zoom26

Guys Questions
I have a 2014 Dahon Vybe c7a and planning to upgrade the crank on it

Then I came across this online :

Shimano 5700 105 Groupset parts with Less than 100 miles, Just broken in and look clean (For those who can't Google what 5700 parts are- All parts are 10 speed) :
*Crankset- with BB -Bottom Bracket (Hollowtech 68mm English Thread),and is a Compact 50/34 with a 170mm arm length. Crank is only 796grams! Selling for $60
*Front Derailleur- 31.8mm, 100grams, Selling for $20
*Rear Derailleur- , 225 grams, Selling for $30, OR ALL 3 PIECES OF THE GROUP FOR $85


Is this gonna be compatible with my 2014 Dahon Vybe c7a, seller wants to know what Bottom Bracket I have, whether it's English,Italian and other stuff that I didn't understand. Can you guys tell me if the crankset he's selling would fit/work with my dahon? Seller wants me to take pictures of the BB, but I don't know what he wants to look at.


Thanks in Advanced guys!

HGR3inOK

Do you plan to do the installation yourself? Or is someone else going to do it?

-HANK RYAN-
Norman, Oklahoma USA

ThorUSA

I think if you asking these questions, this rather big mod project is going to be a problem.
Lets say this fits... you will need a different chainring as 50 is way too small.
no derailleur will be able to shift from 38 to 53 ....
no front hanger
no tools to get old bottom bracket out and new one in

I don't want to sound like an asshat but rather preventing you for spending lots of money and than bring it to the shop and spend some more and only use half of the stuff in the end

just get a square axle crankset with a single ring

jur

+1

Why do you want to upgrade in the first place? Do you need a different sized chainring?

Fitting a front derailer on a small-wheeled bike that didn't have one is a job which I rank as one of the most difficult ones on a bike (that includes building a wheel which isn't all that hard, just a bit tedious).

I don't want to discourage you out of doing it, just to be aware that what you are tackling here is a major job requiring expert knowledge.

zoom26

planning to go to a shop for it

zoom26

i'm sorry, i really have no idea on what you're talking about the parts. I'm planning to buy the parts then go to a shop for the labor, i'm not sure what other alternative you can suggest to help me on uphill rides and not suffering too much on speed. My average on my folder is about 20-25mph downhill, 6-10mph uphill and 13-16mph on flats, though my computer only says 10mph. i believe when i called you before you suggested an origin8? i've read somewhere that unless you change your squared tapered to something like a hollowtech that performance gain would only be minimal?

zoom26

on the first question,

to help me on the hills around me (New York)

on the second questions.
not really sure what that means .

thanks for the feedback

jur

Discuss what you need here, not what you think you need. There are lots of helpful people here who are Dahon experts (I'm not one of them) who would be able to make specific recommendations to suit your needs. Forget the groupset deal, the front derailer won't fit. Spell out what your problem is, eg your gears don't go low enough? Fitting a different crankset probably won't make a difference, unless the chainring (that is the front cog) has fewer teeth compared to the current one.

If you do need a front derailer, Thor would be able to suggest a bracket for a derailer suitable for your Dahon. You should expect to invest a fair sum for the bike shop willing to do this job.

There is a website blog by someone who has upgraded everything on his Dahon, that is a good place to see what is involved.
https://handsonbike.blogspot.com.au/2013/03/guide-to-upgrading-your-dahon-tern.html

zoom26

That is the site/post that i went to, that is why I'm considering the Shimano 105 since it was mentioned there. I have a fd adapter coming in the mail in the next day or so. I think one of my main concerns is just to help me going uphill, or maybe it'll just get better once my fitness gets better? Thank you so much for the feedback!

desastar

Hi,
I have done similar upgrade on my Vitesse. I suspect you won't be able to swap over the cassette easily as yours might be a freewheel and not cassette. Your Vybe appears to have a 46t chainring at the front, so if you want to be able to go faster, you'll need at least a 53t. You might be better off as someone said earlier, just to go for a square taper cranks, single speed as you'll have enough low range there. You can buy front clamp on derailleur brackets probably via ebay?

Here's a picture of my Dahon with Shimano Sora cranks with 50t. It now has a 53t chainring fitted. Out the back is a 11-27 10 speed cassette with Tiagra derailleur. If you want more gears, you may need to change the rear hub or upgrade wheels, more $$. I'd say do the front crank first and see if that fixes your issues?

zoom26

Can you advice me with what parts you put into your crank? With the exact part numbers if you don't mind. I don't see you have a fd, so you don't shift it? I think a 53t would actually make it harder for me to go on my hills? BTW is this a 7 speed initially? I think my friend has the same bike and he upgraded to a 2x18 set

HGR3inOK

I strongly suggest you take it to a shop for advice BEFORE you purchase any parts. FWIW, at our shop, our Labor Rate sheet specifically states that our posted rates assume any needed parts will be purchased from us. We implemented that policy after several instances where customers brought in "new" parts that were not compatible or were missing some item.

