Building a 12 pound fixed speed bike. Possible?
11-25-17, 08:55 AM
#27
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I really want one, do a ten mile ride out to a camp spot, rucksack and a few bags on the bike, take my time enjoying the scenery. Or just something to ride around to the pubs on, be a right laugh.
11-25-17, 09:55 AM
#28
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Good source and mechanism of frame is holding me back
Hi Guys,
I'm going to do this! But what's holding me back is a good reputable frame supplier. The only sub $600 sub 1500g are from China and just reading through people's experiences its a minefield between dodgy sellers and the blame game if the item gets damaged in transit.
Can anyone suggest a good source and a good mechanism (I believe this should be Ebay due to its protection for buyers).
I'm going to do this! But what's holding me back is a good reputable frame supplier. The only sub $600 sub 1500g are from China and just reading through people's experiences its a minefield between dodgy sellers and the blame game if the item gets damaged in transit.
Can anyone suggest a good source and a good mechanism (I believe this should be Ebay due to its protection for buyers).
11-25-17, 11:52 AM
#29
Calamari Marionette Ph.D
I think the novelty would wear off by the time I got to the end of my street. It would be great inside a factory or warehouse.
11-25-17, 11:58 AM
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1587g for the Aventon Diamond frameset with Carbon seatpost and full carbon fork.
Depending on color, you are priced from $299-$499.
https://www.aventon.com/collections/...d-frames-bikes
Depending on color, you are priced from $299-$499.
https://www.aventon.com/collections/...d-frames-bikes
11-25-17, 12:06 PM
#31
Calamari Marionette Ph.D
1587g for the Aventon Diamond frameset with Carbon seatpost and full carbon fork.
Depending on color, you are priced from $299-$499.
https://www.aventon.com/collections/...d-frames-bikes
Depending on color, you are priced from $299-$499.
https://www.aventon.com/collections/...d-frames-bikes
11-25-17, 12:19 PM
#32
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Probably as close as he will get for his price range and not wanting to go the China route...
11-25-17, 12:27 PM
#33
Calamari Marionette Ph.D
11-25-17, 04:42 PM
#34
~>~
With modern lightweight CF road frames built w/ vertical dropouts, 13O rear spacing and press-fit bottom brackets how are you planning to accommodate adjusting/tensioning the chain on a re-purposed FG with those specs?
-Bandera
edit for spacing error
-Bandera
edit for spacing error
Last edited by Bandera; 11-25-17 at 06:29 PM.
11-25-17, 06:12 PM
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There's a couple different methods... White Industries makes a hub with an eccentric axle, it probably comes in 135mm but you could probably space it if needed. I think Sheldon Brown or someone has a "perfect gear" calculator that will match up gear combos for a specific chainstay length.
11-25-17, 06:47 PM
#36
~>~
There's a couple different methods... White Industries makes a hub with an eccentric axle, it probably comes in 135mm but you could probably space it if needed. I think Sheldon Brown or someone has a "perfect gear" calculator that will match up gear combos for a specific chainstay length.
Getting an acceptable chainline on a FG conversion should be priority #1 in planning this project. If the drivetrain wont function it doesn't matter what the machine weighs. This used to be a simple task w/ steel frames that were, or could be cold set to, track standard 120 spacing, horizontal dropouts w/ the length needed to tension the chain and threaded bottom brackets w/ many spindle lengths available for a perfect chainline. Eccentric hubs and BBs are available but with the wide press-fit BB shell, short chainstays and 130 spacing on modern CF road frames I'd work all of those issues out before spending a $ on the project.
I'd certainly ride a 12LB FG CF road frame conversion on my LD/FG rides w/ all of the modern doo-dads if done properly.
Good luck, sounds interesting.
-Bandera
11-25-17, 06:56 PM
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Meant 130, sorry 'bout that.
Getting an acceptable chainline on a FG conversion should be priority #1 in planning this project. If the drivetrain wont function it doesn't matter what the machine weighs. This used to be a simple task w/ steel frames that were, or could be cold set to, track standard 120 spacing, horizontal dropouts w/ the length needed to tension the chain and threaded bottom brackets w/ many spindle lengths available for a perfect chainline. Eccentric hubs and BBs are available but with the wide press-fit BB shell, short chainstays and 130 spacing on modern CF road frames I'd work all of those issues out before spending a $ on the project.
I'd certainly ride a 12LB FG CF road frame conversion on my LD/FG rides w/ all of the modern doo-dads if done properly.
Good luck, sounds interesting.
-Bandera
Getting an acceptable chainline on a FG conversion should be priority #1 in planning this project. If the drivetrain wont function it doesn't matter what the machine weighs. This used to be a simple task w/ steel frames that were, or could be cold set to, track standard 120 spacing, horizontal dropouts w/ the length needed to tension the chain and threaded bottom brackets w/ many spindle lengths available for a perfect chainline. Eccentric hubs and BBs are available but with the wide press-fit BB shell, short chainstays and 130 spacing on modern CF road frames I'd work all of those issues out before spending a $ on the project.
