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Massive overhaul of a folding mountain bike frame - have some rookie questions

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Massive overhaul of a folding mountain bike frame - have some rookie questions

Old 07-10-13, 12:18 PM
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Massive overhaul of a folding mountain bike frame - have some rookie questions

Hi All

I have recently started commuting to work, and have a few needs that were able to be met with the purchase of a folding bike frame. So far, this is working out, but I want to learn how to modify, build, and otherwise get to know every aspect of this project.

Goals:
1) Create a bicycle as light as possible (lots of stairs at the train station and office)
2) Create a bike that looks cool
3) Not interfering with the folding mechanism. The folding is very important
4) Have fun building and learning about bicycles

For the most part, the bike was a rusted hunk of junk, and I have successfully converted it to a single-speed design and managed to shave off over 20lbs(!) of weight by changing the crank, the handle bars, and seat. The heaviest parts now are the original stem/steering bar and the bike seat post.

The frame itself was said to weigh under 10lbs so I know there is potential to make this into a very light bicycle. I was able to learn a lot from the below thread:

Measurements and stats:
https://www.bikeforums.net/showthread...-does-it/page3


How delicate is a crank anyway? Do i need a bash-guard?
The crank often hits the floor when folded or gets slammed around on the train.

I do require a folding frame, as it will need to fit at my desk as well as within any of my friend's smaller vehicles. Here is the current state of the bicycle:




1) I would like to convert the bicycle into one with lighter road tires. Will changing the entire fork work for this? It appears to take a 1" fork. Is there any fundamental structural problem that will happen by changing this?

I was planning on only having a rear coaster brake to begin with, as there are not any hills on my return commute - just on the way to work. I really would like to ditch the stock fork. the top half is a massive steel bar. Will the proposed 700c fork have any massive issues? I want to use coaster brakes so I am alright with existing brakes not lining up.


2) Please let me know if the following parts will fit on my bicycle, and if there are any problems. My commute is only a few miles each day before I get on the train, and I would like to remove all brakes and turn it into a coaster setup, as the cables seem to always get stuck on people / car junk while traveling


Folding Pedals: https://www.amazon.com/gp/product/B00...A2TE9IQP68MWQU
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Stem: https://www.amazon.com/gp/product/B00...A2TE9IQP68MWQU - Attaches to new proposed fork, as the current one is a threaded design.
-
Back Wheel & Brake: https://www.amazon.com/gp/product/B00...=AEQL5ND4IRBUU
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Front Wheel: https://www.amazon.com/gp/product/B00...A2CP32FBOKJOOV
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Fork: https://www.amazon.com/gp/product/B00...=AJ5KCH6R81QUN - OR - https://www.amazon.com/Dimension-Cros...1%22+700c+fork to upgrade front brakes later on (weather and such)
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Protect crank when folded: https://www.amazon.com/gp/product/B00...A2RCT8MB1RT96V
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Keep 'er upright: https://www.amazon.com/gp/product/B00...=ATVPDKIKX0DER


The end result will possibly look like this:


I am okay with spending money on this project as I really want the experience of putting this custom bike together, and enjoy riding it every day.

Thank you for your help, and I am glad to have found such a great community at bikeforums

Last edited by mattveezy; 07-10-13 at 12:52 PM. Reason: organization
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Old 07-10-13, 12:39 PM
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Originally Posted by mattveezy
2) I would like to convert the bicycle into one with lighter road tires. Will changing the entire fork work for this?
I don't see how this follows. The existing fork may not be as heavy as you assume.

Anyway, it's a nice bike. Since you are considering a hub brake, you might also consider smaller wheels.
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Old 07-10-13, 12:48 PM
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What kind of wheels would you suggest? I will be entirely riding this on paved surfaces and there are not a lot of potholes by me
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Old 07-10-13, 12:53 PM
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thats a new fork and a 110 type crank , threadless stem from a threaded fork adapter

and 2 700c wheels..

Why? just change to a thinner 26" tire so the brakes still work. they will be lighter
lighter thinner rubber, Panasonic Pasela in 26 x 1.5 or less.

V brake is good. they will substitute for the cantilevers if you wish, but the change is un needed.

single cog freewheel , Pick your ratio .. what works for you?

IDK maybe a big oversize chainguard just to keep your greasy chain off the office carpet.

