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Thread: Metezler Z8 Tires

  1. #1
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    Metezler Z8 Tires

    The bike: 2011 R1200RT
    When I was installing a new rear Z8 on my bike a while back I noticed that the sidewall seemed to be somewhat more flexible than the tires that came off the bike (Z8's also). So at the national recently I talked to the people at the Metzeler trailer about the flexible sidewall & they told me that I should be using the "O" spec tires. First I have ever heard of that. The rear on the bike is a 180/55ZR17 73W which is the same tire that the www.BMW-Motorrad.com web site recommends (among several other brands) with no mention of the "O" spec. The Metzeler web site indicates that there is a "M & O" spec of the Z8 which have different compounds & better wet weather handling.Does anyone know if the "O" spec has a stiffer sidewall & is the "O" imprinted on the sidewall?
    Thanks
    2011 R1200RT, 75 R90S, 2009 Suzuki DR650, 70 R75 Race, Vintage Kneeler sidecar R75 powered

  2. #2
    Registered User hjsbmw's Avatar
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    Quote Originally Posted by LCampbell View Post
    Does anyone know if the "O" spec has a stiffer sidewall & is the "O" imprinted on the sidewall?
    The manufacturer's claim is that the 'O' sidewalls are stiffer. What I can say with certainty is that the 'O' is imprinted on the sidewall. I see it right between the word Interact and the sizing: Interact O 180/55 ZR17.
    Harald
    2007 R1200R

  3. #3
    Registered User Rinty's Avatar
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    Well, this post had me running out to the garage with a flashlight. Turns out the front Z8 is an "M" and the rear is a "C". Must stand for "Canada," or "Competizione".

    Then I looked at a Metzeler website, and they don't distinguish any characteristics between the O or the M. Nor does Motorcycle Consumer News.

    Anyway, I just did a three day trip on them, including a few hours in rain and lots of twisties, and really like them.

    We will keep working on figuring out these mystery ratings. Harald, maybe you can post a link to your Metzeler source.
    Last edited by Rinty; 07-26-2013 at 02:24 PM.
    Rinty

    "When you don't know where you're going, any road will get you there."

  4. #4
    Registered User hjsbmw's Avatar
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    Quote Originally Posted by RINTY View Post
    Then I looked at a Metzeler website, and they don't distinguish any characteristics between the O or the M. ... Harald, maybe you can post a link to your Metzeler source.
    http://www.metzeler.com/site/de/tech.../interact.html

    May not help because it's in German, but the key is "Einfache (M) und doppelte (O) Karkasskonstruktion f?r beste Performance auf unterschiedlichen Fahrzeugen", meaning "Single-ply (M) and double-ply (O) carcass construction for best performance on different vehicles".

    The same single and double construction seems to go for the older non-letter and C designation respectively, which is why they used to specify the stiffer C for the rear in the past. It reads as if the main difference when comparing older (no letter or C) to newer (M or O) is the compound.
    Harald
    2007 R1200R

  5. #5
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    Looked at my tires again. No letter M or O. Next time I buy a set I'll know better. Thanks to all.
    2011 R1200RT, 75 R90S, 2009 Suzuki DR650, 70 R75 Race, Vintage Kneeler sidecar R75 powered

  6. #6
    MOA #148075, BMWRO Shaun09's Avatar
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    Talking to the same reps at the rally, I learned that the Z8 is also a dual-compound tire in the rear (and single, softer compound in front). That's a change from the Z6 Interact that was a single compound front and rear. The Metzeler rep also suggested trying the Pirelli Angel GT (in the "A spec" for the rear) next if I liked the Z8s. Very informative (as was the Michelin engineer). Cheers!
    Chris

    2009 BMW R1200RT (Shaun), 2004 MINI Cooper S (Gromit), 2006 BMW X3 (Wallace)

  7. #7
    Addicted to curves azgman's Avatar
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    Quote Originally Posted by Shaun09 View Post
    Talking to the same reps at the rally, I learned that the Z8 is also a dual-compound tire in the rear (and single, softer compound in front). That's a change from the Z6 Interact that was a single compound front and rear. The Metzeler rep also suggested trying the Pirelli Angel GT (in the "A spec" for the rear) next if I liked the Z8s. Very informative (as was the Michelin engineer). Cheers!
    I just changed over from the Z8s to the Angel GT. No complaints with the Z8 but the Angel GT is the best handling tire I have ever had! We will see how the mileage is, but for now, I am sold!
    MOA #107139
    RA #28511
    YB #2005

  8. #8
    Registered User Rinty's Avatar
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    ...it's in German...hjsbmw
    Thanks Harald; I just hit the translate button and converted it.
    Rinty

    "When you don't know where you're going, any road will get you there."

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