Plywood Wedge Bike
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Plywood sandwich bike frame for easily testing geometry and ergonomics

Head Tude and Stem can be adjusted independently for Head angle and tiller

Looking down through frame between Seat Post /Crank unit and Head Tube unit

Looking down through frame behind seat post unit

Plywood Wedge Bike

Frame Materials:   5 foot by 1 foot 3/4" plywood shelf cut in half.   steel box tubing welded to head tube, another steel box tube welded to a BB shell and to a seat tube.    It also has an adjustable stem made from a discarded exerciser.

Weight as pictured: 35 lbs

What was I thinking?:

Its a semi compact bike with adjustable pedaling geometry, adjustable steering geometry and adjustable seating geometry.   The purpose is to experiment with steering, seating, and pedaling geometry.   The other purpose was to demonstrate a non welded wood bike idea.

How Does it ride?:

In the configuration shown its fun for kids and adults.   It has a far back CG that makes it fun to slalom.   It is shown in a shallow seat tube angle configuration that lets riders easily put their feet on the ground.   The adjustable stem lets the rider change the amount of tiller while on the fly.

What Changed before the photos?:

I first built it with the plates in a slightly different spot but pivoted them down to touch the BB shell and bolted them in place.  

What may change later on this bike?:

I will be repositioning seat-BB beam to try steeper and shallower angles. I want to test a 16" front wheel with a different fork.   I'm trying to design an adjustable rake for easy fork rake testing.

What would I do differently on another attempt?:

The plywood interferes with the top of the chainwheel.   That drove me to use the small kid chainwheel and cranks shown.   Next time I will use plywood cut higher to accommodate adult chainwheels and cranks.   I will also try to design parallel plates so I will not need to use wedges to shim the seat beam and head beam.  

What lessons were learned?:

It worked well as a platform for testing head angle.   It was an easy conversion.   It is easy to transport.  

What are the keeper developments?:

Plates and bolts for adjustable geometry.

It is cool to see the head tube, seat-BB beam and rear wheel as 3 free-floating components held in position by a plywood sandwich.

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