Custom Board Track Racer

[a.tab56]

Hi All,

Looking to build a custom Board track racer frame in the style of Paul Brodie's excelsior bike. I made a model of the frame and was wondering if anyone could see any glaring issues with the frame design. I still have to design a jig to put the frame together. The prefabricated pieces I'm going to buy are the head tube, bb shell, seat stay tubes, and chain stay tubes. I am planning on putting the model in Ansys for FEA so the design might change a bit. Tubes are 4130 chromoly. I own a flux core welder but I've seen online that this can change the properties of the metal so I'll probably have a shop tig weld it for me. I don't need the welds to look pretty I'm just don't want the frame to fold in on me. The frame is built for 26in rims and I'm planning on have pretty thick tires. I've taken a motorcycle safety course and got my license and since then have been riding a motorized bike around my school campus to and from home. The engine I'm planning on using on this is a Honda gc160 from a pressure washer. I know this project isn't necessarily road legal but as long as I obey speed limits in my town no one really minds. I appreciate any constructive criticism or comments. I'm sure I'm missing some stuff so please let me know.

 

[Gordy]

Too bad the one guy in here who really had the board track look down left. If you want to go a little cheaper and easier you can use an older woman's bike and just cut the upper tube and weld it in to the top. But it sounds like you have a plan on the frame and looks pretty sick to me. What engine are you going with?

 

[Gordy]

Oops, I read the post and somehow didn't see where you said your gonna use a Honda GC engine lol

 

[Gordy]

I dig the track style dropouts. I made some for a bike frame that I still need to finish lol. Maybe I'll put one of my Briggs engines on it lol.

 

[a.tab56]

I dig the track style dropouts. I made some for a bike frame that I still need to finish lol. Maybe I'll put one of my Briggs engines on it lol.

Thanks! Yeah I'd love to see what you did with the design. Did you tig the frame together? What do you think of flux core welding on chromoly?

Too bad the one guy in here who really had the board track look down left. If you want to go a little cheaper and easier you can use an older woman's bike and just cut the upper tube and weld it in to the top. But it sounds like you have a plan on the frame and looks pretty sick to me. What engine are you going with?

That is a bummer. Does he still have a profile to look at? Maybe I could get some info from there. Yeah I considered using the chain stay and seat stay from another bike but I like my custom design.

 

[DAMIEN1307]

Thanks! Yeah I'd love to see what you did with the design. Did you tig the frame together? What do you think of flux core welding on chromoly?

That is a bummer. Does he still have a profile to look at? Maybe I could get some info from there. Yeah I considered using the chain stay and seat stay from another bike but I like my custom design.

Here is one link from the deleted former member that might help you formulate a few ideas.

New build. Project board track racer #2

Scored a free and really cool Dr Pepper beach cruiser. Frame is long and made from steel. So I Decided to do a second boardtracker build. 90% of my parts are going to be hand built just like my indian boardtracker. I will keep updating with pics on this one so yall can see whats happening. What...

motoredbikes.com

 

[cloakedvillain]

The reason board trackers looked like that was to accommodate the engines of the time. Continuing with that philosophy what do you think about a double cradle frame with an integral jackshaft mount where a bottom bracket would go on a bicycle?

Slide the engine fore and aft on it's mounts to tension the chain to the jackshaft, and slide the wheel fore and aft to tension the chain from the jackshaft to the wheel.

Sportsman already does this jackshaft set up but the intermediate sprockets ride on one-way bearings so the jackshaft can have pedals on it.

Big question to ask yourself is if you want to use motorcycle wheels, or bicycle wheels. I don't think anyone would recommend using bike wheels.

There is the option of a sportsman frame. https://sportsmanflyer.com/shop/parts/sportsman-flyer-drop-loop-frame/

 

[Gordy]

Thanks! Yeah I'd love to see what you did with the design. Did you tig the frame together? What do you think of flux core welding on chromoly?

That is a bummer. Does he still have a profile to look at? Maybe I could get some info from there. Yeah I considered using the chain stay and seat stay from another bike but I like my custom design.

Yeah, I tig welded it. It is on an old Columbia Sterling frame. That frame is currently in my trailer and it's all the way at the front. I'll dig a bit on my phone to see if I have any pictures.

 

[Gordy]

Here's a few pictures of the bike

Huasheng off kilter

Back with more craziness! Something told me to change the exhaust, so I whacked it off and started welding. Glad I did because the little Honda likes the shorter pipe and I like the way it looks. Someone did a study one time on the length of pipe that works best on these 50cc four strokes. I...

motoredbikes.com

 

[cloakedvillain]

Now that you're settling in are you gonna build up that columbia?