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What crankset is most appropriate for this bike?

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What crankset is most appropriate for this bike?

Old 06-29-18, 07:59 PM
  #1  
Abu Mahendra
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What crankset is most appropriate for this bike?



BB bracket is 68mm BSA. Please suggest something that is actually obtainable relatively easily. No exotica, or rarities.
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Old 06-29-18, 08:03 PM
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I'm more concerned about 3 big holes in the top tube.

As for crankset, so many choices. Partially depends on your gearing requirements.
Style ? Vintage ?
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Old 06-29-18, 08:06 PM
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Something with a large chainring I assume. Looks like the front derailleur bracket may limit your range. I know you can get them at places like bikefriday that will fit many common cranksets... https://store.bikefriday.com/index.php?cPath=67
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Old 06-29-18, 08:46 PM
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I am going to point to a Spécialités TA Carmina crank, with the smallest possible bolt circle for the spider. It is effectively a modern version of the TA Cyclotouriste crank.
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Old 06-29-18, 08:54 PM
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Anything silver.
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Old 06-29-18, 08:59 PM
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Originally Posted by Homebrew01 View Post
I'm more concerned about 3 big holes in the top tube.
-----


+ 1

air conditioning?

venturi effect?

​​​​​​​-----
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Old 06-29-18, 09:01 PM
  #7  
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Originally Posted by Aubergine View Post
I am going to point to a Spécialités TA Carmina crank, with the smallest possible bolt circle for the spider. It is effectively a modern version of the TA Cyclotouriste crank.
Oh, look, an actual answer, a relevant suggestion. Thanks. TA Carmine looks good, but they are nearly impossible to source where I am.

I've got a VO Grand Cru Drillium on hand, so unless something else pops up, I may go with that...


*
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Old 06-29-18, 09:13 PM
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Sun XCD with the single 3 lobe chainring. Or double, like this:



Or, hollow chromed steel BMX cranks. You'd need what BMX people call a "euro" bottom bracket, which is the same as BSC.



And some sort of crazy BMX "sprocket" (chainring). There's an immense variety.

Last edited by Salamandrine; 06-29-18 at 09:17 PM.
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Old 06-29-18, 09:24 PM
  #9  
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Originally Posted by Salamandrine View Post
Sun XCD with the single 3 lobe chainring. Or double, like this:



Or, hollow chromed steel BMX cranks. You'd need what BMX people call a "euro" bottom bracket, which is the same as BSC.



And some sort of crazy BMX "sprocket" (chainring). There's an immense variety.
Very nice.
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Old 06-29-18, 10:18 PM
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Something, anything, as long as it has a 100 tooth chain ring - something almost as large in diameter as the wheels.

Those holes in the top tube are BAD news for the structure. I don't think there is a worse place for them.
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Old 06-29-18, 11:43 PM
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Obviously, the geometry is different from a full-sized bike; @Abu Mahindra, I'm curious how high the center of the bottom bracket is above the ground, as the bike currently sits? On my bikes it seems to range between 26-28cm mostly. If yours is a lot lower than that, I would look for any crank with short arms, 165mm or less. The idea being with the shorter the crank arm, the less likely you'll be to to have a pedal strike while pedaling around a corner. That Grand Cru crank you have looks pretty sweet.

And yeah, that top tube is deeply into WTF territory.

Seriously, WTF?
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Old 06-30-18, 01:34 AM
  #12  
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Originally Posted by Lascauxcaveman View Post
Obviously, the geometry is different from a full-sized bike; @Abu Mahindra, I'm curious how high the center of the bottom bracket is above the ground, as the bike currently sits? On my bikes it seems to range between 26-28cm mostly. If yours is a lot lower than that, I would look for any crank with short arms, 165mm or less. The idea being with the shorter the crank arm, the less likely you'll be to to have a pedal strike while pedaling around a corner. That Grand Cru crank you have looks pretty sweet.

