New Cog - Your thoughts....
10-08-04 | 03:16 PM
#26
Senior Member
Joined: Sep 2004
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From: Les Bois
Bikes: Felt F2C, Scott Spark 40, and Custom Fixie
Originally Posted by shecky
IIRC, Sheldon Brown's hack wasn't actually tested. I think i'd prefer doing the Bendix two speed fixed conversion.
10-09-04 | 04:26 PM
#27
old codger
Joined: Sep 2004
Posts: 1,124
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From: Victoria B.C.
Regarding the mechanical friction losses. Yes there must be some. I mated a sturmey archer aw to a mavic ma2 on the back of my old early 80s kuwahara. I could not believe the feeling of increased smoothness and efficiency compared to the shimano 600 derailers that I removed. The hub weighs about two pounds but is a wash with the removal of all the other crap. I ride mostly in the middle gear which is the 1:1 giving me 42/18 gearing using a 1/8th chain from the raleigh.
I love scrounging and playing with things mechanical.
I love scrounging and playing with things mechanical.
10-09-04 | 07:17 PM
#28
Senior Member
Joined: Sep 2003
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From: Seattle, WA
Bikes: Surly Steamroller, Rodriguez (custom SS)
Originally Posted by Thylacine
Bostontrevor Wrote -
A lot of early safety bikes had multiple cogs on the back that you shifted when you got to a hill by stopping, losening the back wheel, putting into an easier ratio, then off you went, up the alps. I understand this was a common thing in some of the early races like the Tour De France etc, before the advent of the derailleur. I don't think there was any 'cult' or 'timetrial' aspects about it.
A lot of early safety bikes had multiple cogs on the back that you shifted when you got to a hill by stopping, losening the back wheel, putting into an easier ratio, then off you went, up the alps. I understand this was a common thing in some of the early races like the Tour De France etc, before the advent of the derailleur. I don't think there was any 'cult' or 'timetrial' aspects about it.
The sliding hub, dual rod operated, back pedal derailleur is patented on May 4th and introduced in August. The pieces of the derailleur are all handmade requiring a massive investment of time and labor.
Jim
Last edited by jimv; 10-09-04 at 07:48 PM.
10-09-04 | 07:41 PM
#29
...
Joined: Nov 2003
Posts: 457
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From: Mini Apple Us
Bikes: Merckx Miyata Barracuda!
I think it is because he converted a cassette hub to ss usage, the furthest cog actually works as a lock ring so the spacers and cog stay put.
Originally Posted by HereNT
There's a guy on our saturday rides that has two cogs on one side of his hub. Don't know the rhyme or the reason to it. I'll ask him this weekend.
10-09-04 | 07:41 PM
#30
Retrogrouch in Training
Joined: Sep 2004
Posts: 5,484
Likes: 1
From: Knee-deep in the day-to-day
Awesome! I love the old skool Campy QR (indeed Campagnolo invented QR--myth has it that he realized it after his nuts were frozen(!) crossing the Alps and couldn't switch to his other gear), too.
But for the record, those weren't my words.
But for the record, those weren't my words.
10-09-04 | 07:46 PM
#31
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From: Seattle, WA
Bikes: Surly Steamroller, Rodriguez (custom SS)
Originally Posted by bostontrevor
Agreed on all points. I was simply saying that to me it seems like missing the point.
But I'm intrigued. The ASC does apparently have a direct drive gear. I assumed that was simply a 1:1 ratio but that there would still be some sort of drag associated with the planetary gearing. I mean, I guess the hub body woud rotate at the same rate as the drive sprocket, so everything would be relatively stationary.
I dunno, I guess I don't understand enough about internally geared hubs (though I can operate one!
)
But I'm intrigued. The ASC does apparently have a direct drive gear. I assumed that was simply a 1:1 ratio but that there would still be some sort of drag associated with the planetary gearing. I mean, I guess the hub body woud rotate at the same rate as the drive sprocket, so everything would be relatively stationary.