I'd certainly ride a 12LB FG CF road frame conversion on my LD/FG rides w/ all of the modern doo-dads if done properly.
Good luck, sounds interesting.
-Bandera
I will stay tuned to see how this pans out if the OP persists... I hope they keep us posted.
11-25-17, 08:53 PM
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The Cinelli Parallax is pretty light (claimed 1500g for the frame) if you can still find one.
11-25-17, 09:18 PM
#39
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Isn’t that the one with massive toe / front tire overlap ? Not the best choice IMO for general riding, especially for someone unfamiliar with fixed gear riding.
11-25-17, 10:03 PM
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Yeah, well a 12lb build is also not the best choice IMO, so I'm really just indulging the ridiculousness of it.
11-26-17, 08:42 AM
#41
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Late to the party again 
Well, OP, as mentioned previously - the only thing holding you back is dollars (and imagination too, I suppose).
Try searching more around this subforum - IIRC there is(was?) a poster in this group who has the discontinued super-lightweight Gates-drive crabon Trek SS on which he spent a lot lightening it even more.
Admittedly, I have some weight-weenie tendencies myself and just for s***zngiggles, occasionally build-up my own roadified steelie track bike as a "lightweight". Not a single bit of crabon, and besides my slightly higher-end frame and fairly light wheelset, none of the other bits are particularly light or expensive, and it still comes in a hair over 15 lbs...
Well, OP, as mentioned previously - the only thing holding you back is dollars (and imagination too, I suppose).
Try searching more around this subforum - IIRC there is(was?) a poster in this group who has the discontinued super-lightweight Gates-drive crabon Trek SS on which he spent a lot lightening it even more.
Admittedly, I have some weight-weenie tendencies myself and just for s***zngiggles, occasionally build-up my own roadified steelie track bike as a "lightweight". Not a single bit of crabon, and besides my slightly higher-end frame and fairly light wheelset, none of the other bits are particularly light or expensive, and it still comes in a hair over 15 lbs...
11-26-17, 01:11 PM
#42
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1587g for the Aventon Diamond frameset with Carbon seatpost and full carbon fork.
Depending on color, you are priced from $299-$499.
https://www.aventon.com/collections/...d-frames-bikes
Depending on color, you are priced from $299-$499.
https://www.aventon.com/collections/...d-frames-bikes
But my ALU CAAD 12 frame is 1100grams and a cheap CF roadbike frame from China is 900 grams (see https://www.bikeforums.net/road-cycl...rame-bike.html 3rd post).
So why aren't there 900gram CF track framesets?
11-26-17, 01:32 PM
#43
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See this what I don't get. That frame is 1600grams.
But my ALU CAAD 12 frame is 1100grams and a cheap CF roadbike frame from China is 900 grams (see https://www.bikeforums.net/road-cycl...rame-bike.html 3rd post).
So why aren't there 900gram CF track framesets?
But my ALU CAAD 12 frame is 1100grams and a cheap CF roadbike frame from China is 900 grams (see https://www.bikeforums.net/road-cycl...rame-bike.html 3rd post).
So why aren't there 900gram CF track framesets?
11-26-17, 02:19 PM
#44
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See this what I don't get. That frame is 1600grams.
But my ALU CAAD 12 frame is 1100grams and a cheap CF roadbike frame from China is 900 grams (see https://www.bikeforums.net/road-cycl...rame-bike.html 3rd post).
So why aren't there 900gram CF track framesets?
But my ALU CAAD 12 frame is 1100grams and a cheap CF roadbike frame from China is 900 grams (see https://www.bikeforums.net/road-cycl...rame-bike.html 3rd post).
So why aren't there 900gram CF track framesets?
Why is it always roadies that get a bug up their ass for a FG/SS/Tarck bike who make such a big deal about having one that is ultra-light? Using the rationale that since their alu or crabon wunderbikes are so light to begin with, that a bike without gears or brakes should be proportionally even lighter?
First - Having ridden a buddy's Caad 10 (which was a nice bike), I doubt your claim earlier in this thread that your 105 equipped Caad 12 weighs 17 lbs is accurate and is more likely optimistic by at least a pound or two.
Second - I see that same 1100g weight claim you made for the frameset everywhere - but without substantation, and not being made by C'dale themselves...so perhaps your premise is not based in reality.
Finally - what TenGrainBread (and multiple others) said
All that being said - for your purposes, maybe you ought to look into a Caad 10 Track. It was pretty expensive, and apparently didn't sell very well so not long ago was being dumped all over the place for 1/2 price - but it seems right up your...alley.
Good luck...
11-26-17, 04:09 PM
#46
~>~
11-26-17, 04:12 PM
#47
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Seriously, the sooner you realize that an ultra lightweight track frame is completely pointless, the easier this will be.
11-26-17, 08:24 PM
#49
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I really feel like there ought to be an event for these bikes - fixed-gear hill time trials so that people who want to put drillium in the titanium have a raison d'etre.