And yeah, that top tube is deeply into WTF territory.

Seriously, WTF?
The BB height with 37-451 tires is 28cm. Don't worry, I am fairly confident I have more experience building and riding small wheel bikes and minivelos than anyone on this channel.

Cheers...
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Old 06-30-18, 01:38 AM
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Originally Posted by Abu Mahendra View Post
The BB height with 37-451 tires is 28cm. Don't worry, I am fairly confident I have more experience building and riding small wheel bikes and minivelos than anyone on this channel.

Cheers...

Well, you certainly have more experience than me.

With that kind of normal BB clearance, I guess whatever crank your legs like is the best to use.

From your unedited original response, by "burly steel rings" do you mean the holes are reinforced by a steel insert; sort of like how spoke holes on alloy rims are reinforced by an eyelet? I am intrigued. More details on this frame, please, I've seen a few threads on mini velos, but I've never seen anything quite like this.
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Old 06-30-18, 01:56 AM
  #14  
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Originally Posted by Lascauxcaveman View Post
Well, you certainly have more experience than me.

From your unedited original response, by "burly steel rings" do you mean the holes are reinforced by a steel insert; sort of like how spoke holes on alloy rims are reinforced by an eyelet? I am intrigued. More details on this frame, please, I've seen a few threads on mini veils, butI never seen anything quite like this.
Yes, there are rings in the holes, and on tapping in the area around the holes on hears a much lower thud and little resonance than in the middle of the top tube.

The bike is a Bannard Super Racing frameset. Bannard is a now defunct Taiwanese company that won a handful of design awards in Asia during its brief life. I managed to get my hands on three of their minivelos before they expired.

Super Racing
​​​​

Sunny



​​​
Tension-R
​​​​​
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Old 06-30-18, 03:43 AM
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I would love a mini velo.
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Old 06-30-18, 04:16 AM
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Thread moved from C&V to Bicycle Mechanics.
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Old 06-30-18, 04:50 AM
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Originally Posted by Bianchigirll View Post
I would love a mini velo.
Do it. They are lots of fun. Due to the smaller wheels , they are highly maneuverable and agile, and accelerate like a rocket. And you'll be riding something unique.
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Old 06-30-18, 04:57 AM
  #18  
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fyi...

the OP question was with regards to aesthetics, not mechanical compatibility.
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Old 06-30-18, 07:56 AM
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Originally Posted by Abu Mahendra View Post
The BB height with 37-451 tires is 28cm. Don't worry, I am fairly confident I have more experience building and riding small wheel bikes and minivelos than anyone on this channel.

Cheers...
I don't think anyone here is trying to challenge your experience, knowledge, opinions, or statements. Nor will we, I hope. We are using our experience to try to assist you with your question.

Big holes in the frame are unusual in most of our experiences. I believe they can be engineered well. If you're saying they are a characteristic of a frame design that is successful in the field, fine with me.

Crankset recommendations need a few considerations in a frame where there is little familiarity. Engineering-wise, there are three basic considerations:

1. Are there any new constraints on the crankarm length? Since you said the BB height (I understand BB center height) is 28 cm, that 's fine, no major concern.
2. What is the upper limit on the chainring size?

For the same top gear, a small-wheel frame needs a big chainring. If the chainring is to be a double, you need a derailleur and your frame has a braze-on to install the front derailleur. The height from the BB center to the bottom of the slot in the front mech braze on is (my measurement on a steel road bike, filter it accordingly) is 143 mm, which accommodates up to a 54 tooth big ring with the required 2 mm spacing between chainring and derailleur cage. For a commensurate small wheel/large chainring, It should scale up to perhaps 28 cm, to get road bike gearing.

I'm assuming your road wheels have a diameter ⅔ of a 700c, or 18 inches (no idea if this matches your frame, just a guess). The large chainring would be not in the neighborhood of 52 teeth, but 78 teeth. Your front braze on would have to be more like 210 millimeters up from BB center.

