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  1. #1
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    marta sl rotor, what's a good alternative?

    i'm having a bit of trouble with my marta sl rotors, (the wavy jobs). the front in particular is causing my fork to judder, and it just doesn't feel good! could anyone recommend a good alternative?

  2. #2
    It's about showing up.
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    How long have you had these installed.

    What did you do to break them in?

  3. #3
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    This actually sounds more like a set up problem. Are your mount tabs/posts properly faced and such?

    You can run hayes, avid, formula rotors if you want. Or, the SL drilled rotors from magura will work. They are heavier, though.
    Lead by my Lefty............... right down the trail, no brakes.

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    they're broken in, i've been using them for a couple of months now. regarding the set up, it is as should be...

    the problem i have is with the magura 'ABS' effect that the wavy rotor gives. it is the front brake that i have the issue with, in particular the visible effect that it has on my fork!

    so, i was thinking maybe hope mono mini, or formula rotors but, i'm not sure if the braking surface is sufficient?

  5. #5
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  6. #6
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    Just by looking at the rotor, I would venture to say that this ABS effect is caused every time the pad hits a rotor spoke which are close to being perpendicular to them.

  7. #7
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    Quote Originally Posted by madskatingcow

    thanks, that's very informative.

    how did the brakes fair on your epic?

  8. #8
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    Quote Originally Posted by parkincake
    they're broken in, i've been using them for a couple of months now. regarding the set up, it is as should be...

    the problem i have is with the magura 'ABS' effect that the wavy rotor gives. it is the front brake that i have the issue with, in particular the visible effect that it has on my fork!

    so, i was thinking maybe hope mono mini, or formula rotors but, i'm not sure if the braking surface is sufficient?
    The new R1 formula rotor (single or 2 piece) have a larger braking area (about 2mm more) than the oro series). If you run a 180/160 set up, you'll save some weight too Compared to the area of the wavey rotors, I think you'll have plenty of braking surface

    The 2 piece R1 rotors are on sale at speedgoat, but still pricey. I think the 2 piece looks nice, but not worth the price just for weight only.
    https://www.speedgoat.com/product.as...at=26&brand=89

    This ABS affect is interesting. Since the 2009 martas are using the 6.1 pads, I could see the pads hitting the rotor arm more. The pads hit the rotor arm (just barely)on my 2007 martas with the 5.1. I think I would have a hard time getting used to it as the poster in the magura forum said.
    Last edited by ziscwg; 03-30-2009 at 03:08 PM.
    Lead by my Lefty............... right down the trail, no brakes.

  9. #9
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    Well, I have the 180mm rotor up front. In dry conditions, I don't experience any judder at all - only in wet, muddy conditions : judder + noise. My friend with has Cannondale Scalpel has the 160mm mounted up front on his Lefty. When braking hard going downhill, the judder is noticeably there.

    Perhaps a good alternative would be Formula's rotors? The regular ones they have are about the same thickness as the Marta's (2.1mm). The R1 rotors are only 1.72mm. Haven't thried them however.

  10. #10
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    Quote Originally Posted by madskatingcow
    Well, I have the 180mm rotor up front. In dry conditions, I don't experience any judder at all - only in wet, muddy conditions : judder + noise. My friend with has Cannondale Scalpel has the 160mm mounted up front on his Lefty. When braking hard going downhill, the judder is noticeably there.

    Perhaps a good alternative would be Formula's rotors? The regular ones they have are about the same thickness as the Marta's (2.1mm). The R1 rotors are only 1.72mm. Haven't thried them however.
    The R1 rotors are thinner, but the magura pistons can move a lot before there is an issue. There could be a heat absorption issue on the long DHs. The regular Formula rotors are just under 2.0 and should be fine.

    I think the SL drilled once would be a better choice. The weight is about the same and they are rather inexpensive at PricePoint.com. I think I saw them for $20. I have not seen any new Formula rotors for less than $32
    Lead by my Lefty............... right down the trail, no brakes.

  11. #11
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    Drilled SL rotor in 160mm weighs 142g, the same size Formula is about 110g I think.

  12. #12
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    Sure they do, even cheaper... $17 at Price Point
    I'm a member of NSMBA and IMBA Canada

  13. #13
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    Quote Originally Posted by madskatingcow
    Drilled SL rotor in 160mm weighs 142g, the same size Formula is about 110g I think.
    I remember them being less than that and maybe the 180mm around 150 gr. I will look at my pics later tonight.
    Lead by my Lefty............... right down the trail, no brakes.

  14. #14
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    I found the pics
    formula 160
    Form_160-c.JPG

    formula 180
    Form_180-c.JPG

    Magura SL drilled 160
    Mag_SLDrilled-160-c.JPG

    Magura SL drilled 180
    Mag_SLDrilled-180-c.JPG
    Lead by my Lefty............... right down the trail, no brakes.

