Beautiful Bicycle: Darren Baum’s 650B MTB

Around the time of the Australian Custom Bike Show, Baum Cycles sent me photos of Darren’s own 650B Extensa MTB. Because it was going to be unveiled at the show, I wanted to wait a little while before posting it. I know a lot of you want to see more MTB content on the site and I can’t think of a better offering to the gods of dirt.

Built with SRAM’s XX1, this is a die hard MTBr’s dream machine and it’s already got me contemplating  my own 650B MTB.

See more below!

Many thanks to Baum for sending these over!

11 Comments »
by prolly |
Beautiful Bicycles
This entry is tagged: , , , ,


  • http://twitter.com/klei_ber Brian Kleiber

    Excited to see some more MTB content! Know anyone else running the XX1 without a chain guide? 

    • http://www.facebook.com/profile.php?id=1375154064 Aaron Garcia

      Brian, XX1 is specifically designed so that a chainguide is unnecessary. There are alternating tall and short teeth on the chainring that interlock with the chain to keep the chain from jumping.

      • http://twitter.com/oheyitschasm Brian

        god dammit thats cool.

  • http://www.facebook.com/ericbaumann Eric Baumann

    Holy moly! stunning bike and photos, as usual from baum. that is a show stopper. also +1 for 650b! and more mtb content! hell yea!

  • http://twitter.com/ecoDoug Doug

    toight, but that narrow no-sweep bar looks painful.

  • Mr_Bridge

    That looks phenomenal, 10/10 to the photographer too.
    Nice to see logo-less ENVE carbon hoops too.

  • http://twitter.com/princeofbraddon Jamie Mac

    SO hot

  • http://profile.yahoo.com/3N6LP3TE3XZF3KLN663IJ4UZAY Craig

    Squirt. Love the ring with no guide and custom-painted fork. As cool as the XX1 is, seems overkill for a bike like that.

  • http://www.facebook.com/daniel.torres.1048 Daniel Torres

    This bike is amazing! I still think that 1×11 is cool but the 10-42t is a tad ridiculous imo. Not sure if i’m a fan of 650b yet. Still love the 29′s! Still a beautiful build.

  • Scott Hawks

    I have so much advice to give on your MTB build! The Baum looks…like…a….speed party!

  • Joshua Robot

    I’d love to know more about the fork and the rims. Is this a 29er fork with frame geometry designed to adapt it for 650b use?

    As for the setup, beautiful but a bit roadied out for me. Forget slammed stems, get those bars wide and get rad. 


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John Watson

Prolly is not Probably started in 2006 in Brooklyn, New York. For over 6 years it has thrived as John Watson, the sole author, documents multiple facets of cycling. With the boom of urban cycling, Prolly is Not Probably has grown to be the number one blog for the culture surrounding it. In recent years, a large push for original content has spawned a steady flow of photosets, profiles and portraits.

Known for his A Day in 10 Photos, Merckx Mondays, Recent Roll, Shop Visits, and Beautiful Bicycles features, John continues to document bicycles of all kinds and his daily life through photos. Over the years, Prolly is Not Probably has been cited in the New York Times, COG Magazine, Urban Velo and other notable publications. In March of 2011, John moved to Austin, Texas where he continues to cover a cross section of cultural influences.

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