(MBBO#05 Class 2) GET SMART!

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24 down to 20 should drop you half of the difference, or approximately 2 inches... on paper.

Carl.
 
GuitarlCarl said:
24 down to 20 should drop you half of the difference, or approximately 2 inches... on paper.

Carl.
Click to expand...
Actually as you are only dropping one end, and the bb is approximately halfway down the length of the frame, it is probably half of the single tire difference, so not 2", but 1"...

Luke.
 
GuitarlCarl said:
24 down to 20 should drop you half of the difference, or approximately 2 inches... on paper.
Click to expand...
LukeTheJoker said:
Actually as you are only dropping one end, and the bb is approximately halfway down the length of the frame, it is probably half of the single tire difference, so not 2", but 1"...
Click to expand...
The reasoning sounds right, but the missing variable is the tires. That's why I'd be interested in the original wheel/tire hight if Brian still has it.

(Read with the voice of Maxwell Smart)... Well Chief, I measured a 24" Mt. bike that I have on hand and came up with 11 1/2" from ground to center of the axel. The 20" wheel and (fat) tire that I've got is 10 3/4". That works out to be 3/4" shorter at the drop out. Using Luke's formula it would only be 3/8" at the bottom bracket. Now, take that and factor in the angle of the slot in the drop out and it's conceivably possible for there to be no difference depending on the location of the axel in the drop out for each size wheel/tire combination! :nerd: :whew:
Get_smart.jpg


...So to answer Luke's original question, the frame height and angle should be virtually the same for all practical purposes. :grin:
 
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I tossed the tires when I parted out the bike. I'll have to wait until I'm at my office to measure the wheels for you.
The tires that were on it would probably be pretty close in height to your MTB 24" wheels.
 
kingfish254 said:
I tossed the tires when I parted out the bike. I'll have to wait until I'm at my office to measure the wheels for you.
The tires that were on it would probably be pretty close in height to your MTB 24" wheels.
Click to expand...

No need, I was just curious about the height with the tires. Thanks anyway! Like you said, it's probably close to the same.
 
Using stock crank and pedals? I'll bet it changes more than you think... but it won't be unmanageable. An inch or so change in ride height at the crank shouldn't scrape too bad except deep into the cornering.

Carl.
 
Carl, you may be right. I wish I had the original specs to know for sure.

I mounted the wheels and rolled it out to compare it to my 20" Schwinn Scrambler. I found that the BB on both bikes are almost exactly the same. However, the crank arms are shorter on the Schwinn. It (the Schwinn) measured 4 1/2" from the pedal to the ground and the Smartbike is 3 1/2". Who knows what the Smartbike measured originally.

I lined up the two front axels for a side by side comparison. They are very close in size but the Smartbike has far more leg room! You can also get an idea of just how much taller the rear tire is. I didn't think to point the cranks down. The seat on the Schwinn is raised about as high as possible and is in a good riding position for me.
Get Smart compare.jpg
 
Wow that looks cool with the 20 on the back. 20 x 1 3/8 would look sweet on the front IMO but I'm sure you have a plan already...:D

Totally want one of those frames now. Love the way it lines up with the Stingray. The later long frame Stingrays are fairly roomy and you've got a lot more with that bike.

Plenty of ground clearance. The later Schwinn frames are pretty high at the bb. Fastbacks and short stingray frames are pedal draggers from the factory.
 
The Renaissance Man said:
The reasoning sounds right, but the missing variable is the tires. That's why I'd be interested in the original wheel/tire hight if Brian still has it.

(Read with the voice of Maxwell Smart)... Well Chief, I measured a 24" Mt. bike that I have on hand and came up with 11 1/2" from ground to center of the axel. The 20" wheel and (fat) tire that I've got is 10 3/4". That works out to be 3/4" shorter at the drop out. Using Luke's formula it would only be 3/8" at the bottom bracket. Now, take that and factor in the angle of the slot in the drop out and it's conceivably possible for there to be no difference depending on the location of the axel in the drop out for each size wheel/tire combination! :nerd: :whew:
Get_smart.jpg


...So to answer Luke's original question, the frame height and angle should be virtually the same for all practical purposes. :grin:
Click to expand...
:21: Gold! :41:
The Renaissance Man said:
Carl, you may be right. I wish I had the original specs to know for sure.

I mounted the wheels and rolled it out to compare it to my 20" Schwinn Scrambler. I found that the BB on both bikes are almost exactly the same. However, the crank arms are shorter on the Schwinn. It (the Schwinn) measured 4 1/2" from the pedal to the ground and the Smartbike is 3 1/2". Who knows what the Smartbike measured originally.

I lined up the two front axels for a side by side comparison. They are very close in size but the Smartbike has far more leg room! You can also get an idea of just how much taller the rear tire is. I didn't think to point the cranks down. The seat on the Schwinn is raised about as high as possible and is in a good riding position for me.
View attachment 33137
Click to expand...
That looks awesome!
Any chance you could get me some measurements on a diagram of the frame?
I am thinking about gearing up to build 5 or so production frames, and this looks like a great candidate for inspiration!

Luke.
 
The Renaissance Man said:
Carl, you may be right. I wish I had the original specs to know for sure.

I mounted the wheels and rolled it out to compare it to my 20" Schwinn Scrambler. I found that the BB on both bikes are almost exactly the same. However, the crank arms are shorter on the Schwinn. It (the Schwinn) measured 4 1/2" from the pedal to the ground and the Smartbike is 3 1/2". Who knows what the Smartbike measured originally.

I lined up the two front axels for a side by side comparison. They are very close in size but the Smartbike has far more leg room! You can also get an idea of just how much taller the rear tire is. I didn't think to point the cranks down. The seat on the Schwinn is raised about as high as possible and is in a good riding position for me.
View attachment 33137
Click to expand...
I'm sold on this concept. Love the dimensions. Really cool.
furyus
 
I knew there was a cool muscle bike hidden in that frame when I first saw it on craigslist. I'm liking the stance so far. As far as skinny 20" slicks, there are a few that people run on Dahon and Bike Friday bikes.
 

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