  15. #15
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    Ah, even better I looked up the weights on the Magura website under accessories

  16. #16
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    Two weekends ago I rode the Marta SL's 2009 in very muddy conditions. After a while a clear 'judder' feeling in both the front and rear brake could be felt. The bike / brakes were properly cleaned and air dried afterwards. Yesterday we went out for a ride, and I was very amazed that every time I braked, the whole front fork / rear triangle vibrated : like braking on cobble stones. Afters 50km the feeling was still present. I inspected the contact area of the pads on the wave rotor : only the upper & lower part showed marks of the pads rubbing the discs - perhaps sanding the pads a little will cure this?

    As stated elsewhere in this topic, perhaps due to the extra pad material, toughing the rotor spokes, the new '09 models are more subject to judder? I'll think I'll mount some (round) Formula rotors instead of Magura's wave rotors for my next ride. This is a problem that is popping up on more and more websites. Perhaps back to the drawing board for the disc / pad combination?


  17. #17
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    i put a hope rotor on my front brake. the judder is still there but not as bad... i think as you say madskatingcow, 'perhaps sanding the pads a little will cure it?' or indeed formula rotors may be the solution.

  18. #18
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    Well, I have update the thread on Magura's Marta SL forum, hoping to find out more there. There are also similar topics / complaints about this issue there. Hope we're not going down the Avid Juicy path ...

    This shouldn't be happening, isn't it? The judder is not minor, it's huge and disturbs the concentration on technical sections

  19. #19
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    madskatingcow,

    how have you got on with the formula rotors?

  20. #20
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    Well, I mounted myself the Formula R1 front rotor which I still had laying around from my set Formula R1 brakes (which I sold). A few runs up and down the street : issue was gone, no more juddering.

    Two things :

    a) I might mount the Formula Oro rotor as it has about the same thickness as the Marta SL wave rotor. The R1 rotor is really thin, but the lever feel of the Marta's doesn't change : reach & modulation are the same

    b) At first my wave rotors didn't judder, but they were after a muddy ride. What I noticed was that the brake pas had worn out a little concave ( ~ hollow) The mid part of the pads was glazed, the outer parts that hit the 'wave' of the rotor were thicker than the middle part, so they were sticking further out and touching the waved part / spokes of the rotor. I sanded the pads slighttly to take away the glazed part.

    The brakes are really awesome, it's just that the rotors don't really match that well with the new 'Louise' pads.

    Picture of my Marta SL 180mm wave rotor, note the area that is used by the brake pads, especially how low the brake pads go on the rotor arms :



    Close-up picture of the brake pad / Marta SL rotor - note the color of the pads where it makes full contact & where it touches the spokes.



    Picture of the Marta SL 180 disc on top of Formula's R1 180 disc : note the increased brake area of the R1 rotor vs the Marta SL rotors.



    ps : Next week I'll be receiving my Magura Marta SL Magnesiums
    Last edited by madskatingcow; 04-24-2009 at 01:37 AM.

  21. #21
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    hey that's good news!

    i totally agree with the fact that the pads do not have an adequate braking surface to work correctly with the sl rotor.

    i'd ideally like 'the passion people' to admit this though, and rectify it, (dream on).
    Last edited by parkincake; 04-24-2009 at 01:39 AM.

  22. #22
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    I have added two more pictures in my previous post

    I am running now Formula R1 180 / 160 rotors, issue is gone

  23. #23
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    Interesting...

    Using XT brakes with Magura SL-rotors, I have quite similar issues: same glazing at the center of the pad, vibration, not so superb brakepower. Hastely changing the front-rotor for some standard Shimano fare without even looking at the brakepads solved the problem. Rear (with SL-rotor) can still be shuddery and noisy (low, scary vibration-noise) in the wet (seatstays are not that stiff on my Turner Nitrous). Pitty, because I love the shape of the Magura's...

  24. #24
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    Will the 2 piece rotor fit????

    Im also having problems with glazing/juddering with my Marta with SL rotors
    Does anybody know if i can use the R1 two piece rotor??? Will the rivits on the rotor make a problem??

  25. #25
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    Quote Originally Posted by Thomas
    Im also having problems with glazing/juddering with my Marta with SL rotors
    Does anybody know if i can use the R1 two piece rotor??? Will the rivits on the rotor make a problem??
    I'm wondering the same thing. Will the two piece R1 rotors work with magura marta sl brakes? Anyone running this combo?

  26. #26
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    Hmm well just to tag on to this thread a little late in case someone drums it up on search, I got '09 Marta SL's late last year and ran them from the get-go with the drilled SL rotors (non-wavy). Worked great.

    Pad-change time today, and I threw on a set of the wavy Marta SL rotors to match and save a handfull o grams...big mistake. Seemed ok around the neighborhood...took the bike out on the real mtb trails and things got strange. Rubbing, and that clicking ("juddering" I have discovered folks call this.) I had no idea what was going on.

    Then I started struggling with my front (180) brake, pistons would not retract right, could not get it to stop rubbing, I bled it two or three times, cycled the rotors back and forth...never right. Hours. Gave up. Got on the Magura forum (on their website)...found out many people had similar problems. Ugh...what a waste of time and money. I pulled the pads, sanded the inner edge a little (luckily only one hard ride in but the pads had already started to wear uneven.) The uneven pad pressure had been causing the pistons to jam as well...cycled them a few times with the pads out and re-bled.

