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  1. #1
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    Crank/BB recommendation for Nexus 8

    I've spent a couple of hours searching the forums for crank/bb combos that provide a straight chainline for a bike with a Nexus 8 hub. The Harris site gives the crank info for the San Jos8, as does a thread here about a nice Schwinn World Voyageur (http://bikeforums.net/showthread.php...xus+8+schwinn). However, neither one states the bottom bracket info.

    I know I can change the chainline by flipping the cog, and I've read that a straight chainline is essential for a Nexus 8. So what crank/bb combos are people are using with their Nexus 8's? A chain recommendation would be appreciated too.

    Thanks,
    Bob Chmara

  2. #2
    Broom Wagon Fodder reverborama's Avatar
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    This was something that I spent a lot of time thinking about because there's really no way to know without having done it before -- or having a bunch of parts laying around to try out. I used a 172.5mm Sugino RD crank (CK1018) on mine. For a BB, I went with a Shimano BB-UN52 68/110 which was the size recommended by the guys at Harris for that crank. I'd defer to whatever they suggest with the crank you plan to use. I got the crank from Harris and the BB from an LBS (they installed it for me).

  3. #3
    cs1
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    Quote Originally Posted by bobchmara
    I've spent a couple of hours searching the forums for crank/bb combos that provide a straight chainline for a bike with a Nexus 8 hub. The Harris site gives the crank info for the San Jos8, as does a thread here about a nice Schwinn World Voyageur (http://bikeforums.net/showthread.php...xus+8+schwinn). However, neither one states the bottom bracket info.

    I know I can change the chainline by flipping the cog, and I've read that a straight chainline is essential for a Nexus 8. So what crank/bb combos are people are using with their Nexus 8's? A chain recommendation would be appreciated too.

    Thanks,
    Bob Chmara
    As light and strong as Octalink BB's are, I would go with a square taper. There are only a few sizes availabe in Octalink. The square taper must have 20 different lengths. Please don't quote me on that. What I'm trying to say is, you stand a better chance of getting the chain line correct with the larger selection of square taper BB's. JIS BB taper went from 103 to 122mm, with a lot of sizes inbetween. Good luck and let us know how it comes out.

    Tim
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  4. #4
    Perineal Pressurized dobber's Avatar
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    Your chainline target is 43 or 48mm (http://bike.shimano.com/catalog/cycl...=1167402179521)

    When built up in it's Nexus configuration, my 1x1 has a BulletProof crank on a Shimano 113mm bottom bracket with a $10 BMX chain. I'm using the ring on the outboard of the crank. Going by the Bulletproof spec, a 107 mm BB would have given me a perfect chainline but the stay of the 1x1 are to wide.

    As for the straight chainline comment, my is supposedly off by ~0.100 and I've had zero issues (fyi, my Nexus is the coaster version).
    This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.

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