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Re: Shimano Nexus commuter build

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  • Rich Wood
    The change to a 20 tooth hub cog will almost certainly require the addition of a chain tensioner of some sort if the 21 tooth currently on the bike gives a
    Message 1 of 3 , Jul 15, 2009
      The change to a 20 tooth hub cog will almost certainly require the addition of a chain tensioner of some sort if the 21 tooth currently on the bike gives a good chain adjustment with the vertical dropouts. I am not sure that the change to a 1/8" hub sprocket will have any benefit as far as chain or sprocket wear is concerned.

      One of the reasons I chose the Steelwool Tweed frame for my Alfine hub build was the eccentric bottom bracket for chain adjustment. Certainly your use of a used frame was a less expensive way to go however.

      Rich Wood

      --- In Geared_hub_bikes@yahoogroups.com, "vredstein" <stuckinscranton@...> wrote:
      > Here's a link to quite a few pics of my latest project.
      > http://www.flickr.com/photos/38536428@N04/
      > Many thanks to members of this group for sharing information that was invaluable in helping me build up my latest commuter bike.
      > I can't remember the exact moment that sparked my interest, but sometime around January, I found myself reading through the threads on mtbr's Internal Gear Hubs forum. Shortly after, I found this group.
      > I initially planned on using an old Bridgestone MB-6 frame I got for cheap. But later, a perfect Fuji Touring frame in my size turned up on Ebay and I couldn't pass on it.
      > As part of this project, I learned to build wheels, thanks in large part to information from mtbr's mountain top guru Mike T and the guru's guru, Roger Musson.
      > I just got what I think might be the last finishing touches installed, an Arkel Tailrider bag, Pletscher rack, and Planet Bike computer mounted with the Dinotte 200L light on a Nitto Lamp holder.
      > Here's the spec sheet.
      > Frame-1998 Fuji Touring, True Temper AVR steel, 53.3 cm
      > Front wheel-32h Velocity Synergy rim, XT hub, Wheelsmith DB14 spokes, brass nips, Pitlock skewer, 700x32c Schwalbe Marathon Supreme tires.
      > Rear wheel-36h Shimano Nexus "Red Band" hub, 21t cog (soon to be replace with an 1/8" Sturmey Archer 20t cog), Mavic A319 rim, Wheelsmith DB14 spokes with brass nips, Another Schwalbe Marathon Supreme tire.
      > Tange Levin headset, TTT Motus stem, Nitto lamp holder, Nitto Noodle bar, Cane Creek levers, Jtek bar end shifter, Rolls saddle, Planet Bike Cascadia fenders, 44t Sugino Messenger crankset, Izumi 1/8" chain, 103mm Phil Wood bottom bracket. Time ATAC pedals, Shimano BR550 cantis, Stella Azzurra Techno Spugna tape, Elite stainless cage, DA cables and housing, a nice fork crown housing stop for the front brake gives a smooth cable routing. I went with a link wire up front and a traditional yoke in the back for variety.
      > I was very luck with the chain length and chain line. The frame has vertical dropouts, but the present gearing allows me to use an even length of chain with no need for half links or a tensioner. Shimano's supplied 21t cog is dished, so I had some flexibility for chain line, but was still surprised to find a 103mm bottom bracket worked with a touring frame.
      > I like the Arkel bag/Pletscher rack combo because I can set it up low and forward to minimize its influence on how the bike handles. I could still scoot the rack forward a couples inches, but that would make opening the bag's gaping lid awkward.
      > The Planet Bike fenders will probably on see use during Tucson's current monsoon season. I chose them because they provide the fullest coverage, more than anything SKS has to offer.
      > If given the chance, I would change only a few things. A Nitto big rack and matching NItto 27.0 seatpost would look very nice, but the current rack and post are perfectly functional. I want an entirely 1/8" drive train, so a Sturmey Archer cog will replace the supplied Shimano 3/32" cog.
      > I'm thinking about installing a Herbie Chainglider, but only if I can be sure it won't add any noise. This Shimano hub is dead silent.
      > All in all, this is a great commuter bike, and building a bike from the frame-up, including wheels is extremely satisfying.
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