I dunno, I guess I don't understand enough about internally geared hubs (though I can operate one!
)Jim
10-09-04 | 08:58 PM
#32
Retrogrouch in Training
Joined: Sep 2004
Posts: 5,484
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From: Knee-deep in the day-to-day
Maybe I'll do that. One of LBS's I frequent has an old skooly SA cutaway AW, but in the 15 minutes I spent dorking around with it, I didn't get it. I have an old Raleigh Sports (sans front wheel) and was going to build some sort of winter frankenbike around the rear, but the budget's tight at the moment. Maybe I should fiddle with it instead.
10-10-04 | 12:48 AM
#34
(Grouchy)
Joined: Mar 2003
Posts: 3,643
Likes: 1
Originally Posted by Ya Tu Sabes
Seems to me that if you picked your two front rings right, you could have the dual fixed cog in the back and have the same chain length, thus obviating the need to loosen the rear wheel at all (like, maybe, 42x17 and 44x15). If the chainline weren't too bad (as many have mentioned), this would be a nice way to have a very multi-purpose, multi-terrain fixie.
10-11-04 | 01:58 AM
#36
//
Joined: Feb 2003
Posts: 766
Likes: 2
Originally Posted by Thylacine
One gear centainly isn't time efficient, converting an old track frame made from 531 or Oria or some other old crap steel sure ain't light, and as for 'simple and comprehensible'.....
10-12-04 | 11:46 AM
#37
Rebel Thousandaire
Joined: Sep 2004
Posts: 733
Likes: 1
From: Hartford, CT
Bikes: Public D8, Yuba Mundo (cargo), Novara Buzz (1-speed, soon to be 2-speed w/ a kickback hub), Xootr 1-speed folder
Originally Posted by OneTinSloth
you'd still have to loosen up the rear wheel to get the chain off one cog and onto the other. unless you had a ridiculously slack chain.
I dunno - I think you could pull it off with a minimum of slack. Imagine if you had 43 x 15 and 42 x 16. When it was on 42 x 16, you would push the chain, while turning the crank, onto the 15-tooth cog, thus creating more slack, which you would then take up by pushing it onto the larger front ring. I think that so long as you did it in the right order, you could accomplish this within the normal amount of slack you want to keep your chain from binding up.
Of course, I have neither the resources nor the inclination to try this, since one speed is fine with me...
10-12-04 | 11:50 AM
#38
Senior Member
Joined: Jul 2004
Posts: 536
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From: Issaquah, WA
Bikes: 2006 Specialized Tarmac Expert, 1990 Specialized Allez Epic, Specialized RockCombo (winter), 70's Motobecane Team Champion,
This is not a new idea, it's been done before many years ago for track riders using the same bike for different events....
10-12-04 | 03:49 PM
#39
Senior Member
Joined: Jul 2004
Posts: 536
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From: Issaquah, WA
Bikes: 2006 Specialized Tarmac Expert, 1990 Specialized Allez Epic, Specialized RockCombo (winter), 70's Motobecane Team Champion,
Originally Posted by bostontrevor
For the zenness, it seems like a cheat to shift.
10-12-04 | 08:56 PM
#40
Year-round cyclist
Joined: Apr 2002
Posts: 3,023
Likes: 3
From: Montréal (Québec)
[To shift from one cog to another]
Yes, but it is easier and cleaner to do it that way than to remove the wheel and flip it around.
Originally Posted by OneTinSloth
you'd still have to loosen up the rear wheel to get the chain off one cog and onto the other.
Yes, but it is easier and cleaner to do it that way than to remove the wheel and flip it around.
04-07-05 | 02:44 AM
#42
kevinindisguise
Joined: Jan 2005
Posts: 36
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From: Valley of Hearts Delight, CA
Originally Posted by Tom Pedale
What's so Zen about a fixed gear? The sound of one gear shifting??
It should be in the top snippets of this forum whether he meant to be sage or not.
