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.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Project 12" Hotrock