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Old 09-06-17, 11:03 AM   #1
mtb_addict
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How easy to upgrade to Double Chainring?

I hear that for touring, some people say double chainring is a must...because you want to avoid big jumps in the gearing...to find that sweet spot for optimum performance...especially since I am planing on riding a back-2-back-2-back centuries.

So how easy is it to DIY upgrade a Vybe D7 to become D14?

P.s. I'm a po' boy...so keep in mind I want to do it as cheaply as possible.

Last edited by mtb_addict; 09-06-17 at 11:08 AM.
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Old 09-06-17, 12:22 PM   #2
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The spec sheet is rather sparse.
So I'm guessing a bit.
- a new, longer BB
- a front derailer
- a front shifter
- a new crankset

Finding a crankset may be tricky.
Due to the small wheels, the bike may have a bigger-than-average chainring. Might be difficult to find a crankset with an appropriate tooth count difference.
If you're OK with your high gears, it might be possible to retrofit a smaller chainring inside the current chainring.
Finding a way to mount a front derailer might be tricky.
If there is a double chainring model available, have a look at what parts that model uses.
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Old 09-06-17, 12:49 PM   #3
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Quote:
Originally Posted by dabac View Post
The spec sheet is rather sparse.
So I'm guessing a bit.
- a new, longer BB
- a front derailer
- a front shifter
- a new crankset

Finding a crankset may be tricky.
Due to the small wheels, the bike may have a bigger-than-average chainring. Might be difficult to find a crankset with an appropriate tooth count difference.
If you're OK with your high gears, it might be possible to retrofit a smaller chainring inside the current chainring.
Finding a way to mount a front derailer might be tricky.
If there is a double chainring model available, have a look at what parts that model uses.
Wow...sounds like a headache with the crankset. Maybe I just sell my bike and buy a new one with double chainring.

Who makes the cheapest double chainring 20" folder?
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Old 09-06-17, 12:57 PM   #4
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Quote:
a new, longer BB
...(unless the
Quote:
- a new crankset
fits on the existing one) .. wide variation there, no standards

Quote:
- a front derailer .. - a front shifter
Or, "Greasy-Finger shifting" you just replace the crankset..

to down shift you can derail the chain with the heel of tour shoe, while you pedal,

the greasy part is stopping and moving the chain back to the big ring.. bring a rag, or gloves..


Alternative is a planetary geared crank-set chain ring is connected to the gear box not the crank arm,
so they can be turning at different rates...

but the chain remains on that one ring..






.....

Last edited by fietsbob; 09-06-17 at 01:44 PM.
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Old 09-06-17, 01:01 PM   #5
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I read in the cycling press a company in Poland has crowd funded a start up, that is making a 3 speed geared crank

physical gear 28t, overdrive gears effectively a 40, & a 50t.
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Old 09-06-17, 01:09 PM   #6
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Originally Posted by fietsbob View Post
Or, "Greasy-Finger shifting" you just replace the crankset..

to down shift you can derail the chain with the heel of tour shoe, while you pedal,

the greasy part is stopping and moving the chain back to the big ring.. bring a rag, or gloves..

I guess you have to be careful not to pops off the chain from chainring completely. Since there's no stop to it.
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Old 09-06-17, 01:34 PM   #7
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Originally Posted by mtb_addict View Post
I guess you have to be careful not to pops off the chain from chainring completely. Since there's no stop to it.
It's a Knack, without stopping, no doubt... there are 'chein jump stops' made,, of various styles.. sold..
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Old 09-08-17, 04:06 PM   #8
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You might find a sach dual drive wheel for very little cash used on Ebay.
Much better than a double chain ring for a folding bike.
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Old 09-09-17, 10:26 AM   #9
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I run a 2 speed internally geared crank, on my Brompton..
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Old 09-09-17, 02:59 PM   #10
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Difficult and expensive unless you're mastering your own workmanship with your bike... Total cost for pieces and labor isn't worth the getback. If you plan a long tour with varying terrains, the most cost-optimized solution is to sell your current foldie and buy another with double chain ring such as Dahon Visc D18.
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Old 09-11-17, 05:05 AM   #11
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Visc D18 is one way. Clamp on Derailleur another.

Quote:
Originally Posted by mtb_addict View Post
Wow...sounds like a headache with the crankset. Maybe I just sell my bike and buy a new one with double chainring.

Who makes the cheapest double chainring 20" folder?
You can get clamp on derailleur hangers plus derailleurs though they are commonly for smaller seat tubes.

The Vybe, no question, is a high value bike for the money. The Visc D18 and Mu D10 are as well however. If riding 2 back to back centuries is your goal I might say that a Mu SL11 could be a reasonable solution is that it is a fast setup with 451 wheels as well.

I've got a new Mu Sl11 as well as Viscs available if you want to go that route.

If you upgrade the Vybe do get a sealed bottom bracket. Look at your chainline so that you can have reasonable alignment between chainrings and your rear cogs. If you get a bigger chainwheel you will likely need to add to or replace your chain as it will likely need more length.

You would enjoy a bike swap I'll bet.
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