We offer a written "Repair Estimate" service for $15.00. We provide an itemized estimate for the work, and the $15.00 applies to work set out on the estimate. If the customer wants to provide parts, the estimate is appropriately revised.

-HANK RYAN-
Norman, Oklahoma USA

zoom26

I asked some places, the shop i purchased it from is charging 50 for labor given that i purchase the parts from them so around $200 without the fd/shifter . Some local shop is asking around 150$ but they're gonna be putting cheaper mtb parts. and another shop,NYCEWheels is gonna charge a by hour rate.

ThorUSA

there is no way a shop can do half of what you are planning for 50 dlr....
its more than 200 bucks .... plus parts you will need extra

Lets start from the basics
you can have easy uphill ..... meaning smaller front chainring
or faster downhill.... meaning larger chainring
You cannot have both .... unless you go double in front , which is as Jur said a very complicated and involved mod ... a usual bike shop, will probably not able to do that correctly, as long as they do not LOVE foldies and work on them all the time.

if you want to mod that bike....
first is a all alloy crankset like the origin8 I am selling ... add a chainring of your choice and voila ... a shop can install this for 50 bucks
Second is a real cool set of wheels.... the lighter the better....

zoom26

i meant 50usd for the labor, so all in all around 200usd but without the fd,adapter and shifter. can you provide me the name of the origin 8 crank that you're selling ? and everything that i might need? also, that i came across is a dual drive system sram but i don't seem to find prices for them and not sure again on the compatibility. Maybe it's all in my head too and i just need to upgrade my fitness not my bike hehe
Again, thanks for the advice

HGR3inOK

See: Special Parts Dahon Tern and others (scroll down)

FWIW, my shop does not stock this crank. If we did, it would be priced at $89.99 or higher.

-HANK RYAN-
Norman, Oklahoma USA

desastar

Sorry don't have the part numbers but which you were planning to buy should fit. Sounds like you want both very high and very low gearing. Depending on whether your fd bracket will fit and what will your chain line be with the existing rear freewheel, it may or may not shift well. You may be better off selling this bike and upgrading if you can't do the work yourself.

desastar

Yes, I do have a double chainring but I didn't need the low ranges hence did not fit the fd. I've now removed the smaller chainring, so its a 10 speed.

bhkyte

The other approach is dual drive hub. More expensive with a new hub, adds weight over the FD approach but offers 36% increase and decrease in gears and ability to shift at a stand still. Heavier option, and can be difficult to accommodate click box.

jur

Schlumpf Speed Drive. Perhaps too costly though. BruceMetras might be able to help with that.

zoom26

I saw the Nuvinci N360 that comes with the Dahon Mu N360.
nuvinci n 360 | eBay

Saw one for 150$ don't know if that is complete enough. I rode last night, and thinking if i do need the upgrade. Maybe it's just all in the head, and i'll ride more comfortably in time

ThorUSA

question ?
how long do you own your bike ? how many miles ?
Asking cause you might be surprised how nice the bike feels after a little bit of usage.....

I am the first to applaud modding ..after all its a substantial part of my business .... but sometimes its much better to start real small, and than slowly work your way up to bigger projects, all while you find out what tool you need and such

thor

HGR3inOK

Based on your other posts in this forum, I am guessing that you will need someone to build a wheel for you if you purchase this unit. And I am guessing that you will need someone to install the wheel and shifter on your Vibe C7A. I strongly recommend you get a price for this work BEFORE making this type of purchase. Where did you get your Dahon Vibe C7A? Perhaps they can help you with your modifications.

-HANK RYAN-
Norman, Oklahoma USA

fietsbob

depends .. AW3 gears are 4/3 in high, 33%, and 3/4 in low - 25%. S-A has a hybrid internal/cassette combo now..
Sachs/Sram slightly different ..

Sheldon Brown's Bicycle Gear Calculator

If you can score a Sachs 7 by 3, on that Auction site, they used a pull chain , rather than the Click box

of the current 8, 9,10 speed cassette capable Sram hubs..

ThorUSA

its like one can after the other ..lol
Internal hubs require a dropout which allows the axle to slide forward and back ... Think BMX bike
The Vybe has regular dropouts ...
meaning internal hubs wont work .... UNLESS you also install a chaintensioner .... and than I am not so sure that the chain will not skip ...

as I said ..... enjoy the bike a little longer
than make one little step after the other

If you have to modify your bike to make a Nuvinci hub work ... You honestly will spend as much as I sell the complete bike for ...
( almost anyhow )

thor