The goal of this project is to recycle bicycles and supply a comfortable mode of trans portion. The material cost varies depending on the newest of the bicycles you chose to use. You will need at less three bicycles to complete this project and six 1 inch square framing (1”X6'). All materials are available at your local Home Depot, Lowe's and /or neighborhood hardware store.
The Goal:

The Frog
The three bicycles will have to be disassembled down to the steering tube fork.

Steering tube attached to frame and fork.
The 1” square tubing can be substituted with any material size you wish but all modification will affect the original design.
Frame 1” square tube:

The secondary frame for strength is ¼” square tube. The angle supports are ¼” rod. Everything else is the 1” square tubing. I used one of the steering tubes as the main steering column and cut the second one in half for the steering hubs on the front wheels.
When choosing the three bicycles keep in mind, two of them have to be the same size. When choosing the third bicycle you may wait to choose the next size down for future changes on the bicycle car.
24” wheels in the back and 20” wheels in the front:

The basket is for carrying things.

24” wheels in front.

Change your dim. Sheet

The Frame and layout of the Frog.

The rear section and body rails Mig (no gas) welded 120vac. The rear tire forks were used by sliding them into the square tubing and welded to the tubing. The forks can be built as part of the frame. Measure the length need to hold the wheel in the proper distance from the seat frame. Then cut the forks to length and do a long 45 degrees cut. The axle hole or slot is then drilled and the wheel is mount directly to the fork frame.


Left side is inside fork.
The mounting of the bicycle forks gives a stronger support for the rear drive wheel. The forks are not very visible after you modify and paint them which can be seen in the below picture.

The frame measurements are for a 24” wheel diameter setup. The frame configuration can be changed to any wheel size with the information in measurement chart included with these plans. You can purchase the square tubing at Home depot or Lowe's but HD was cheaper.
The bicycles can be purchased at Wal-Mart for about $60.00, each which gives you a new parts start-up. The two 24” bicycles I did purchase from Wal-Mart and the 20” inch bicycle I purchased used at an $8.00 cost. The cost of the square tubing for the completed bicycle car is around $120.00. The bicycle cars that are sold online go for $1800-$4000.