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Brad4130 · RSS feed for topic

I'm building a 24" twin top tube freedtyle cruiser for the SF bike expo on Nov 10-13 at the Cow Palace in San Francisco .
Wile I'll have a bunch of other bikes I've built for my company this is a full documentation of a old school freestyle inspired frame build .

Today I started by laying out the custom bent / tapered twin toptubes in the JIG figuring out the best frame geo for this build . The overall team for this frame design will be part General RL with hints from a Ozone method 1 .
Along the way I mitered up the downtube to fit .

I'm also building a fork for this bike useing these components .

Stay tuned more to come , please post up your thoughts .
Thanks for looking !

DjYady · 2012-10-15 7:32pm

I'm a sucker for twin top tubes and just started looking at 24's.... subscribed!

rocs8x9x · 2012-10-15 7:34pm

skillsthebarber · 2012-10-15 8:09pm

this thing is going to be sweet. what color do you have in mind?

subscribed

Brad4130 · 2012-10-15 8:14pm

skillsthebarber wrote:
this thing is going to be sweet. what color do you have in mind?

subscribed

I was thinking black / chrome parts
I'm going to do something cool on the frame , just don't want to say anything yet

skillsthebarber · 2012-10-15 8:36pm

If you need help designing decals for your project just let me know. I have a local place that can print on clear with white too. Im always looking for a fun project to keep my skills sharp.

Brad4130 · 2012-10-18 2:50pm

I've been making small advances on this frame over the past 2 days .
I apologize for the lack of updates , I was at the shop pretty late last night .

So first off the BB shell was welded to the seat tube .
Always the first step on my frames .

I also machined a small insert for the seattube to help support the seatpost .
The tube I used for the ST is a double butted tube cut in half in the center of the thin section .
This gives you a thicker section at the bottom near the BB and tapered internally to the thinner top.
The insert extends about 2in into the thin section to create a upper butted section .

Brad4130 · 2012-10-18 3:24pm

Next up was the mitering and final file hand fitting of the downtube into the frame and layout of the twins !

After laying out the shape of the frame and tweaking my geo a bit so the seattube sat in the exact location I wanted in relation to the bends of the twins . This is when a frame can go from fugly to sexy with small tweaks !

So now it was time to fit the each toptube in the mill vise and match miter each one . Yes this was the hard way to do the work but when your making one custom and not a thousand production bikes you kinda have to do it this way to figure out the design .

After measuring twice , then double checking my setup it was time to start cutting the twins !

Now it was time to set the toptubes into the frame to check miter fit and overall look of the frame .

I'm pretty happy on how this frame is coming out .

Next up, I start fitting the chainstay's in the chain stay subassembly jig .

Burning River · 2012-10-18 3:26pm

Looks amazing so far .

mattbloke · 2012-10-18 3:45pm

This thread is full of WIN!

dirkBMX · 2012-10-18 4:19pm

Awesome fit-up!! Great job!

Brad4130 · 2012-10-18 4:22pm

I got the top tubes cut and matched perfectly .
Oh I'm starting to get excited , this bike looks like a giant Ozone !!

rocs8x9x · 2012-10-18 5:57pm

This could be best thread of the year!!!

Hot Shot · 2012-10-18 6:04pm

Cool project I hope someone builds a twin top tubes bmx one day .

Brad4130 · 2012-10-18 6:10pm

Thank you for all the comPliments on the profess so far , I'm glad I could contribute to the forum

Here's a few shots of the chainstay's in the subassembly jig .

This is basically a piece of tooling plate with machined blocks set to the required spec's of what ever style bike your planning on building .

Right now I have it set for 110 rear Bmx spacing with Clarence for a 2.25 tire .
( more on parts later , I really scored a sweet set of treads for this baby ! )
The jig holds everything flat and allows you to keep the stays fixtures in the plate for mitering ,The chainstay tubes I'm useing are 3/4" tapered to 1/2" .
Oh the funky aluminum block is there to hold the spreader in flat .

jbrown1168 · 2012-10-18 6:16pm

Yes! Fabrication. Subscribing.

GAry · 2012-10-18 6:24pm

Looking awesome, and love all the details.
Keep the good pics coming..sure you cant make another one of these?
Would really like an Ozone (inspired) 24 for the bmxmuseum

kegger · 2012-10-18 6:32pm

sweet

tomandemmy · 2012-10-18 6:58pm

hey my brother is building me a phase 1 replica. nice thread here is the progress.

Last edited by tomandemmy (2012-10-18 6:58pm)

Brad4130 · 2012-10-18 7:10pm

GAry wrote:
Looking awesome, and love all the details.
Keep the good pics coming..sure you cant make another one of these?
Would really like an Ozone (inspired) 24 for the bmxmuseum

Thanks Gary

That's a huge compliment coming from the curator of the museum .
Yes I'm sure I could be persuaded to build another , or part with this one for the right price

Here's a lil teaser on what's coming up tomorrow .
I have all these pieces on my desk , I believe with the right work they will come together into one of the coolest pieces I have ever built .

dedmann · 2012-10-18 7:36pm

are going to throw a radical gusset under the down tube at the head tube?
looks bitchn!

TuRBo Todd · 2012-10-18 8:00pm

very cool to see.

Hot Shot · 2012-10-18 11:06pm

Hot Shot wrote:
Cool project I hope someone builds a twin top tubes bmx one day .

Sorry typing error ^ Was actually trying to say that hopping someone would build a 22" twin top tubes bike one day .

RL · 2012-10-19 1:02am

Awesome Brad!

Brad4130 · 2012-10-20 12:54am

Mr. Headtube aproves of this thread !

I polished the rear dropouts to a mirror finish .

Then it was onto cutting the radius for the BB in the chainstay subassembly .

Once the radius cut was made the chainstay's were fit to the frame and dropouts .

Now it's time to stick this thing together , let's weld !!

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24" twin-top tube cruiser w/ fork - Build thread !

24" twin-top tube cruiser w/ fork - Build thread !

#2 2012-10-15 7:32pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#3 2012-10-15 7:34pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#4 2012-10-15 8:09pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#5 2012-10-15 8:14pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

skillsthebarber wrote:

#6 2012-10-15 8:36pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#7 2012-10-18 2:50pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#8 2012-10-18 3:24pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#9 2012-10-18 3:26pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#10 2012-10-18 3:45pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#11 2012-10-18 4:19pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#12 2012-10-18 4:22pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#13 2012-10-18 5:57pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#14 2012-10-18 6:04pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#15 2012-10-18 6:10pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#16 2012-10-18 6:16pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#17 2012-10-18 6:24pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#18 2012-10-18 6:32pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#19 2012-10-18 6:58pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#20 2012-10-18 7:10pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

GAry wrote:

#21 2012-10-18 7:36pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#22 2012-10-18 8:00pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#23 2012-10-18 11:06pm

Re: 24" twin-top tube cruiser w/ fork - Build thread !

Hot Shot wrote:

#24 2012-10-19 1:02am

Re: 24" twin-top tube cruiser w/ fork - Build thread !

#25 2012-10-20 12:54am

Re: 24" twin-top tube cruiser w/ fork - Build thread !

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