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  1. #1
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    Shimano Nexus 4 speed hub / Mezzo I4

    When was the 4 speed hub discontinued? I can't find much info on it on the web yet Mezzo appear to continue to use it on one of their bikes.

    Anyone know the specs, gear ratios/weight?

  2. #2
    coprolite fietsbob's Avatar
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    Anyone know the .., gear ratios .. ?
    http://sheldonbrown.com/gears/internal.html

  3. #3
    Senior Member rcschafer's Avatar
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    You can still find installation and maintenance PDFs on the Shimano site that appear to cover everything except what you're asking

    Wait, here you go: Gear Hub Specs

    Gear Ratio: 1.00 (1st), 1.244 (2nd), 1.50 (3rd), 1.843 (4th)
    Weight: 1700g for the Nexus SG-4C35 (coaster brake), 1370g for the Nexus SG-4R35 (roller brake.)
    Last edited by rcschafer; 04-04-11 at 02:31 PM. Reason: Found additional info

  4. #4
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    Thanks, not seen that website before, very useful.

    So it only came in brake versions?

  5. #5
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    My Mezzo doesnt have a brake integrated with the hub.
    Speed Uno
    Dawes Kingpin 2speed

  6. #6
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    I'm not really following Shimano's product range system. The Nexus 7 hub seems only to come in coaster or roller brake format too. . . whereas the 8 clearly has 3 permutations, one specifically for rim brakes.

  7. #7
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    Are you interested in the I4 or the Mezzo with an I4?
    Speed Uno
    Dawes Kingpin 2speed

  8. #8
    coprolite fietsbob's Avatar
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    Gear Ratio: 1.00 (1st), 1.244 (2nd), 1.50 (3rd), 1.843 (4th)
    Does sound like a good small wheel bike IG hub, set up the sprocket ratio for low
    and the overdrive gears make all the higher gears.

  9. #9
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    The roller brake is a separate unit which bolts onto the left side of the hub. The brake engages with splines on the hub. The Nexus 4-speed and 7-speed hubs use the same types of roller brake. I have a bike which came with the Nexus 7-speed and rim brakes. I later added a roller brake to replace the rear rim brake. Some hubs with no roller brake came with a plastic cover that fits over the splines.

  10. #10
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    I'm interested in the hub, Dynocoaster. I mention Mezzo as it seems the hub is still in use for those bikes only, and I figured there must be Mezzo riders on this forum who have the 4 speed model and can offer opinions on the hub.

    I guess that means that the weight disparity, 1700g for coaster vs 1370g for roller, is due to the fact that that doesn't include the roller brake unit. . . in which case it's not a particularly light hub.

    But otherwise it does sound good for folders; evenly spaced gears and allowing the usage of a small chainring.

  11. #11
    Senior Member rcschafer's Avatar
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    I installed the coaster brake model on a mixte and am happy with it; even with 700c wheels it's still a pretty usable range of gears (it's very flat where I am.)

    One note: the Nexus-4 shifters are a little harder to find these days and don't typically come with the hub. I have a trigger shifter and it works well on upright bars; the twist shifters are more common (there's one on eBay now for $30 but I read somewhere that they might be less durable.

  12. #12
    Senior Member bhkyte's Avatar
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    Most mezzo i4 users report than its still under geared.
    Bikes; dual drive Mezzo X2 bullbar previously owned brompton with mods. Also 3 birdies + downtube FS

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