20 inch bicycle build

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mapbike

mapbike

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Mar 14, 2010
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nice work, Ive had thoughts on doing a 20" bike since I built my first bike back in 2009 and still haven't taken time to do one...

What tooth number sprocket do you have on rear wheel?

I was thinking about using a 30 or 32T if I motorized a 20" bike.

the bike is turning out real good looking.
 
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Larry Trotter

Larry Trotter

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mapbike said:
nice work, Ive had thoughts on doing a 20" bike since I built my first bike back in 2009 and still haven't taken time to do one...
I

What tooth number sprocket do you have on rear wheel?



I was thinking about using a 30 or 32T if I motorized a 20" bike.



the bike is turning out real good looking.
Click to expand...
I have a 32 on it now and just ordered a 28 for it.
 
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mapbike

mapbike

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Mar 14, 2010
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Larry Trotter said:
I got 27 on level ground. That is why I am going to a 28 tooth.
Click to expand...
Kool, well that may put you it 30mph without any other changes.

and if the extra noise wouldnt bother you, adding an exhaust that flows better and hetting the carb foe it would likely give you several more MPH if you wanted even more.

Jist drilling some extra holes in the end cap on yhe stick type exhaust has added some noticeable power and a couple extra MPH on some engines I've run in the post.

Well tuned carb and free flowing exhaust has always made a huge difference when I wanted to get all an engine was capable of without more internal work.

But, honestly I bet 30 mph on a 20" bike is gonna be sipping right along...LOL

I look forward to hearing how well the 28T does on your setup.

Beat wishes and happy safe riding
 
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mapbike

mapbike

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Mar 14, 2010
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Larry Trotter said:
I had to shorten the muffler about 2 inches because the end was lower than the bottom of the frame. Didn’t want to hit something with it.
Click to expand...

I seen that and it looks good and if a little more noise wouldnt bother you, you could drill about four 3/8" holes in the end cap and potentially get another 1-2 mph out of it and you may notice it gets to tip speed a little quicker also and will pull hills a bit better.

That was my experience so just sharing.

You did a dang good job on that bike... I really like the way it turned out...!
 
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Larry Trotter

Larry Trotter

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I am putting a little better spring seat on it along with a very small luggage rack on the back that should look nice on there. This is the third and best one I have built. Surprised me how well it turned out.
 
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Larry Trotter

Larry Trotter

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Nov 26, 2017
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Just waiting on a new seat and to change the 32 tooth rear to a 28 and I think it’s finished. Think I really did need the little luggage rack on the back to balance out the lines of it. This thing really is fun to ride.
0FB21214-1805-4B69-BCEF-48D26391F869.jpeg
 
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mapbike

mapbike

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Mar 14, 2010
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Central Area of Texas
I really like the looks of your bike... Ill have to say just as someone else said in and earlier post, that bike makes the little china girl engine look right in the frame.

It all simply works well in every way in my opinion.

Really nice work...
 
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