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Thread: 5-speed strida

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    5-speed strida


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    Interesting. The Strida singlespeed has 56 gear inches. Would you know the gear inch range of the 5 speed? I don't know where there would be a calculator for it. Sheldon's doesn't have one.

    http://www.sheldonbrown.com/gears/

    I would like to pick up an old Strida, just to tinker with it.

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    The wheels look like the 3 design.. I though that they changed that in the 5...










    No doubt yours looks cool too !

    I saw the same bike on this thread dated december 06
    http://strida.kuso.com.tw/modules/ne...#forumpost3767
    Last edited by fireworkz; 04-15-07 at 05:32 PM.

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    Bromptonaut 14R's Avatar
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    It's a 5 speed Strida, not a Strida 5.

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    Quote Originally Posted by 14R
    It's a 5 speed Strida, not a Strida 5.
    Now thats a cool mod to the Strida ..

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    Senior Member randya's Avatar
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    Quote Originally Posted by 14R
    It's a 5 speed Strida, not a Strida 5.
    It looks like it's got the Strida 3 BB.

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    miyata drive

    The Miyata bb/hub-gear is really interesting ... I haven't seen this previously.

    I found another older Miyata bike on the web in Japan with this same part ... so I guess it was cannibalized for the conversion.

    The Miyata 07 catalog shows belt drive, and belt drive to rear hub-gear combos ... but no bb/hub gear. Perhaps this component is discontinued. I hope not.

    I like the Strida, but the only way I'd buy is with a 3 speed. Any new info on the Miyata drive would be welcome.

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    Senior Member oilfreeandhappy's Avatar
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    Is that a bike? Pretty cool. I'm sure you'll get some second looks on that.
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    Part-time epistemologist invisiblehand's Avatar
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    That is pretty wild. Never heard of the five-speed crank drive.

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    Interesting. So it can be done.

    This without question is the way to go and they should find a way to work with Miyata on this five speed drive. I knew it was going to happen sooner or later. Lets hope they can keep the costs of this new version down because it looks like a 5 speed Strida will probably set you back 1K easily.

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    Bromptonaut 14R's Avatar
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    There are some really interesting mods of stridas out there,just do a search in japanese.


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    Raleigh20 PugFixie, Merc LittlePixel's Avatar
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    Loving those grey bullhorns and moulton rack!

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    I'd sure be willing to try out that five-speed!

    Anyone know any more about that Miyata internally geared crank setup? For some reason I was under the impression Shimano had made such a thing at one time... anyone know anything about that?

    The front-freewheel system of the Strida is basically a stock BMX freewheel connecting a proprietary BB spindle to a proprietary plastic chainring. It wouldn't be that hard to attach the same plastic chainring to a different freewheel of the same size. I'm pretty sure you can attach the chainring to an internally geared hub, for example. The problems would be fitting the hub into the BB of the Strida, and fitting crank arms to the axle of the hub. Wouldn't a machine shop be able to make the appropriate parts?

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    Quote Originally Posted by rhm
    I'd sure be willing to try out that five-speed!

    Anyone know any more about that Miyata internally geared crank setup? For some reason I was under the impression Shimano had made such a thing at one time... anyone know anything about that?

    The front-freewheel system of the Strida is basically a stock BMX freewheel connecting a proprietary BB spindle to a proprietary plastic chainring. It wouldn't be that hard to attach the same plastic chainring to a different freewheel of the same size. I'm pretty sure you can attach the chainring to an internally geared hub, for example. The problems would be fitting the hub into the BB of the Strida, and fitting crank arms to the axle of the hub. Wouldn't a machine shop be able to make the appropriate parts?
    Interesting idea, but such a setup might overtorque the hub.

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    Quote Originally Posted by makeinu
    Interesting idea, but such a setup might overtorque the hub.
    Yeah, that makes sense, at least intuitively. And that may be why Strida freewheels fail once in a while. But on the other hand... the hub is designed as one element of a system that transmits the torque from your legs to the wheel. That's all we'd be doing, albeit at the other end of the chain. So why should there be any difference?

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    Quote Originally Posted by rhm
    Yeah, that makes sense, at least intuitively. And that may be why Strida freewheels fail once in a while. But on the other hand... the hub is designed as one element of a system that transmits the torque from your legs to the wheel. That's all we'd be doing, albeit at the other end of the chain. So why should there be any difference?
    Because on a normal bike, every time you turn the (larger) chainring the (smaller) rear sprocket turns many times. More distance (actually rotations) is traded for less force (actually torque).

    The gear system works at every point along its path. If you connected the wheel to the cranks (as with a unicycle or penny farthering) then you'd have a very low gear. Low gears provide more torque (for hauling that load of groceries up hill, for example). Therefore, relocating a component to the crank end of the chain will result in more torque.

    Even the Rohloff requires no less than 2:1 gear ratio from the cranks to the hub. Maybe the Sturmey-Archer 8-speed could take the punishment since it takes an unusually large rear sprocket.

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    Senior Member Amuro Lee's Avatar
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    Here is another forum for Strida talking about this, too.
    http://www.stridaforum.com/forum/viewtopic.php?t=20
    Last edited by Amuro Lee; 04-19-07 at 03:25 AM.

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    The saddle clamps used on the silver Strida with the Bull-horn bars is a clever fix - it raises the saddle without the need to bring the saddle closer to the bars - which was one of my issues I had with the bike's geometry....

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    Quote Originally Posted by makeinu
    Because on a normal bike, every time you turn the (larger) chainring the (smaller) rear sprocket turns many times. More distance (actually rotations) is traded for less force (actually torque)
    ....

    Even the Rohloff requires no less than 2:1 gear ratio from the cranks to the hub. Maybe the Sturmey-Archer 8-speed could take the punishment since it takes an unusually large rear sprocket.
    Hmmm... yeah, okay, I'll buy that. The Strida crank takes an 18-Tooth sprocket; can such a small sprocket fit on the 8-speed hub? Another problem with my scheme, which I forgot to mention, is that you'd be using the hub backwards: holding the shell stationary, applying force to the axle, and transmitting that force to the cog. So it would only work for riding the bike backwards. Unless there's something you can do to the inside of the hub, to make it freewheel the other way, you'd have to flip everything else over and do a left-hand drive on the Strida... which might work, but you'd have to rebuild the whole bike ... re-weld the stem ... void your warranty for sure. It's probably easier to track down the Miyata five-speed crank.

  20. #20
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    Wouldn't a Schlumpf drive be a better solution over the FM-5? I've read something at stridaforum.com that the Schlumpf folks have already contacted the Strida folks on developing such an item.

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    Senior Member Chop!'s Avatar
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    Last time this was posted it included a video of him leaving some other riders for dead! It seems it could really shift!
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    Where would a person get such a drive?

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    Quote Originally Posted by davidp View Post
    Where would a person get such a drive?
    I've been searching on ebay ever since this thread started... no hits so far.

    If you find a stash of 'em big enough to share, be sure to PM me!

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    I'd be really interested as well!

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    And what about the new "Truvativ Hammer Schmidt" from SRAM?

    http://forums.mtbr.com/showthread.php?t=392009

    Last edited by Carlos71; 07-06-08 at 12:34 PM.

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