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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 12-01-11, 08:15 PM   #1
syncromark
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Single speed ... +1?

This is my first post: be gentle. I've been riding my single-cross for about a year with 42/18 ratio. Love it, except the 'normal' bike guys fly by me on the flats and downhills. What if a guy could easily add another ratio [say 54/18] just by changing his left crankarm, and adding a chain [using flip-flop hub] ... and what if he could shift on the fly, by clicking a lever with his toe. Not for purists, and maybe [maybe] slight weight penalty ... but if the price were right, what do you think? Would anyone bite?

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Old 12-01-11, 08:19 PM   #2
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http://en.wikipedia.org/wiki/Hub_gear
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Old 12-01-11, 08:22 PM   #3
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Old 12-01-11, 08:24 PM   #4
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Wait, wait. Think about it, every photo would be drive side.
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Old 12-01-11, 08:26 PM   #5
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There's a Swiss outfit called Schlumpf that makes a two speed crankset with a foot shifter, but they cost around $700 and I have no idea where you'd get one in the US.
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Old 12-01-11, 08:35 PM   #6
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OR

you can get an internal 3 speed

or weirder, you can ride with two chain rings, a front derailer, and rear derailer - for chain tension. then you'll ride and think about the wonders of 5,6,7,8,9,10,11 gears
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Old 12-01-11, 08:40 PM   #7
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riding two different drive cranks with differing q factors must be good for your knees
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Old 12-01-11, 08:43 PM   #8
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it depends, like so many other things cycling
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Old 12-01-11, 09:02 PM   #9
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Imagine the bottom bracket size.....
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Old 12-01-11, 09:23 PM   #10
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This reminds me of a thread a while back: A small drive side freewheel and a large non drive side freewheel on backwards with a two sided crankset. High ratio for accelerating and low ratio for decelerating. High top speed with good stopping power. Somehow it got proved impossible though
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Old 12-01-11, 09:47 PM   #11
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LOL
most perfect gif ever
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Old 12-01-11, 10:10 PM   #12
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Youd either have to find an old tandem crank, or risk unthreading your pedal.
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Old 12-01-11, 11:28 PM   #13
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Youd either have to find an old tandem crank, or risk unthreading your pedal.
And find a freewheel that works in the opposite direction, *and* then engineer a way to lock/unlock them on the fly...
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Old 12-01-11, 11:43 PM   #14
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What if a guy could easily add another ratio


Sorry man, I think somebody beat you to that.



Duh.
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Old 12-02-11, 12:23 AM   #15
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I remember seeing one crazy rig that had a normal freewheel on the right side and a "backwards" freewheel and a reverser gear on the left side, so that if you pedaled forward you had one gear and if you pedaled backwards you had another gear, that was still a forward gear.
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Old 12-02-11, 12:52 AM   #16
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I remember seeing one crazy rig that had a normal freewheel on the right side and a "backwards" freewheel and a reverser gear on the left side, so that if you pedaled forward you had one gear and if you pedaled backwards you had another gear, that was still a forward gear.
I believe you are thinking of a "retro-direct drive" bike

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Old 12-02-11, 12:55 AM   #17
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Youd either have to find an old tandem crank, or risk unthreading your pedal.
not that i am condoning any activity in this thread but we have got a tandem in our family that has had non tandem crank arms for almost 20 years. the bike has more miles on it than i care to imagine and no pedal has ever come loose. keep in mind the stokers right hand pedal is the only "correct" pedal of the four.

i read in one book that the only reason pedals were revers threaded to begin with was to prevent ankle breakage on a bike with no freewheel. if the pedal bearings lock up your pedal theoretically will unthread from the crank arm. on a bike with a freewheel (like our tandem) you would just stop pedaling. regardless of the reason, a properly installed pedal will run "backwards" for thousands and thousands of miles with no issue. i have tried and tested proof. yes, i am fully aware of sheldon browns stance on the topic...

italian bottom bracket cups are also right hand thread on both sides. once again, properly installed they wont back out.

