Homemade, CNC'd balance bike – much progress!
I started a thread ages ago about making a balance bike for my little girl. Things didn’t really get going but now I’ve had a chance to make a start and it’s going along nicely I reckon 🙂Posted 4 years ago
I wanted to make as much of the bike as possible but will need to buy a few bits.
A few pics of progress:
Downtube (2″ aluminium tube)
Swingarm (CNC machined out of solid billet)
Stem (CNC machined from solid billet. 28mm offset)
Bars and stem
Just need to turn the headtube, seat tube and swingarm fixing.
Hopefully get it done in time for Christmas…
Mild steel might be a bit of a lump. Harvesting some tubes from an old frame might be better. Saying that, for a single tube frame, some 1.5″ ERW tube would be about right size, cheap, easy to get and won’t be too heavy.
Nicer stuff would be Columbus cro-moly in 0.8mm wall from Ceeway for about £12 plus VAT for a 1.5m length. I made this bigger bike (for 7 to 12 yr old) with 1″ top / down tubes. Seat tube will generally be 28.6 (1 1/8″) for a 27.2 seatpost.
Posted 4 years ago
Bit more progress today. Got the headtube machined and made some simple gussets:Posted 4 years ago
@lurchh: I’m using an FSA headset for a Giant OCR. It’s a funny size so CRC were selling them off cheap. I’ve just made the headtube the correct size for these cups. The main tubes on this frame are 2″ diameter with a 2.5mm wall.
Stunning work OP!! Love home built bike threads and this is right up my street.
Im currently planning a carbon balance bike for my little one, he is only 7 month so i have a good time scale to get it done 🙂
Keep up the good work and i look forward to updatesPosted 4 years agoeddSubscriber
@ stevied – I saw that you were after some old fork stanchions the other day on classifieds. I have some Fox 36 stanchions that you can have for the price of postage. Obviously they’re worn out for suspension use but I imagine would be fine for a project like this. 195mm, 1 1/8” steerer, can’t send them until Monday though. E-mail if you’re interested.
Good work with the project by the way.Posted 4 years ago
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