Built a SUB (stand up bike)
 

I was given a 24" wheel MTB in decent condition and wanted to try and make a SUB (stand up bike) Removed the top tube and most of the seat tube. Dropped the top of the rear triangle and braced to the main tube. Made a stem from 30mm stainless tubing and a hinge to fold the bars, fits easily in the back of my car. All gear mech removed and chain tensioner made. Cranks cut down to 90mm, gives a much better pedalling action. Technique is a bit different than riding a normal bike, like climbing stairs but you're getting somewhere, I tend to pedal and coast, head wind is a killer. I use it on the local bike trails which are quite flat (old train tracks) so single speed works. Turned out better than I thought it would.https://cimg1.ibsrv.net/gimg/bikefor...26fb5630ca.jpg

Original frame
https://cimg5.ibsrv.net/gimg/bikefor...1664de7d8e.jpg

Frame cut down
https://cimg1.ibsrv.net/gimg/bikefor...d0c83c4f1c.jpg

Painted black
https://cimg3.ibsrv.net/gimg/bikefor...8b7f065ce4.jpg

Folding bars
https://cimg5.ibsrv.net/gimg/bikefor...87a562d58a.jpg

Hinge
https://cimg1.ibsrv.net/gimg/bikefor...ea7448c42f.jpg

On the trail

Real nice work there, Foxonabike. :thumb:

90mm cranks sure seem short and low on leverage to me. Is that a common crank length for stand up bikes? :)

I don't think so, but the action is really good. And they are a thing.

https://www.ebay.ca/itm/SUNLITE-FORG...0AAOSws8Zad4sc

True, they are a thing. I thought that size of crank was originally designed for kid's bicycles.

The real question is how it works with your sprocket gearing and if the short cranks make stand up pedaling more stable for the rider? And what speed range is that bike able to cruise at?

I have no idea personally, but I am curious how well it works for you? :)

I must have short legs or something but it feels good, it did raise the gearing a lot so I increased the rear sprocket by 2 teeth. Definitely makes it more stable for me. I'm not sure on the speed, maybe 15k ? not high speed but a real hard workout on the legs.

A really nice build. More than I can do, that's for sure. Looks like great fun. :D

Just one question. Why ? Because you can , I guess . :)

Exactly, messing with stuff is my thing

i've noticed trials bikes made like that. is that what you do?

No, never tried trials, but the bikes do look neat. Going to try a bigger rear sprocket (+ 3 teeth) just to see what it feels like, got to add a link to the chain though for that :rolleyes:
And I do have another 24" wheel MTB, it has an alloy frame so is pretty light, I would have used it for the stand up but wouldn't be confident doing any welding on it, might be time to try a trials :foo:

Looks like a cool project, good work!

That's cool. Does it rock side to side much when pedaling?

Yes, a bit like this I can keep my upper body completely still but it is much harder on the legs and core, certainly a good workout, got some riser bars to try as well to see if higher bars feels better.

,,,,,,,,,, your work looks really good , final product great, what's the longest ride youve done on it ? That's really all leg work do you miss the seat any ?

10K is a good workout, don't miss the seat on this, it's just a different way of riding (is it riding without a saddle ?)

Nice one, it is way better than mine...

Fun! As a fan of Fixed Gear, I would recommend trying Fixed Gear. Without a run - out, it would be even more fun!

Looks real cool

Very cool. thanks for sharing

Your efforts results are very fruitful.