990 run a 140/80 18 rear?

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by JoshBMW, Aug 6, 2013.

  1. JoshBMW

    JoshBMW Been here awhile

    Joined:
    Sep 3, 2010
    Oddometer:
    453
    Location:
    Seattle Wa
    Can they?
    #1
  2. Zuber

    Zuber Zoob

    Joined:
    Sep 28, 2004
    Oddometer:
    2,613
    Location:
    Main Street, Shedd, Oregon
    It can be mounted. It looks a little weird. But, I've had some customers that do it. The rim is not protected very well. I wouldn't do it.

    The 140-18 tire is really meant to be mounted on a 2.5-3.0 in rim. The stock rim on the Adv is 4.5".
    #2
  3. mousitsas

    mousitsas Long timer

    Joined:
    Oct 10, 2008
    Oddometer:
    3,306
    Location:
    Athens, Greece
    990 has a 4.25 I think.
    I have used a 150 tyre on a 5.0 rim before, without ill effects to handling whatsoever and a 140 tyre on a 4.25 rim sounds less extreme surely. Lack of rim protection though is an issue.
    #3
  4. TcRulz

    TcRulz Been here awhile

    Joined:
    Dec 25, 2010
    Oddometer:
    289
    Location:
    Home of all things fridgid - Bathurst.
    Here in Australia alot of us run the 140/80-18 Dunlop rally raid. It's the only size it comes in and I thought it was purpose built for the 950's. It has good traction off road and last a long time on the bitumen roads.
    #4
  5. DustyWheels

    DustyWheels Nomadic motorcyle traveller

    Joined:
    May 15, 2007
    Oddometer:
    980
    Location:
    Lake Macquaire, NSW, Australia
    yeah I'm using a Sava 18 - 140/80, won't use anything else for the 50/50 riding I do.
    #5
  6. Top Bloke

    Top Bloke Porky Rider

    Joined:
    Jun 8, 2007
    Oddometer:
    111
    Just mounted a MT21 in 140/80-18. Looks fine to me.
    [​IMG]
    #6
  7. Gustavo.Ramos

    Gustavo.Ramos Long timer

    Joined:
    May 19, 2008
    Oddometer:
    1,054
    Location:
    Accross the pond
    Many Pirelli MT21 and Dunlops 908RR 140/80-18 without any issues.

    Dunno even if these are available in higher widths
    #7
  8. Top Bloke

    Top Bloke Porky Rider

    Joined:
    Jun 8, 2007
    Oddometer:
    111
    What sort of mileage can I expect from the MT21? Heading on a big desert trip in a few weeks and wondering whether I should stock up on some more rubber:evil
    #8
  9. Gustavo.Ramos

    Gustavo.Ramos Long timer

    Joined:
    May 19, 2008
    Oddometer:
    1,054
    Location:
    Accross the pond
    Get the 908RR.

    For rocky desert trails the big twin will eat the MT21 like a snack:

    1000kms:
    [​IMG]
    #9
  10. Top Bloke

    Top Bloke Porky Rider

    Joined:
    Jun 8, 2007
    Oddometer:
    111
    Crap. Will do, thanks for the advice!
    #10
  11. whereisgibson

    whereisgibson Been here awhile

    Joined:
    Aug 9, 2008
    Oddometer:
    194
    [​IMG]

    140/80 on the back no problems.
    #11
  12. JoshBMW

    JoshBMW Been here awhile

    Joined:
    Sep 3, 2010
    Oddometer:
    453
    Location:
    Seattle Wa
    Thanks for the feed back guys, friends looking at a K60 for a rear and I like the 140 K60 more than the 150 K60.

    Not sure what we'll go with yet, just needed options.
    #12
  13. FakeName

    FakeName Wile E Coyote SuperGenius

    Joined:
    Jan 1, 2007
    Oddometer:
    2,044
    Location:
    San Diego
    Technically, a 140 tire is out of spec on a 4.25 rim.

    I asked Motoz specifically about this and they will not recommend their 140 tire.

    It will obviously mount up on the wheel, and I've run the 140 Dunlop myself. Didn't like it very much, but it went round and round without flying off.
    #13
  14. ABuck99

    ABuck99 0.0

    Joined:
    Feb 21, 2009
    Oddometer:
    708
    Location:
    Georgia
    `how many threads about this...If you have access to a 150 profile for the 4.25 rim- its a better fit, and better handling. Depending on the brand of 140/80-18 ( widths vary), when mounted on the 4.25 the 140 looses some curvature, it flattens out because the side wall is stretched a bit- you might notice this when you lay the bike over in a turn. Unfortunately there are very limited and mostly expensive choices in the 150 range, which is why I can understand folks searching out he 140's. K60 140 has a little different tread profile, but I would doubt you'll notice much difference in how it hooks up in the dirt. It probably wont last as long as the 150 with the continuous center tread.
    #14
  15. scottrnelson

    scottrnelson Team Orange

    Joined:
    Apr 3, 2006
    Oddometer:
    1,545
    Location:
    Pleasanton, CA
    I'm curious what you like better about the 140 K60 than the 150.

    I'm quite happy with the off-road behavior of my 150. Both front and rear are not "smooth" on the road, but they get good traction in turns, which is the most important thing to me.
    [​IMG]

    I realized that each size has a slightly different tread pattern, but the 140 looks very similar to the 150 in tread shape.

    [​IMG]
    #15
  16. ride-for-life

    ride-for-life Been here awhile

    Joined:
    Nov 20, 2006
    Oddometer:
    279
    Location:
    NW Arizona
    I ran 140's on the stock wheel, but now I have 3.50x18 rear so I don't worry about what I never worried about before :lol3
    #16
  17. renogeorge

    renogeorge Let's ride!!

    Joined:
    Apr 7, 2007
    Oddometer:
    2,188
    Location:
    Reno
    Just put 5k miles on a set of Heidenaus on my 990 going to Alaska. I am very happy with these tires! Rear should go another 3 or 4 k easy. The 150 rear does look huge. The profile is very flat. Looks almost like a car tire compared to a 140 on an 800 BMW. I didn't notice any bad effects on my trip. Maybe the profile puts more rubber on the road and helps with mileage??
    #17
  18. Enduro10

    Enduro10 Been here awhile

    Joined:
    Dec 24, 2007
    Oddometer:
    242
    Location:
    Brazil, Southern State
    140 cost half the price of a 150. Original Pirelli comparison.
    #18
  19. JoshBMW

    JoshBMW Been here awhile

    Joined:
    Sep 3, 2010
    Oddometer:
    453
    Location:
    Seattle Wa
    The newer 150's have a solid band center. On my 1150 it makes a great road tire, good rock gravel off road tire but any thing wet it acts like a slick and just dose 0.

    The old 150 like your pic and the 140 have lugs, that work better in wet, mud ect.


    #19
  20. JoshBMW

    JoshBMW Been here awhile

    Joined:
    Sep 3, 2010
    Oddometer:
    453
    Location:
    Seattle Wa
    And that's another reason! :D
    #20