outskirts of Portsmouth as we speak.

    dbcooper
    Member

    Mine is smooth as silk on compression, and my rebound goes from very fast to very very slow. But I am a dainty 65kg, set at 65psi

    hora
    Member

    There’s mass panic breaking out in a warehouse/office unit on the outskirts of Portsmouth as we speak

    😆 I only have one set of forks so they cant go back. I wouldn’t be riding for weeks 😯 so it’d be the oil change with a local mechanic. Interested to hear about the weights and how many cc’s etc. I’m 97kg’s.

    Premier Icon wwaswas
    Subscriber

    I’ve used them 3 times for service/warranty stuff on different forks. If I’ve posted overnight on a Monday I’ve always had them back for the Friday.

    Local service first is probably best place to start, anyway, and I hope it sorts them.

    I have just read something about bleedijng the rebound cartridge?? Does that make sense to anyone?

    scruff
    Member

    Dynamic bleed for the damper side, it looks a faff but isnt too bad.

    http://www.youtube.com/watch?feature=player_embedded&v=bDP6X4nmp9c

    There is a proper air /oil seal under the dust seal, pop the dust seal off and lube the proper one if its feeling notchy.

    loverofminkys, 100psi for me otherwise its plowing through the travel, Ive put 20ml of oil in the damper to help it ramp up, might go for another 10ml.

    Anyway, my 2012s have been back to windwave twice. Needed new seals as it was losing air, far enough. Was still losing air on return so then had a new air assembly installed. All work done by Windwave for nowt via LBS.

    Premier Icon davosaurusrex
    Subscriber

    Can I just point out I’ve had my Pikes since last September and they haven’t started knocking (yet).

    hora
    Member

    Can I just point out I’ve had my Pikes since last September and they haven’t started knocking (yet).

    mutter grumble mutter

    PWNED! 😀

    jaame
    Member

    I changed the oil to Repsol 10w. Not sure if there is a bit of air left in the cartridge though… I haven’t tried them yet but I’d say just in the kitchen the rebound is slower.

    Unfortunately I tore the air seal when trying to stick the seal head back in from the bottom of the air cartridge. I reassembled it from the top and it’s holding air but I’ve ordered a new one.

    Any of you guys had problems with getting the seal head back in after changing the travel?

    Anyone got any tips for bleeding the damping cartridge? I noticed the after I followed the steps on that video, I couldn’t be sure if all the air came out of the compression side. There is a squelchy sound when they rebound but I couldn’t say if it’s new or not. Damping works right to top out though.

    Also, the dust seals were dry as a bone which I guess would be why they felt sticky.

    I’ve been told the oil in the air cartridge should be 20cc of SAE90.

    scruff
    Member

    The air seal head is tight to get in, just needs gentle wiggling and a bit of lube.

    Damping cartridge I just followed the youtube linky above, seemed to work OK.

    I put plenty of Stendec grease under my dust seals.

    I’m running out of fork oil so used dexron 2 gearbox oil oin the lowers, hopefully wont affect the seals.

    julians
    Member

    I dont know if this applies to the 55CR, but on the 55rc3ti, if you store the forks upside down/on their side, or in any orientation that isnt the right way up, air gets into the damping oil and causes the rebound and compression to lose effectiveness temporarily.

    The solution I have found is to just cycle the fork a few times before you ride to purge the air out of the damper. you can feel the damping going from too fast back to how it should be within a few cycles.

    hora
    Member

    I dont know if this applies to the 55CR, but on the 55rc3ti, if you store the forks upside down/on their side, or in any orientation that isnt the right way up, air gets into the damping oil and causes the rebound and compression to lose effectiveness temporarily.

    The solution I have found is to just cycle the fork a few times before you ride to purge the air out of the damper. you can feel the damping going from too fast back to how it should be within a few cycles.

    Ah- I carry the bike in the car upside usually and when putting the wheels on before the start of the ride. Thanks for that.

    PJM1974
    Member

    I dont know if this applies to the 55CR, but on the 55rc3ti, if you store the forks upside down/on their side, or in any orientation that isnt the right way up, air gets into the damping oil and causes the rebound and compression to lose effectiveness temporarily.

    I think that applies to every fork I’ve used – as you say, cycling the fork a few times usually resolves it.

    hora
    Member

    question- surely on the first descent the fork-action would do the samething though?

    scruff
    Member

    Hora, what if you start with a climb? You hadn’t thought of that had you.

    julians
    Member

    question- surely on the first descent the fork-action would do the samething though?

    When I say cycle I mean push the fork all the way through its travel a few times (10 should do it), I guess if your descent does the same then yep it should sort it out. Maybe if your descent only uses the 20% of the travel then it wont be as effective? or maybe all the other jiggling that goes with riding means its less effective I dont know.

    All you’re attempting to do is get the air bubbles that are in the damping oil out above the piston where they will have no effect, that would happen naturally if you left the forks upright for a period, you’re just helping them along by bouncing the fork all the way through its travel.

    Give it a try, but if after cycling them a few times your damping is still too fast then its not just a simple problem of air in the oil from being stored upside down.

    jaame
    Member

    The CR cartridge is sealed, it doesn’t mix the oil and air if you flip it upside down. My DJ does that and it’s fine after a few bounces as you say.

    I went for a ride yesterday on my 55CR. To recap, the rebound was originally good on the slow side of the middle setting. After a few hours it became too fast even on the slowest setting. The compression range was perfect as stock. Fully off great for small bump sensitivity, half way in and giving a lot of support for pushing through corners and hard braking.

    I’ve changed the oil to 10w (stock is 7.5). Now I feel that the rebound is just about slow enough on the slowest setting, but the range of compression damping adjustment has moved too much. The damping is acceptable now for hard riding with the rebound set on fully slow and the compression set fully open. However, I’d like to change the compression settings to how they originally were with 7.5wt oil.

