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P300 action.jpg

P300 in action. Speed is app. 30km/h. Photo: Teppo Mäkelä

Roll out 2.6.2012 at Joensuu Finland.

More pics here | Project blog here in Finnish | Project blog translated Finnish to English by Google

NEW: Construction plan in full 1:1 scale - in PDF format.

Construction of the front part

The boom tube is a 40x40-1.5mm thick welded to 30x15-1.5mm "loop" fork parts.

Front part.jpg

How to bend fork parts.

Final cut bend.jpg

All fork parts together in welding assembly plywood.

Bending assembly.jpg

Nose boom welding assembly.

Weld package front tube long.jpg

Front part - nose boom to fork pieces welding assembly.

Boom part.jpg

Last joint - front part - pivot/nose boom together in 20 degree bend. Dropouts comes over this joint.

Front dropout joint 20 degree.jpg

Construction of the rear part

The bottom tube is a 40x40-1.5mm thick welded to 30x15-1.5mm fork parts - in this pic, parts are tighten to plywood plate.

Rear fork welding jig.jpg



Pivot idea illustration (60 degree angle):

1. 12mm bolt 2. Washer (hits only bearings center) 3. Bearing - sealed (12mm inside hole - 32mm outer diameter - 10mm thick) 4. Tube 100mm - 32mm inside diameter 5. Tube 78mm - 32 mm outside diameter tube (hits only bearing outer part) 6. Tube 80mm - supports bolt - a bit longer than tube what makes bearing hole 7. Nylon lock nut

Rear part grab, before welding.

Rear tube pivot grab.jpg


Pivot Angle [°] Trail [cm] Seat Height [cm] BB-Seat Diff. [cm] Ground Clearance [cm] Wheelbase [cm] Weight [kg] BB-FWA [cm] BB-EOS [cm] Turning Circle [m] Front Tubing [mm] Wheel Size [inch] CG [%]
P300 59 -14 35 20 18 108 14 47 75 - 30x15x1.5 20" 20" -