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Need help building a single speed

Old 02-08-18, 11:43 AM
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Need help building a single speed

Hey guys,

I have two 2016 Specialized Allez DSW Sprint bikes, one complete, other frameset. I would like to build the frameset into a cool single speed with some Chinese aero wheels, and a MB flat bar. Any suggestions for drivetrain, wheels, brake caliper, would be appreciate it. Thanks!
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Old 02-08-18, 11:52 AM
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Are you going to try a magic gear combo or use a tensioner?

Are you going for flashy or stealth or tech?
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Old 02-08-18, 11:57 AM
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I think that's an oversize BB shell, so you can use an eccentric BB to adjust tension. See https://wheelsmfg.com/category-holdi...-brackets.html
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Old 02-08-18, 12:09 PM
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what are you going to do with the single speed? Depending on how you are going to use the single speed you might be better off trading this for a frame more suited to a) single speed b) how you are going to use the bike c) what comfort level you want

the drop on this frame has no adjustability, whic is good for indexing, bad for single speed so will almost for sure need a tensioner.


cool is in the eye of the beholder, and I fully admit to being a classic guy so I but I think there would be cooler/better suited frames than this for a single speed ... ymmv
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Old 02-08-18, 12:17 PM
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+1 That's a huge waste of aero frame and wheels. The gear ratio required for the speed at which aero becomes significant is far higher than would be comfortable on a single speed. bike, not to mention that a flat bar position significantly offsets the aero as well.
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Old 02-08-18, 01:03 PM
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I would not use a tensioner. Vertical dropouts means that an eccentric bottom bracket is the way to go. This will limit the choice of cranks. Black SRAM Omniums would be nice with the Wheels Mfg eccentric bottom brackets linked above.

That bike has 130 mm dropout spacing while fixed gear/single speed wheels are typically 120 mm. A Single speed conversion kit will be required to adapt the cassette on a road wheel. Kits are $20 or $30 but the sprockets are usually crap and you likely won't find one for a 1/2" width chain.

I'd sell the frame and get a carbon track frame cheap from China. Build it fixed, not freewheel. Fixed is the way to go.

Watch the Olympics. Track bikes can be ridden fast. Aero matters on track bikes. 48x16 gearing and 20 MPH all day long, or at least for an hour. I agree about the flat bar though. I nice 3T aeronova drop bar would be sexy.

But yeah, get a chicarb track frame and sell that thing. Or a Planet X frame. Or just buy a Wabi steel bike.


-Tim-
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Old 02-08-18, 01:10 PM
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Originally Posted by caloso
I think that's an oversize BB shell, so you can use an eccentric BB to adjust tension. See https://wheelsmfg.com/category-holdi...-brackets.html
It may be oversized, but the bearing opening is not. The eccentrics you linked need a LOT bigger hole in the shell than I see there in the photo.
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Old 02-08-18, 01:12 PM
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It's not a waste to build that up. Folks never ask one the purpose of the build or the bike, but yet have a strong opinion without having all the information available or even riding a bike like that at speed. Incredible. I have built up a couple of framesets (vertical drops) in a similar fashion. The first was a Litespeed Tuscany in which I ended up getting Zipp to build a rear ENO hub onto a 404. That way I could use a standard BB for my shell. It worked out very well. The other was a Lemond Buenas Aires that I made into a training bike with a set of converted* Spinergy Rev X carbon tubulars. In both cases they were fixed as I pretty much train that way. It sounds like you want to buy a Chinese carbon wheelset and if this is so you can go with either a tensioner or eccentric BB. Chainline will be easy as you can space your rear cog very easily on that freehub. It's more work when you puncture but you could go with the eccentric BB if you are concerned about how clean the bike looks. BTW, don't listen to the haters. I now train with a Chinese full carbon aero track bike with those 88mm Chinese carbon clinchers with a 54x16/14 and it is quite wonderful. Every bike suits a purpose and some folks will never understand.




*with a Surly Fixxer

Last edited by fixedweasel; 02-08-18 at 01:16 PM.
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Old 02-08-18, 03:23 PM
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Originally Posted by Leisesturm
It may be oversized, but the bearing opening is not. The eccentrics you linked need a LOT bigger hole in the shell than I see there in the photo.
Specialized is confusing as hell about their bottom brackets, because they'll list them as OSBB, with that actually meaning a number of different actual BB standards. On that frame, it's normal BB30, so you could use https://wheelsmfg.com/category-holdi...nks-black.html with a Sram Omnium, for example.

I think the OP is clearly going for a slightly silly fashion bike. His money--probably be pretty fun. For running single speed you can just use a spacer kit on a normal road wheel, or for a more trick solution, build up a 130mm spaced FG/SS hub, like a Surly Ultra New, or add spacers and possibly a new axle on a cup and cone track hub; White Industries and Chris King also make appropriate hubs.