So if you are using derailleur gearing as is my initial assumption, you would need the braze-on located about 210 millimeters up from the BB center. The crank therefore needs to supply a big enough chainring.

I can't say this is all applicable, but as an engineer this is step one to understanding the question you've asked.

Unless your question is really, black or silver? For that I say "silver," since I always do.
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Old 06-30-18, 08:01 AM
  #20  
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Originally Posted by Bianchigirll View Post
I would love a mini velo.
I saw a Tern that was awfully nice!
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Old 06-30-18, 08:02 AM
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Originally Posted by Road Fan View Post
I don't think anyone here is trying to challenge your experience, knowledge, opinions, or statements. Nor will we, I hope. We are using our experience to try to assist you with your question.

Big holes in the frame are unusual in most of our experiences. I believe they can be engineered well. If you're saying they are a characteristic of a frame design that is successful in the field, fine with me.

Crankset recommendations need a few considerations in a frame where there is little familiarity. Engineering-wise, there are three basic considerations:

1. Are there any new constraints on the crankarm length? Since you said the BB height (I understand BB center height) is 28 cm, that 's fine, no major concern.
2. What is the upper limit on the chainring size?

For the same top gear, a small-wheel frame needs a big chainring. If the chainring is to be a double, you need a derailleur and your frame has a braze-on to install the front derailleur. The height from the BB center to the bottom of the slot in the front mech braze on is (my measurement on a steel road bike, filter it accordingly) is 143 mm, which accommodates up to a 54 tooth big ring with the required 2 mm spacing between chainring and derailleur cage. For a commensurate small wheel/large chainring, It should scale up to perhaps 28 cm, to get road bike gearing.

I'm assuming your road wheels have a diameter ⅔ of a 700c, or 18 inches (no idea if this matches your frame, just a guess). The large chainring would be not in the neighborhood of 52 teeth, but 78 teeth. Your front braze on would have to be more like 210 millimeters up from BB center.

So if you are using derailleur gearing as is my initial assumption, you would need the braze-on located about 210 millimeters up from the BB center. The crank therefore needs to supply a big enough chainring.

I can't say this is all applicable, but as an engineer this is step one to understanding the question you've asked.

Unless your question is really, black or silver? For that I say "silver," since I always do.
I clarified in post #18 that the thread, posted originally on the Vintage & Classic channel, was about aesthetics, not mechanical limitations, compatibility or gearing.

Last edited by Abu Mahendra; 06-30-18 at 08:08 AM.
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Old 06-30-18, 08:32 AM
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Originally Posted by Abu Mahendra View Post
I clarified in post #1 8 that the thread, posted originally on the Vintage & Classic channel, was about aesthetics, not mechanical limitations, compatibility or gearing.
I take your point, but I think you should have made such a basic clarification in post #1 . Given that you didn't and I responded without reading the whole thread, I think my response was reasonable.

If it wasn't about mechanics, why did you allow the moderator to move it to Mechanics?
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Old 06-30-18, 08:40 AM
  #23  
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Originally Posted by Road Fan View Post
I take your point, but I think you should have made such a basic clarification in post #1 . Given that you didn't and I responded without reading the whole thread, I think my response was reasonable.

If it wasn't about mechanics, why did you allow the moderator to move it to Mechanics?
Allow the moderator? i was not consulted. the moderator took it upon him/herself to move it without checking with me first.
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Old 06-30-18, 08:52 AM
  #24  
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Money no issue?

Compass Cycles Rene Herse classic Reproductions https://www.compasscycle.com/product...onents/cranks/

but no 60t chainrings
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Old 06-30-18, 05:26 PM
  #25  
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Originally Posted by fietsbob View Post
Money no issue?

Compass Cycles Rene Herse classic Reproductions https://www.compasscycle.com/product...onents/cranks/

but no 60t chainrings
Very nice too, but more that i wanna spend...
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