First, ask yourself what skill level you're at. Be Honest. It might be a lot less hassle to buy a trike from a shop or
another builder.
What tools do you have access to. You can build one with basic hand tools, but it's a hassle. Drill press, angle grinder, lathe, etc all make the process a lot easier. A welder is obviously a prerequisite, but you can get a shop, or a mate, to weld up your frame once you've fitted everything.
Next is frame design. Start with question number one. Running a hacksaw through a BMX and welding on an axle is fairly straight foward.

Custom building a monocoque trike from scratch isn't.
"T" style, "A" style? Single or multiple downtubes? Fully welded or bolt-on rear subframe? Adjustable seat?
"The Azzman" bent piece of exhaust tubing is a good place to start.
Weld steerer tube on at the appropriate rake angle(still trying to find that) 15 to 20 degrees from vertical seems to be a good compromise, ensuring tube and frame are on the same plane(straight line).
With a bolt-on subframe, I use 2 compression tubes welded into the rear section of the frame tube so tightening the bolts doesn't deform the frame.
A plate with bolt holes can also be welded to the rear of the frame.
With a welded on rear subframe, ensure axles are perpendicular(square) to the frame tube (fit forks and make sure they are vertical, measure from axle end on each side to the centre of steerer tube, same distance = square).
Axles are dictated by what sort of wheels you're going to use.
M12 x 180mm High Tensile bolts make good axles for GM wheels, use Nyloc nuts and plenty of grease.
You can use M16 bolts for Kart wheels (with suitable bearings)
or machined "live" housings for either, spreading the friction to another set of bearings.
Bolts can be welded head first into a piece of pipe to form your axle
or mounted into bearings.
Stub axles are a good option for wheels equipped with bearings. They also allow you to use an "A" style frame.
Wheels pretty much come down to budget. I've seen on here PVC screwed onto lawn-mower wheels to one-off machined bling.
From: http://www.d-trikes.com/forum/viewtopic.php?f=18&t=451&sid=...
Permalink Reply by NIGEL SAUER & MCS ROIL PLATINUM on March 25, 2011 at 12:44pm great drift bike
Permalink Reply by Aaron on March 25, 2011 at 1:32pm
Permalink Reply by JimmyDrama on March 25, 2011 at 2:41pm
Permalink Reply by JimmyDrama on March 25, 2011 at 3:07pm
Permalink Reply by Aaron on March 25, 2011 at 11:12pm right a quick update..
ive been out finding parts. seems old school chairs, you know the real uncomfortable plastic ones, yer them, they get damaged real easy so school just bin them! i got 4 today out of a massive pile!
and.. for wheels
http://www.screwfix.com/prods/69497/Ironmongery/Castors/Fixed-Casto...
i know its expensive, but im hoping theres some sort of bearing in there.. we tried skate wheels but they were far too grippy, scary, and not even scary fun, just scary!!! lol quite glad i didnt have a go!!! heh
Permalink Reply by Aaron on March 25, 2011 at 11:18pm Jimmy i bought a BMX frame for £20!!!
its a hoffman too.. so its gunna be strong ;)
search friday ads, freecycle, gumtree etc... remember all u really need is...
BMX front end.. wheel, forks, brake, stem, bars, brake lever.. keep the other as spare or for the next trike..
chop the frame up, weld some bracing in and some kind of axle, get a seat, bolt that in afte ryour wheels are on, dont want ya nuts draggin now do we!!.. point down a hill and send it!
Permalink Reply by Connell on June 16, 2011 at 1:22pm Im new to this, saw it on youtube and thought right im having it!! Bought a BMX frame for £5 with front brake and front wheel, going to get a 20mm steel shaft turn down the end to fit 6003 bearings (standard in nylon castors for pallet trucks) weld it to the rear of the frame and boom..... Some drift action goin down. I reckon all for less then £30!!
Im new to this, saw it on youtube and thought right im having it!! Bought a BMX frame for £5 with front brake and front wheel, going to get a 20mm steel shaft turn down the end to fit 6003 bearings (standard in nylon castors for pallet trucks) weld it to the rear of the frame and boom..... Some drift action goin down. I reckon all for less then £30!!
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