Alfine 8 5th gear, 1 to 1

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  • 12-05-2012
    rocky rode
    Alfine 8 5th gear, 1 to 1
    I'm a dinglespeed rider and considering building up an Alfine 8 for a long tour with some bikepacking. Is the hub actually an efficient direct drive in 5th gear? I'm assuming if I ran 32-20 gearing (which I use now) I could still climb and ride trails in 5th gear and, with the exception of the extra weight, still be as efficient as I would be on a freehub. Also will the hub have less stress on it with power used in 5th as opposed to other gears. Thanks!
  • 12-05-2012
    dru
    If you are riding single speed you'll hate an Alfine the second you pick up the bike. I'd guess it will add 3 pounds.

    I've never ridden my Salsa with anything other than the Alfine so I can't directly answer your question. There is some drag for sure; some gears have more, others less.

    I wouldn't worry too much with 32/20. That's safe for the hub, and many have gone way lower before blowing stuff up.

    Mine's been bullet proof and was installed in the spring of '09. I've even raced it. I treat it the same as any bike with the exception of shifting technique.
  • 12-06-2012
    Andy R
    Although 5th gear is a 1:1 ratio it's not direct - the gear train is still used and therefore it's not likely to be any more efficient than any of the other gears. I also find that there's more drivetrain lag in 5th than any other gear, for some reason.
    Yes, it'll add some weight but you soon get used to it - I mostly run mine geared at 32:22 and so far (2 years +) all seems well.
    Mine's done the odd race too - I like it for all sorts of riding but especially technical stuff where the ability to select a gear while coasting/trackstanding is one of the best aspects of IGH's.
    That and having no mech to collect undergrowth.
  • 12-06-2012
    john_dalhart
    Quote:

    Originally Posted by Andy R View Post
    Although 5th gear is a 1:1 ratio it's not direct - the gear train is still used...

    Here's how the Shimano 8 actually works.

    jd
  • 12-06-2012
    jrm
    You could also
    Set up a 3 spd where the 138% top gear could have the same gear inches as the 32/20 and then the lower two gears could be your lower climbing gears.
  • 12-06-2012
    Andy R
    Quote:

    Originally Posted by john_dalhart View Post
    Here's how the Shimano 8 actually works.

    jd

    So I was wrong then - every day's a schoolday ;)

    All the backlash must just come from clutch engagement then - it's certainly the worst gear in that respect.
  • 12-07-2012
    Corporal Punishment
    Quote:

    Originally Posted by john_dalhart View Post
    Here's how the Shimano 8 actually works.

    jd

    Good read. Thanks!
  • 12-07-2012
    dru
    Quote:

    Originally Posted by john_dalhart View Post
    Here's how the Shimano 8 actually works.

    jd

    + 1 rep for you.

    'cause I've always wondered how it worked.