Bygg din egen träcykel

Erik Björk om hur du bygger din träcykel (OBS engelska instruktioner)

This document is to be seen as a source of inspiration only. The author of this document takes no responsibility for any injuries that might be a result of making constructions based on this document.

How I contsructed my bike part by part.

Frame
Regular Pine 2" x2" (45x45mm). Attached together with 12mm construction
Plywood made for concrete molding. I choose it because of the durable
surface. I glued it with polyurethan glue and screwed everything with
3,5x50mm screws. The size of the frame is roughly the same as a
Cannondale Bad Boy Ultra size medium, quite compact in other words.

Fork
Same as above

Wheels
Standard 26" wheels commonly used on mountainbikes with quick release
fittings. 135mm hub back converted to singlespeed and 110mm hub in
front (I belive it´s 110mm anyway)

Bottom bracket
I had a parts bike and cut out the bottom bracket together with it´s
housing and about 40mm of the lower tube and the seat tube. Then I
drilled matching holes in the ends of the wood. The plywood on each side
helps securing it. Other solutions are probably possible.

Headset
I took a pin bolt and put machine bearings in top and bottom of the
frame. Then I used nuts and washers to hold the pin bolt and the fork in
place. A traditional 1" bike headset might be another solution but I
didn´t have it and no time getting it.

Seatpost
I choose a 25,4mm traditional bike seatpost. I wanted it as thin as
possible to leave as much clearance in the wood as possible. Look for
adjustable drills in the hardware store to get the right fit. Instead of
a seatclamp I drilled a small hole in the wood and a matching one in the
seatpost, just make sure you get right height first.

Stem
In the picture there is a wooden stem, however it didn´t resist the
bending force from the bars. It´s now replace with a normal 1 1/8" stem
pressed down using the pinbolt, nut and a thick washer. I took a top cap
and drilled out the hole to the size of the pinbolt to keep it centered.

And yes brakes
In the pictures the bike actually has no breaks. I had to get ready for
a exhibition and didn´t have time for it. Now it has a rear rim brake
taken from an old roadbike. I took a 2mm iron with holes sold in
hardware stores for joining different woodpieces. Cut it in two pieces,
drilled out the center hole to match the bolt for the brake, attached
the brake, drilled a hole in the plywood for clearance and attached the
iron/brake combination to the plywood.