    Installed drilled SL rotors (new) I had lying around as spares...adjusted...now things are fine.

    It is a shame that Magura even would suggest that these Marta SL rotors work with the 2009 Marta SL brakes. They not only make noise, they can damage the brake, or at least cause the pistons to jam, this happened to me on one ride. Any brake problems can be potentially dangerous to the rider, so this is not something to take lightly. I recommend anyone using the 2009 brakes to run the drilled SL rotors...the first set worked fine for me.

  27. #27
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    Good thing Magura is finally acknowledging there is an issue, they are proposing an exchange of the Wave SL Rotors for Drilled SL rotors, more here.

    They claim 80% of riders have no isse, but 20% does. There is not one single user of the 2009 Marta SL brakes I personally know that doesn't experience this issue. Hence, plenty of online magazine reviews mention the 'pulsating effect' of these brakes as well. I assume it's 80% with issues, and 20% without.

    I got a response from Magura support that their brakes are incompatible with other brands of forks. What a joke! One of my other friends has Marta SL Mag's World Champion Limited Edition 2009, 160 F / 160 R mounted with a Magura Durin SL. He has the same juddering issue. If they are incompatible, where is it mentioned on the box?

    I've had the issue with Marta SL's 2009 (anodized red). Since I got myself the Marta SL magnesiums 2009, I've been riding R1 rotors. Braking is still not as 'smooth' as with my Formula Oro K24's I used to have and the lever's contact point is a lot further due to the thin R1 discs (1.6mm). So I thought hey : why not give the 'Marta SL Wave' rotors a second chance? So I did, and went out for a 55Km ride yesterday. Only took a few times braking to have the juddering issue re- appear in the front fork.

    As a final option I'm going to fit Formula Oro discs (1.9mm), if that doesn't work : exit Magura and I'll be looking at SRAM / Avid XX brakes.

    I can appreciate the proposal of swapping the Marta SL rotors for Drilled SL rotors, but why spend a fortune on getting one of the lightes brakes on the market (Marta SL Magnesium) when you have to mount heavy Drilled SL rotors to have the brakes work properly due to a design flaw?

  28. #28
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    Quote Originally Posted by madskatingcow
    I can appreciate the proposal of swapping the Marta SL rotors for Drilled SL rotors, but why spend a fortune on getting one of the lightes brakes on the market (Marta SL Magnesium) when you have to mount heavy Drilled SL rotors to have the brakes work properly due to a design flaw?
    They are doing something, but I have to wonder that why this didnt show up with any of their testing

    I agree to have to put on heavier rotors sucks. However, I dont think they can just toss a rotor out there that fast. Design and Prod set up can take time. Although, it has been a while now....................I think they should have something other than the SL drilled.

    I wonder is some designer said "Hey, we can use the same rotors and not have to design/relicesne something esle."
    Lead by my Lefty............... right down the trail, no brakes.

  29. #29
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    Quote Originally Posted by rideronthestorm
    I'm wondering the same thing. Will the two piece R1 rotors work with magura marta sl brakes? Anyone running this combo?
    I believe so, but I have not tried them on a Mag SL. The rivets are near flush with the R1 2 piece rotor I have.

    They are thinner!!!!! 2.0 mm vs 1.65 for the R1. This may give you some piston reach problems, but I dont know for sure. Just a consideration.

    The r1 2 piece are pretty, but pricey. The 1 piece weigh like 5 gr more at most and are like 1/2 the price. They are way easier to straighten too.
    Lead by my Lefty............... right down the trail, no brakes.

  30. #30
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    Sl Rotor

    Same judder noise as stated on here and magura sight. Just got off phone with service center new (Venti red rotors) being shipped (Free).
    Great Service in my Book

  31. #31
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    Quote Originally Posted by Bonehead
    Same judder noise as stated on here and magura sight. Just got off phone with service center new (Venti red rotors) being shipped (Free).
    Great Service in my Book
    As madscatingcow said above, why spend a lot of money for lightweight brakes and then using a pair of ventidisc or drilled rotors.

    I have the same problem with the juddering and I ride the marta SL 2009.
    Friend of me uses the regular marta, same problem here.

    So I think 20% is a totally underestimating by magura.

    I've also the 2008 model and the juddering isn't even worth to notice.

    So the louise brake pads must be the cause of this problem.

    I'm gone try with formula Oro disc's aswell.

  32. #32
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    Any update on this problem? I own a set of 2010 Marta brakes suffering the studder, shudder, shake anytime the brakes are applied.

  33. #33
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    If you read the thread posted earlier : there is a new Magura Storm SL Rotor. All new Marta SL brakes should ship with the new rotors.

    Furthermore, they are developing new brakes, spy shots of Sabine Spitz bike in Offenburg were posted on Magura's mission performance website. Unfortunately, no close- ups.

  34. #34
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    I have sold them and bought a pair of Formula Rx ....

  35. #35
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    I'm currently riding SRAM XX brakes. If Magura comes up with some new brakes, I'm always interested

  36. #36
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    Contact customer service and get free set of rotors

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