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Picture of Converted 3-wheeled adult trike to bike trailer for cheap!
I wanted to re-purpose my dad's old 3-wheeled Schwinn Meridian. My mom bought it for him and he wound up running into it with the car. The main reason she bought it for him in the first place. My woman and I have a couple of dogs and I wanted to find a way to bring them to the local park and ride the wonderful bike trails at the same time. Sure I could have bought a normal bicycle trailer, but then I wouldn't be sharing this Instructable! 

Parts list and links at the end. 

Step 1:

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My dad, who had suffered a few strokes decided to drive the car into the bike, ruining two of the tires. Schwinn Meridians don't have normal bicycle tires. The hubs are bigger to allow a thick axle to go through, as one side turns with the axle when you pedal. I debated on how I could get the one rear tire repaired. More on the tires later. 

 
BigAndRed10 months ago

Having 2 casters is redundant.

Use 1 caster and a couple of U-bolts to attach to seat stem.

No need to drill holes in the seat stem then.

A block of wood cut into a wedge to compensate for the angle of the stem will help turning as well.

try alibaba.com 4 the parts u might need. though it can take up to 14 day to get them
crkrjak2001 (author)  astral_mage1 year ago
Thanks!
try looking on alibab.com 4 the parts u may need beware it can take up to 15 days to get them in tho
heres an idea use a bike seat alignment clap as your bolt in clamp. that way u can keep the strength of your seat pole intact.
crkrjak2001 (author)  astral_mage1 year ago
I wanted it to be a quick-release setup. Would the seat come off every time I unhooked the trailer? I don't think I did too much to damage the strength of the seat pole, as it is a thick piece of steel I drilled though, and a small hole at that. Something to consider if the hole starts to rust out and I need to replace the pole. :-) Thanks for stopping by and your comment.
some times u can just go to the good will place an buy a cheap bike or yr dump may or may not depending the policys allow u to take a wheels
crkrjak2001 (author)  astral_mage1 year ago
The inside diameter of the hub on the tires are different than a standard bicycle, as the shaft that turns inside the hub is bigger than a normal axle. The bearings are also non-standard. I didn't think to look around a dump for a 3-wheeled adult bike. Thanks for the comments. :-)
spyder20212 years ago
good job. make great use to an old bike. don't know if possible but would try to make the cart closer to the riding bike back wheel.
crkrjak2001 (author)  spyder20212 years ago
I wanted to make this without any welding or special tools needed, as not everyone has a welder (okay, I do have one). To lower the center of gravity I could chop the frame down and weld it back together, but welding aluminum isn't for everyone.

Thanks for your comment spyder2021. I could shorten the handlebar aka connecting rod to get it closer, but to what advantage? My turning radius would be shortened.