BO15 32" Motorbike

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This is a Lepper Primus seat, if I am not mistaken.
It is indeed.

Here's the money shots everyone has been waiting for. Here's the 32 next to my wife's 26" Schwinn:
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Holy ..... man, what are you? 6'8"
 
Crazy cool, nice work! Those pedals are looking mighty small, though. Fabbing scale pedals would be a real trick.

furyus
 
Crazy cool, nice work! Those pedals are looking mighty small, though. Fabbing scale pedals would be a real trick.
Funny you mention the pedals. I agree with you. They're not even the biggest pedals in the first place, they're just what I had on-hand. I'll definitely be on the lookout for a beefy set.
 
What a beautiful job you are doing on this. It took seeing it next to the 26" bike t realize just how big this bike is!
 
I had been using the seat as a size reference, but even that wasn't working, because the springs gave it extra dimension
 
How to do the tank? I decided to go with a method that I've used once before, which didn't work out very well the first time, but I figured I could use lessons learned to make an improved version. I first made a CAD version of the space where a tank would be.
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I then made two matching sheet metal pieces that size and shape. Next I cut 1" tubing in half, and joined the two halves together to make a vessel which would be a total of 1" wide, and is 1" larger than the space.
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I then TIG welded it completely tight, which I forgot to take pictures of. After grinding all of the welds smooth as best I could, I then cut the thing into two halves, leaving me with these:
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Next will be to work on the way to attach them in a non-permanent way.
I have a plan.
 
That tank is looking good! And that spring saddle fits on this build, they always look so out of proportion on a standard 26 er build.

How's the gear ratio pedaling with those big hoops? I can't remember how big your cog and chain ring are?
 
Those tank halves.....I may be calling you for a custom tank in the future....

This bike is just awesome, mind you, at less than 5’ 10”, I’d never be able to ride it, but dang dude!


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That tank is looking good! And that spring saddle fits on this build, they always look so out of proportion on a standard 26 er build.

How's the gear ratio pedaling with those big hoops? I can't remember how big your cog and chain ring are?
You are totally right about those saddles. I bought it four years ago, and it's always looked oversized until this build, so I was happy to use it.

The gear ratio is fine, though I might want to end up putting the next size up I've got on the rear cog to make it a touch easier. I took it for a 10 mile ride yesterday though, so it's not bad.
 
I used some angle iron tacked into the tank to make sure it stays in place.
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I've had these car (I think?) emblems for a while, hoping to put them on a vintage bike tank at some point, so I figured now is the time.
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Then I welded some nuts on the angle, giving me a place to bolt the other half onto. Overall, I'm pretty happy with how it came out, though I do wish that I had the shaping forms to allow the bolt to seat right on the tank.
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I used some angle iron tacked into the tank to make sure it stays in place.
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I've had these car (I think?) emblems for a while, hoping to put them on a vintage bike tank at some point, so I figured now is the time.
View attachment 121135
Then I welded some nuts on the angle, giving me a place to bolt the other half onto. Overall, I'm pretty happy with how it came out, though I do wish that I had the shaping forms to allow the bolt to seat right on the tank.
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46-48 Chevy stylemaster.
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Tank looks good, and now I don't have to figure out a way to make one. Your way looks like it works just fine.
 
Wow! I havent been catching up in class 2 for a while! Beautiful build, the fact that this is a large cruiser.

I actually miss a large 28"/29" cruiser on the market. This is even a 32!

Your wife's "medic" cruiser is real nice too!
 
How to do the tank? I decided to go with a method that I've used once before, which didn't work out very well the first time, but I figured I could use lessons learned to make an improved version. I first made a CAD version of the space where a tank would be.
View attachment 120964


Is that CADboard (said with Boston Southie accent).
 
  • Haha
Reactions: Fv2
EXCELLENT methodology and work on that tank!!!!
 
How to make the chain guard? For my first scratch-built guard, I decided to keep it flat and simple. I carefully cut out the picture of the chain guard on my scaled template, and transferred that to steel. I then made a strip to be on the top. BUT! Rather than weld them together on the front side, I make the call to weld them on the back side, thus giving me more meat when I used my grinder to shape a curve between the two sides. I think it came out great, actually.
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Next will be attaching it to the bike.
 
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