Actually went with the YL-12 for a pretty straightforward reason — it covers the 3-10 age bracket across three wheel sizes, 16 through 22 inches, and the high-carbon steel frame and fork are what you'd expect for something that'll take a beating form kids learning to balance.
What it does is give you a unisex bike with a rear V brake, which is plenty for this age group, and the aluminun alloy rims keep the weight down without sacrificing strength. Most buyers we deal with go for the 20-inch as the middle ground, but teh 22-inch works better if you've got taller kids.
The hard frame with fork suspension is fine for pavement or packed dirt but don't count on it for serious off-road — that's not what this is built for, and non-rear damper design keeps the cost sensible.
It's CE and CCC certified, so compliance is covered, and we're looking at roughly 5000 units a month production capacty with OEM or ODM options if you need custom colors (pink, green, white are the stock ones).
Carton packaging is standerd, and we usually have stock within 20 days or so, but confirm lead time if you're ordering over a few hundred — the 5000/month cap is split across other models too.
Not a bad fit for rental fleets or retail, and the 16-inch is actually easier to handle for the youngest riders than some of the heavier steel options out there.