If you have any trick road cranks that are either hollowtech or gxp I'd go ahead and use them with a new ring on the wheels eccentric bb, otherwise use Sram omnium is the go to nice crank that'll work in an eccentric bb. You can also use a 1x Sram GXP crank. If you get the Omnium get a 1/8" chain and frewheel/cog, otherwise I'd get a 3/32 chain, chainring, and freewheel/cog because they are more than strong enough, a bit lighter, more easily found, and often cheaper.

For brake calipers avoid Shimano because they have their own cable pull ratio, go Sram or Tektro or whatever with whatever SHORT PULL flat bar levers you want. Naturally use a carbon pad compatible with the rims you're using.
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Old 02-08-18, 03:29 PM
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cool bike, you most probaly also dress like Robin Hood with expensive Spandex ...

but I'd love to ride and then see you in the yonder as I will peddle till my nose bleeds so as to pass you at speed

if you build a bike looking like that, I hope that you are fast as everyone is going to want to race you
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Old 02-08-18, 03:46 PM
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Originally Posted by TimothyH
I would not use a tensioner. Vertical dropouts means that an eccentric bottom bracket is the way to go. This will limit the choice of cranks. Black SRAM Omniums would be nice with the Wheels Mfg eccentric bottom brackets linked above.

That bike has 130 mm dropout spacing while fixed gear/single speed wheels are typically 120 mm. A Single speed conversion kit will be required to adapt the cassette on a road wheel. Kits are $20 or $30 but the sprockets are usually crap and you likely won't find one for a 1/2" width chain.

I'd sell the frame and get a carbon track frame cheap from China. Build it fixed, not freewheel. Fixed is the way to go.

Watch the Olympics. Track bikes can be ridden fast. Aero matters on track bikes. 48x16 gearing and 20 MPH all day long, or at least for an hour. I agree about the flat bar though. I nice 3T aeronova drop bar would be sexy.

But yeah, get a chicarb track frame and sell that thing. Or a Planet X frame. Or just buy a Wabi steel bike.


-Tim-
Didn't you know fixies are not mass market cool any more OP said cool
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Old 02-08-18, 05:17 PM
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Yea , chain tensioner and any freewheel hub rear, will work*.. IDK what mechanical skills they have ..
you can pay people in LA to make it ready to go..

Flatbars, ** Skinny tires .. Magura Urban .. they make excellent Hydraulic Rim brakes.. single bolt, time trial caliper,
uses the same levers as my HS33 (which is their V brake post . mounted version .. best rim brakes I've used.. (rear might not fit)
so then nevermind....

*Your mechanic, can, with threaded axles always change the axle length, and swap spacers around to dial in the chainline..

** given your tastes a carbon MTB bar..



..

Last edited by fietsbob; 02-08-18 at 05:25 PM.
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Old 02-08-18, 06:12 PM
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My reaction to this project is that you wish to build a sow's ear using a silk purse as material. The frame is a poor choice for building a single speed
This in no way means that I am against single speed bikes, I have one that is 90% built, but every time I think about finishing up, I wonder how much I will actually want to ride it.
Think about how much effort and money that would be spent making this project work. It could be done with less effort using a suitable frame and would be less costly.

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Old 02-08-18, 08:45 PM
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...*


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Old 02-08-18, 09:12 PM
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This isn't a high end bike. It is tig welded alloy.

https://www.specialized.com/us/en/bi...t=#result-list


The bike in the background looks fancy because it has lots of upgraded parts but the frame is alloy. Specialized slapped fancy paint on the framesets, called them "Special edition" and jacked the price.

You guys acting like it is a Venge or a Cervelo C5 or something. It was marketed as a cheap, light, stiff and disposable crit bike. Given what it is, if the OP wants to turn it into single speed then he should go for it.


-Tim-

Last edited by TimothyH; 02-09-18 at 08:12 AM.
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Old 02-09-18, 06:47 AM
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Originally Posted by TimothyH
Watch the Olympics. Track bikes can be ridden fast. Aero matters on track bikes. 48x16 gearing and 20 MPH all day long, or at least for an hour.
OK, you have a point. The OP would reap some benefit on a track, or on a level time trial course in a race limited to one-speeds. Somehow I don't think he is planning to race, though.
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Old 02-09-18, 08:10 AM
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Originally Posted by cny-bikeman
OK, you have a point. The OP would reap some benefit on a track, or on a level time trial course in a race limited to one-speeds. Somehow I don't think he is planning to race, though.

