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Shimano Nexus 3 Speed or Alfine 8 Speed on BBSHD build?

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    Shimano Nexus 3 Speed or Alfine 8 Speed on BBSHD build?

    Which of these two IGHs would be most efficient and cost effective for a hill climbing BBSHD commuter build?

    Based on the gear ratios on Sheldon Browns website the Nexus 3spd ($110 at lbs) gears are basically the same as 3rd, 5th, and 8th on the Alfine ($230 at lbs). I'm planning to use the bike as a daily driver because most everything I do is within about 5 miles of my house. There are significant hills in the area though and I'm wondering if the lower gears on the Alfine would be worth the extra $120. Also from what I've read the Nexus 3 may last longer because it has less moving parts. Does anyone have any knowledge of the longevity of IGHs on a BBSHD build?

    Also in your opinion is it worth switching from a derailleur system to an IGH?

    #2
    I have the Nexus 3 speed hub with the bbshd on my fat bike. I use it for road and trail riding. I found the 3 speed covers pretty much any terrain. You can also change the front chainring to suit your particular situation. The 42T is a good all around set up. I tried the 30t and it was way too small for the road. If you have a lot of hills a mid 30t would work out better. I went with a offset rear sprocket ($30) which gives me more front chainring choices.
    My lbs charged $150 to convert the wheel, $60 for spokes, $60 labor, $20 for a disk brake converter, and tax. Add the cost of the hub and your at $260+. I also switched to a KMC igh chain for another $20.00.
    What I like is the simplicity, no chain line issues, and I shift a lot less vs the 8 speed cassette.
    The down sides are, your stuck with that wheel, and the cost of the conversion.

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      #3
      Many feel the 3speed IGH's are more durable and as the above poster states "covers pretty much any terrain". I don't completely agree, but that is for me & my riding style personally, YMMV.

      I run a Sram8 with the Luna 42T & BBSHD on my original mnt bike build. I also live in mountainous country with a lot of elevation change doing both off-road (30%) & road (70%). I have ridden 3speed IGH's and wouldn't consider them for my riding needs. With this set-up I can do 22-24mph before cadence is too fast for me, 30mph throttle only on flats while being able to climb up to 50%+ grades before I feel the system is stressed (I weigh 235#). That said I also prefer more rider input, using assist only when I either can't or simply don't feel like putting out the effort needed for a particular scenario.

      I have well over 1000miles on this system with no issues but I also am cautious not to stress it by running in higher gears simply because I can or shifting under power. If I have a complaint it is the low gears are not low enough for my riding style but I would not want to change the 42T front chainring because that would make the high end less than I would want since I'm on the road more than off. I'm using a Sram dual drive for a total of 24 gears on my new build but that is on a FS bent trike which doesn't have the chainline issues of a DF.

      The Shimano Alfine is probably a better choice than the Sram if for nothing else more shops & mech's are familiar with it. Everything is a compromise and you need to fit your personal preferences.

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        #4
        I made a dual front sprocket set up, 38/42 for the igh. It's set up as a manual change. I figure the 38 is better for the trails, and 42t for the road.

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          #5
          Harold possible to post up some photos.

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            #6
            I posted a short write up and photos in the diy section. https://electricbike.com/forum/forum...inring-for-igh.

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              #7
              I have an Alfine 8 on a Surly fatbike with BBSHD and a couple thousand km without any issues. I do a lot of hill climbing and love the range of that IGH and my Eclipse 42. I never shift under load and would use this setup again without hesitation.

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                #8
                I have a Rohloff Speedhub 14 with a Luna 42T. BBSHD motor. From a price perspective, it's overkill. But it's amazing how well the hub pairs with the motor. The power of Pedal Assist 1 overcomes all gears on flat land. The 3 speed should be fine for you.

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