I need more than 1 gear , internal gear hubs work for me..

Last edited by fietsbob; 07-10-13 at 12:56 PM.
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Old 07-10-13, 12:55 PM
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Originally Posted by mattveezy
What kind of wheels would you suggest? I will be entirely riding this on paved surfaces and there are not a lot of potholes by me
Not "kind" but size. Certainly you could use 559 rims. Maybe 520s. 451s would be extreme, but possibly doable with compromises. Pick your desired tire width first.
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Old 07-10-13, 01:02 PM
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Are those smaller? I want to keep fullsized wheels. The bike will mostly only be folded to get into car trunks. I have to keep it unfolded on mass-transit and use the front-mounted bike racks that they provide 26" is nice but i am under the impression that 700c is the same size but will be faster on roads (and look better)

the existing fork has nubs on the front for V brakes, and if I am removing them i would like a nice clean front appearance - which is why I don't mind investing in a new fork if it is possible to do this.

This is my first bike build so i have a lot of rookie questions

Last edited by mattveezy; 07-10-13 at 01:08 PM.
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Old 07-10-13, 01:05 PM
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Never mind.
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Old 07-10-13, 01:05 PM
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smaller diameter wheels drop the BB clearance . bad Idea..

you can build a narrower 26" 559 rim into a light enough wheel..

Smaller wheels start over ,, get a folding bike made around having that wheel size.

Most are. bigger wheel is a folding bike size handicap.

dont change wheel sizes ... the brake s line up with just 1 rim diameter , stick to it.

but i am under the impression that 700c is the same size but will be faster on roads (and look better)
that would be a irrational aesthetic observation and impractical .

559 is not the same as 622 .. though the thinner tire makes the overal diameter similar ,

But the Brakes wont work. anymore .

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Old 07-10-13, 01:13 PM
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Originally Posted by fietsbob
smaller diameter wheels drop the BB clearance . bad Idea..

dont change wheel sizes ... the brake s line up with just 1 rim diameter , stick to it.
I would like to switch to coaster brakes. I've had the little brake wires get caught on people already on the train since my commute tends to get packed full. i have been riding around with a squeeky wheel all day since the V went out of alignment due to this

is there a resource where I can read about various wheel thicknesses on a 26" rim? I partially understand the numbers you are talking about.

Do the three amazon products (fork rear wheel and front wheel) work with my existing frame? Or would I have to start with a coaster brake and then build a wheel accordingly

Last edited by mattveezy; 07-10-13 at 01:18 PM.
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Old 07-10-13, 01:19 PM
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i have been riding around with a squeeky wheel all day since the V went out of alignment due to this
that symptom is easy to fix , once you learn how.


I'm running Magura Hydraulics on my V brake bike , they dont even use the bossas a Pivot anymore ,
just as an anchor point.
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Old 07-10-13, 04:19 PM
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i guess my main question is:

is there anything wrong with the parts that i listed - or will they not work?
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Old 07-10-13, 06:08 PM
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Fork and front wheel & tire: What you have is fine; I can't see the bike getting lighter with replacing. Go with 1.25" to 1.5" tires for lightweight and easy-rolling.

Back-wheel and brake: I suggest sticking with 26" (which I assume the frame was made for), mainly to ensure the brakes will line up. Wheel size doesn't really matter, other than the fact that your frame (and all frames) was designed for a particular rim size. Besides, going up in size (to 700c) only adds more bulk and weight. Plenty of lightweight 26" wheels (though I'm sure yours are fine) and skinny 26" tires.

Stem: There are newer 1" threaded stems that are light with modern removable faceplate available.

Bashguard: I don't see on that listing the tooth-count-equivalency. Check out these: https://bbgbashguard.com/ I have several and they're nice, strong, and a little less expensive than what you listed.

Kickstand: I much prefer the rear mounted version, which is much more stable: https://www.amazon.com/Greenfield-Sta...ield+kickstand
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Old 07-10-13, 07:02 PM
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Ok I am finally grasping this.

So for my back 26" wheel the options with coaster brakes tend to all be 26x1.75

Is this the minimum size for coasters to work?

Can I get a 26x1.5 wheel and add a coaster?

Leaving the front fork and replacing the top with a new light quill will fix a lot of the weight
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