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  1. #1
    Senior Member sers's Avatar
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    Oct 2005
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    Salem, MA
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    Land Shark, Level Professional, Tsunami singlespeed, Giant Reign 1
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    final thoughts after upgrading my mark v's drivetrain

    Today, I finally had a chance to put the finishing touches on my Mark V's new drivetrain ( Pictures and details here ) After removing the 1mm bb spacer, my chainline was as close to perfect as I can tell and quiet to boot.

    After 10 odd miles of riding, I was thoroughly impressed with the setup. My new 49/18 gear ratio makes spinning, hills and starts a lot easier, although moving a little less per revolution is going to take some getting used to. It's smooth, responsive and stiff, and for not a terrible amount of money.

    I'm sort of glad that I opted to go with the sealed cartridge bb, instead of the sugino 75, since there was a decent amount of brown grimey water that came out after the original bb was removed. I also would estimate that my chainline is off by less than a mm, so a 109 wouldn't make a world of difference.

    I'd also like to note that the threading on the IRO BB might be a little odd. I make absolutely sure that I wasn't stripping the bb, but there's varying amount of resistance when instaling. Perhaps it's the UN-73 bb.

    The stock drivetrain on the IRO is the weakest link, especially if you ride it a lot. While a new chainring might do the trick, money spent on an upgraded drivetrain is mone well spent.

  2. #2
    Loners FridgeRobot's Avatar
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    Dec 2005
    Location
    Richmond VA / Fairfax VA
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    1980s Schwin Sprint SS, IRO Mark V
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    Quote Originally Posted by sers
    The stock drivetrain on the IRO is the weakest link, especially if you ride it a lot. While a new chainring might do the trick, money spent on an upgraded drivetrain is mone well spent.
    +1 I just went through and picked apart my drivetrain to figure out a clicking noise i was having...it turned out to be the chainring although i did replace the BB too, which ended up needing to be returned for non compliance w/ my crank arms...but alas it was that stupid chainring... and im done rambling
    Quote Originally Posted by jyossarian
    For real. The quickest way to a woman's heart is between the 3rd and 4th ribs.

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