tire question

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by what car??, Mar 7, 2013.

  1. what car??

    what car?? down the road

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    I am currently in Quetzeltenango, Guatemala and looking for new tires. I did find some at a local vendor; my question is this, for a 2010 990Adventure can you mount up a rear tire that is a 120/90/18 instead of the normal 150/70/18 size? What should I expect if I go this route? The tire is a Pirelli tire, don{t see how that makes a difference, but it{s also an aggressive motorcross type tire, cannot remember the model. Let me know experiences and possible expectations, thanks.

    Cheers
    #1
  2. mousitsas

    mousitsas Long timer

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    well, NOOOOO unless your only other choice is to ride on the rim. If you have to though, make sure you take the turns very slowly.
    #2
  3. Qwik

    Qwik Adrenaline Addict

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    Not gonna be a good fit. If it beads up it will be Square
    #3
  4. DeepInIt

    DeepInIt Long timer

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    You can order a tire up from GC, get something decent and the rught size.
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  5. SpeedyR

    SpeedyR SE in the SE

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    double check the sizes, that seems a bit odd for a size. It should be 120/100-18 which would be OK on the super enduro but would be very marginal (i.e. they(Pirelli and KTM) wouldn't recommend it as a fitment as it's putting a tire designed for a 2.15-3.0" rim on a 4" rim). it might fit but the load rating would be very low and it would be sketchy handling. a 140/80-18 would be closer but still not great, or stick with the OE size.

    if it truly is a 120/90-18 then it's even worse than the 120/100-18 (lower profile, so worse fit on anarrower rim)
    #5
  6. AustinJake

    AustinJake DR650 - Versys

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    120/90x18 is not an odd size, it's very common, and I would NEVER put that size of tire on a 4" rim

    D606 Rear: 120/90/18 C16 Rear: 130/80/18

    [​IMG]
    #6
  7. AUT-EasyRider

    AUT-EasyRider Been here awhile

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    If it is really a motocross tyre you can mount it, because the measuring method is different to normal enduro tyres, if not stay away from it.
    The 120 motocross is a 140 enduro width and 140 works well on the 4,25" rim, not allowed but good also see: http://www.dropbears.com/u/utilities/tyrerim.htm max. for 140/80 is 3,5"rim.
    measuring method enduro <-> motocross explained on michelin site:
    http://www.michelinmotorcycle.com/index.cfm?event=Baja

    I only mount cross tyres (Michelin AC10, Mitas C02) when I go to the Enduro Park Ampflwang, works fine there but not on the way to the park on asphalt, really :yikes They also dont last long on the 990 (one day in the park, + 80km asphalt to get there and back home = EXPENSIVE) but the face expressions of the EXC riders when you ride the 990 through mud holes or climb steep hills is worth it :d
    #7
  8. what car??

    what car?? down the road

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    Thanks for the information!! I greatly appreciate it, I'm not sure what GC. I eventually found a tire that was in my size, Kenda Big Blocks surprisingly! I had a pair of those before I left the states. Wore quite a bit faster than my Mefo's but hey, no worries at least I'll have peace of mind and a tire that I'm familiar with. Thanks for all the information and replies, awesome!!

    Cheers and pints all around.
    #8