I ride a fixed gear bianchi pista on 60 mile group rides with regular road bikes.

A fixed gear or single speed bike can be ridden on the roads just like any other bike and will benefit from aero as much as any other bike.


-Tim-

Last edited by TimothyH; 02-09-18 at 08:15 AM.
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Old 02-09-18, 08:36 AM
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Originally Posted by TimothyH
I ride a fixed gear bianchi pista on 60 mile group rides with regular road bikes.

A fixed gear or single speed bike can be ridden on the roads just like any other bike and will benefit from aero as much as any other bike.


-Tim-
I agree and I think that it's a cool frame, especially paired with aero wheels. Aero also helps at slow speeds and uphill, if that's your thing. Aero frame is a small part of that though, maybe the smallest.

That said, when I've personally looked at converting to single speed I always come down finally to it's just better to start with a single speed frame in the first place, and skip the hassles of converting. If you want matching frames or something else specific, as apparently in this case, that may be a different story.
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Old 02-09-18, 09:19 AM
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Originally Posted by wphamilton
When I've personally looked at converting to single speed I always come down finally to it's just better to start with a single speed frame in the first place, and skip the hassles of converting. If you want matching frames or something else specific, as apparently in this case, that may be a different story.

I have two single-speed bikes (and used to have three). I got rid of my Norco Heart because I met someone who simply had to have it but I still have one of the wonderful chromoly Gary Fisher TRITON single-speed track bikes that Trek built and my fair-weather ride is a big ugly black VISP. The thing that they all have in common is that they were all factory-built and properly engineered from the ground up to be single-speed bikes, as opposed to what is most common around here, namely one-speed bikes that were built from 10-speed racers (some with cottered cranks !) that were cobbled together in someones basement or garage in order to get an extra hundred dollars for a low-end steel frame bike.

I (also) think that "it's just better to start with a single speed frame in the first place" if you want predictable results and a bike you will actually ride.

We have 6 inches of snow on the ground and 5 inches more forecast for the next 24 hours and I envy all of you who have bare roads and warm sunny weather today.

https://www.dropbox.com/s/u9jsgseyrn...0copy.JPG?dl=0

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Old 02-09-18, 10:50 AM
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Originally Posted by alcjphil
My reaction to this project is that you wish to build a sow's ear using a silk purse as material.
That's the coolest part of this project - a truly unique bike.
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Old 02-09-18, 11:21 AM
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Originally Posted by TimothyH
I ride a fixed gear bianchi pista on 60 mile group rides with regular road bikes.

A fixed gear or single speed bike can be ridden on the roads just like any other bike and will benefit from aero as much as any other bike.


-Tim-
We occasionally see FGs on our local flat race ride, either track bikes or road conversions. All with brakes, of course. That's good training. I might like to do that myself.
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Old 02-09-18, 11:27 AM
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Vertical rear dropout makes it unsuitable for fixed gear..

structure around BB is big, but the BB shell may not be like a Tandem, Front BB , which would be eccentric enough..




..

Last edited by fietsbob; 02-09-18 at 11:34 AM.
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Old 02-09-18, 11:42 AM
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And FWIW, I've done a magic gear FG before. You can find calculators online that will help you figure out what chainring/sprocket combos will work, but it's pretty kludgy.
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Old 02-09-18, 01:16 PM
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Originally Posted by fietsbob
Vertical rear dropout makes it unsuitable for fixed gear..

structure around BB is big, but the BB shell may not be like a Tandem, Front BB , which would be eccentric enough..


..
It is OSBB which is the same as PF30. An eccentric bottom bracket from Wheels Mfg will work fine.

https://wheelsmfg.com/eccentric-bb-f...nks-black.html


-Tim-
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Old 02-09-18, 01:28 PM
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Originally Posted by caloso
We occasionally see FGs on our local flat race ride, either track bikes or road conversions. All with brakes, of course. That's good training. I might like to do that myself.

If I could offer encouragement it would be to show you my 2015 Bianchi Pista - Dura Ace brakes and drivetrain, 1400 gram wheels, Vittoria/Thomson/Fizik, Nitto bar and stem, SRAM levers. 48x16 is my normal gear.

Thursday nights during summer I sometimes join the 20+ MPH out and back paceline ride. At the end of last summer they were going so fast that I had to swap the 16 tooth sprocket for a 15 tooth just because I was spinning up to 130 RPM. It got a little scary.




I'm >this< close to swapping the frame for a Columbus Spirit tubed Wabi Lightning SE.

There are some expensive bits on this bike but a fixed gear bike doesn't have to be expensive. Performance was selling Fuji Feather's for $299 last year.


-Tim-

Last edited by TimothyH; 02-09-18 at 01:31 PM.
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