After spending a lot of time trawling through this forum looking at the great custom kids bikes, I thought I should add my effort. Our eldest daughter (3.5yrs) is currently loving her Islabike Rothan balance bike, but I think it's time to unleash the pedal bike soon. I picked up a 12" Hotrock at a childrens equipment sale a few years ago(!) as it was a bargain at £17.
So while the Hotrock has a nice frame, most of the stuff hanging off it is pretty disappointing. The caliper brake is marginal at best, cranks don't run particularly true and have a huge amount of friction, and the rear wheel weighs a ton.
So my idea is to improve the braking, reduce the drivetrain resistance, and hopefully save a little weight in the process.
So here it is as it stands, and the weights after breaking it down. I'll add more info and pics as things progress.
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Thread: Project 12" Hotrock