    Which leads me to my next question… anyone have any experience with revalving the rebound or compression ends? I guess I could try to remove a shim from the compression stack and keep using the 10w oil, or switch back to 7.5w and do somthing to the rebound end to make it slower? I haven’t got any experience of doing this, and sending it off to have it done isn’t an option.

    jaame
    Member

    I forgot to mention… I’m pretty sure there is still a little bit of air in the damper. When I was doing it, I tapped it and a lot of air came out, then I left it for about 20 minutes until the bubbles stopped coming out, but I felt at the time that the oil level didn’t go down enough to fill the compression stack at the bottom as per that video.

    Next time, I’ll try pumping it in and out to get all that air out.

    Have just bought a pair of these in 170mm – how much faff is involved in dropping them to 150mm?

    Dont mind fiddling with stuff but dont want to really be faffing with oil levels etc on a brand new pair of forks

    hora
    Member

    Agree. Ridiculous- I remember my old 36 Floats were so simple. Ditto Lyrik air to coil conversion by comparison. Mazz should default to 150mm with ‘can be increased’ rather than vice versa IMO.

    help needed – and I must say I’m pissed off with these forks already.

    No information on Marzocchi’s website yet they bundle the spacer in with the forks.

    Anyway took the lowers off and collected the small amount of oil in there, undid circlip on air side, removed aluminium end cap from rod, removed bottom bumper, circlip and aluminium retainer. Removed black rubber/plastic spacer from coil spring, inserted 20mm spacer then reinstalled rubber/plastic spacer, built back up but the confusing thing is the fork stantions still measure 170 ish mm and the forks achieve full 170mm travel with a small amount of air and on the bench.

    Have I put the spacer in the wrong place?

    Also the air seal is a shit set-up, you have to ‘tuck the seal skirt back in with a screwdriver as the chamfer isn’t big enough on the lower leg for it to squeeze the seal in itself.

    Wished I’d just bought the coil version – would have been riding by now.

    PJM1974
    Member

    It sounds more or less correct, but it’s hard to visualise without pics.

    Can you possibly post some and I’ll take a look later?

    Found a pic on Pinkbike where the spacer is on top of the negative spring- not sure what difference it should make but when i stripped the fork back down to move the spacer about it turns out the circlip has blown out of the groove. Something is slightly too long for it too seat in the groove properly hence the lowers going back to 170mm ish travel.

    shit forks so far.

    Figured why the circlip wont now fit-the inner air tube has moved off i presume the top air seal making it ‘slightly longer’ hence the circlip groove being covered.
    Have to now remove top cap and have a look in the top end….except its too tight and wont budge so now now needs some gentle heat applying….

    pile of crap having to do this much pissing about to make them 150mm.

    hora
    Member

    I empty all air out. Cycle forks. Pump back up.

    Bobby dazzler.

    toys19
    Member

    Changing the travel on mine was piece of piss as was the dynamic bleed.
    So far they have been bloody awesome.

    This is how the spacer ended up;
    upload images free

    but this is the problem- the inner air tube has come off its top seal, the only way to get it back on without damaging the lips of the seal is to take the fork cap off, but as stated previously even with a new cassette removal tool the cap is too tight and cannot be removed.


    upload images free

    hence the circlip wont engage in in the groove as the inner air tube isnt seating properly.


    image hosting free

    Im sure they’re awesome but too much pissing about on a brand new £450 item for me. The stuck/unable to be removed topcap was the final straw.
    Will ring Windwave on Monday

    fr0sty125
    Member

    I have some 350 CR on the way I’m glad I don’t have to bother with lowering them!

    hora
    Member

    See my new topic: http://singletrackworld.com/forum/topic/fork-stanchion-marks-thoughts

    Any one else?

    Otherwise the forks ROCK 🙁

    fr0sty125
    Member

    So I just fitted my 350 CR and the manual that came with it doesn’t even mention this fork but it is basically the 55 CR with new lowers and uppers. I weigh about 68kg and I pressurised it to about 80 psi, the compression is set all the way to – and rebound is in the middle. The result of my living room test being very little sag and a very harsh beginning of the stroke it also doesn’t use much travel at all.

    Any thoughts?

    PJM1974
    Member

    Something doesn’t sound right to me there…I’ve never seen a 350CR, much less set one up but it can’t be a million miles away from the 55CR surely?

    I’m guessing that the compression is backed right off (I never use mine unless I’m riding on road), the middle setting for rebound would be about right…try letting out 20psi and see what happens.

    It might also pay to ensure that the lowers have oil in and that the seals are lubed. If the fork has been stored flat in transit then seals might dry out causing the stiction you’re describing. It might even be resolved by leaving the forks upside down overnight to allow the oil to reach where it needs to be.

    scruff
    Member

    My new seals were tight but improved after a few rides.

    fr0sty125
    Member

    So I lowered the pressure by 15 psi. They sag a bit when I bounce on the bike but they jolt through their travel.

    scruff
    Member

    You could lift the dust seals off and lube them up and the oilseals underneath.

    hora
    Member

    Break em in?

    fr0sty125
    Member

    I spoke to Windwave and they advised me to try and break them in. I took nearly all the pressure out of the spring and pumped the fork through all of the travel a few times this made it feel a bit better. I can see lube around the edge of the seals so I imagine they are well lubed already.

    my seals were bone dry when i sripped my new fork ( as above posts). Squirted a fair bit of oil in the lowers to be on the safe side when I rebuilt them.

    fr0sty125
    Member

    There is something definitely right with this fork it doesn’t even sag properly when at 50% of recommended pressure. I will give windwave another call tomorrow about oil and such as I don’t even know what weight oil goes where and how much of it.

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