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8020 Chopper

8020 is an industrial prototyping extrusion made from aluminium. I used it here to construct a chopper by joining the extrusions with water-jet cut plates of 1/4inch aluminum.

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Step 1Choose and design the type of bike frame you wish for

Here are some of the options we designed at an MIT IAP class in 2003.

The CAD files are all included in this step.

3prongbototmbracket.dxf37 KB

4prongbottombracket.dxf40 KB

135deganglebracket.dxf10 KB

ari1to15Tbrace.dxf33 KB

ari3bracket.dxf32 KB

arisheadtubespacer.dxf31 KB

arisqbrace.dxf33 KB

bbhousing.dxf33 KB

cornerbracket.dxf32 KB

cwfix.dxf2 KB

cwhole.dxf2 KB

forkcrownworking.dxf3 KB

forkdropout.dxf63 KB

forkface.dxf36 KB

headtubebracketfinal.dxf37 KB

hwhole.dxf1 KB

hwfix.dxf2 KB

landsailfork.dxf22 KB

modropout.dxf38 KB

reardropout.dxf36 KB

recumtrike_1.dxf34 KB

recumtrike_2.dxf34 KB

recumtrike_3.dxf32 KB

recumtrike_4.dxf31 KB

recumtrike_5.dxf34 KB

recumtrike_6.dxf15 KB

seatbracket_1.dxf25 KB

seatbracket_2.dxf43 KB

seatclamp.dxf239 KB

telescopicbracket.dxf32 KB

trike_spindle_tube.dxf78 KB

trike3prongbottombracket.dxf37 KB

trikesteeringbracket.dxf46 KB

tsfix.dxf2 KB

tsholes.dxf4 KB

workingheadset.dxf56 KB

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15 comments

Aug 17, 2006. 9:20 AM

leevonk says:

those rectangular extrusion things can be bought from a company with some german name. They're a little expensive though. People use them alot in robotics.

Jun 29, 2011. 11:52 AMashmc84 says:

80/20 also makes them! contact: www.8020.net

Jun 22, 2009. 1:45 PMdmitri11 says:

what program did you use to make the drawings? i have never seen a .dxf file, autocad is .dwg

Jul 2, 2009. 6:52 AM

Marsh says:

Autocad will load DXF files. It's a very popular import/export format among many different software packages.

May 15, 2009. 10:54 AM$ NAB $ says:

Where do you need to open the links ?

Jun 24, 2008. 7:55 AMdirtydevil says:

hi,these don't seem to work on any cad file reader like CAD viewer,and i also tryed 2 more all give an error

May 15, 2007. 1:49 AMBob Jackson says:

Congratulations!!! That's awesome. Now can you build the Recumbent Bike out of 8020? I hope you can do it. I wish you the best luck on your next 8020 projects. Bob Jackson

Sep 28, 2006. 12:21 AMbuildingteen says:

I'm building a chopper for my homecoming parade and I need a fat wheel for the rear where can I get one?