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Old 12-02-11, 07:58 AM   #18
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Agreed. A pedal installed with the correct amount of torque isn't going to somehow magically unthread by pedaling in reverse.
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Old 12-02-11, 09:02 AM   #19
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white ind double/double
and the double chainring works well with a dingle cog if you want fixed
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Old 12-02-11, 09:34 AM   #20
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My dingle setup I ran on my fixed on/off-road go-anywhere fixed gear was a Sugino RD2 crank w/ Surly 39 and 42t chainrings and a 17/20t Surly dingle track cog on a Formula fixed hub w/ a 9-speed chain. Everything lined up, nothing rubbed, and 3 of 4 ratios were useable for a given length of chain and the amount of slack the dropouts on my Cross-check could take up. That was a super fun, versatile setup. Commute during the week, hit trails and long gravel rides on the weekend, etc. A bit heavy tho, given the amount of steel on the drive-train (2 Surly chainrings and a Dingle cog), but that bike certainly wasn't a featherweight.
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Old 12-02-11, 10:16 AM   #21
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here's another 2 speed you can pedal backwards to get a lower gear on from jan heine's book.

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Old 12-02-11, 11:07 AM   #22
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Thanks for the input! To summerize, I'm hearing: snore,wtf? and, why? To a lesser degree, I'm hearing: a few people have played with different ways of doing this, which says there's at least some minimal interest in the world.
To clarify a few points: the idea is to create a robust, simple, clean, retro-fit-able, selectable-on-the-fly, inexpensive 1+1 speed.
My idea uses no fussy, expensive, delicate planetary gears in either hub or bottom bracket, nor long chain or droopy tensioner/deraliuer. It uses an untouched stock bottom bracket, common flip-flop hub and [latest rev] standard [but modified] left-side crank arm, i.e., standard left pedal threads. And no pedalling backwards.
Would sell for < $100.
I'm on the 3rd revision ... putting miles on the bike [Portland, OR], and it works great. I think a giant single chainring on the 'wrong' side looks awesome, but admit that it's subjective ... you have to look pretty hard to even notice the bilateral drive, and then it's a fun 'wtf' conversation. And of course I now blow by other single-speeders if it's flat or downhill ... which was the whole point.

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Old 12-02-11, 11:55 AM   #23
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And of course I now blow by other single-speeders if it's flat or downhill ... which was the whole point.
You are not riding a singlespeed bike. In fact, I think you're missing the entire point of riding ss.

A regular geared bike is no heavier and has a lot more gearing flexibility than yours.
Even this is a much more elegant solution and still has 3 gears
http://www.bikesdirect.com/products/...kilott_s3x.htm
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Old 12-02-11, 12:48 PM   #24
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That Mercier IS very cool, and elegant ... and you're right, i miss-spoke when i said OTHER single-speeders: mine is no longer. Further, I genuinely appreciate the candid responses to my query: I asked for it!

Having said that, let me say this: your [anyone's] 'entire point' of riding a ss is probably different than my 'entire point'. My 'entire point' is: simplicity, robustness, uniqueness and speed. [And somewhat surprisingly: cardio conditioning - much better workout for me now that I can push myself beyond the 42/18t spinning speed.] My invention only intends to address these -unique to me - constraints. My question was: is it interesting to anyone else?

You're undoubtably a more experienced and serious cyclist ... I'm driven by a compulsion to make things better [for me] and unique: I'm an industrial designer, and I happen to cycle as one of my interests.
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Old 12-02-11, 01:48 PM   #25
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42x18 - no wonder you're so slow on the flats.
so get a bigger chainring or smaller cog. $15-$60. Problem solved.

I thought your entire point was to blow by ss riders on the flats and downhill?
If it's now simplicity, robustness, speed and being unique... well you failed on 3 of the 4.

Just because you're an ID doesn't mean it's a good idea.
I'm an ID too, i've had more bad ideas than good- but sure was passionate about it at the time.
Fun to try stuff out and out of the box thinking and maybe this will be a stepping stone and lead to something worth developing.
It's all a process but you also should look at how the compromises outweigh the benefits and if it's actually an improvement at all.

just my lame opinion
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