There is a version of kids' gear where you buy the biggest thing that zips, roll the cuffs, and hope. Then there is the version where somebody measures the rider you actually have and builds for them. After a season of watching both approaches in the paddock, I am done pretending they are equivalent.
What sizing up adult gear gets wrong
Leathers are not clothing; they are armour with a fit tolerance. An adult small on a kid puts the shoulder cup somewhere near the collarbone, the elbow armour halfway down the forearm, and the back protector riding like a dropped backpack. In a slide, armour that migrates is decoration. The suit survives; the joints it was protecting take the wear. Growth room sounds practical until you realize the room moves the armour every single time.
What custom actually changes
A made-to-measure kids' suit — Gryphon's custom program is the one we know from the Canadian paddock — starts from the rider's measurements, not a size chart's average child. Three things follow from that. Armour placement: cups and slides sit where the joints are, because the panels were cut for this body. Growth allowances: built where growth actually happens — cuffs, waist, a seam the maker can let out — instead of everywhere at once. And fit in the riding position: measured crouched over the tank, not standing straight, because races happen folded over a bike at speed.
The third difference is the one nobody prices until the first crash: repairability. A custom suit is worth repairing, and a maker who built it can rebuild a shoulder panel after a crash season instead of you shopping for a whole new suit. We lived this with the Ohvale crash repairs — gear that can be fixed is gear you can afford to keep safe.
What to measure and what to ask
Before you call any maker, measure twice: standing height and weight obviously, but the ones that matter are inseam, chest over a back protector, arm length from center back to wrist, and thigh circumference over riding layers. Take them in the underwear-and-thin-base-layer state the maker specifies, not over a hoodie.
The questions worth asking a custom maker: how do they handle growth — let-out seams, replaceable panels, a trade-in program? Where does the armour come from — certified CE level at hips, shoulders, elbows, back? What is the repair turnaround mid-season? And what do they need from you at reorder time, because a good maker keeps your rider's pattern on file and the second suit is where custom gets cheaper than it looks.
The honest cost
I am not going to quote you prices — they move, and the range depends on options — but I will tell you the shape. Custom kids' leathers cost meaningfully more than off-the-rack juniors up front, and less over two seasons once growth adjustments and crash repairs enter the math. Get a quote for your rider's sizes, then run your own two-season comparison with the crash budget from our true-cost post. For us the argument settled it: the armour is only real if it is where the rider is.