Steal An Egg On KuKirin Sizes Explained
Sizes in Steal An Egg On KuKirin are a discovery tied to pets hatched from eggs. See how the game shows size differences and which displayed numbers it never labels.
In Steal An Egg On KuKirin, "size" is not about the Kukirin bikes at all. The game's own description lists size (サイズ) as one of the discoveries you make by hatching the eggs you collect, named right beside pets and mutations. So the advertised sizes belong to pets hatched from collected eggs, and you recognize them two ways: by sight — exceptionally "huge" pets and visibly big eggs — and by the numbers the game displays, namely percentage figures on hatch results and kilogram weights on eggs. What the game does not do, in everything shown so far, is put a "size" label on any of those numbers or demonstrate what a size difference changes.
Size belongs to hatched pets, not Kukirins
The game's description lays out its loop with a dedicated "hatch pets" step: you collect eggs, hatch them to collect rare pets, and the fun of that loop is discovering "pets, size (サイズ), mutations and more." That pins the advertised sizes on hatched pets. Two things it is often confused with:
- The rideable Kukirin vehicles. These progress as model tiers — players identify them as G2, G4 and so on — and you buy better ones in the shop for cash. Those are models, not sizes. The motorcycles list covers that progression separately.
- Mutations. The description names mutations as their own discovery category, distinct from size. A big pet is not automatically a mutated pet, and vice versa — see how to get mutations for that system.
How to spot a size difference in game
Two routes, both from normal play:
- On sight. An unusually large pet stands out against normal ones — one player greeted another with "what huge pets you have" and got the reply "Yeah, they're huge." Eggs work the same way in the world: "there's a big egg here that's rare" shows that big eggs are visible from a distance and that size can combine with rarity. Neither remark comes with an on-screen tier label; recognition here is purely visual.
- By the displayed numbers. Eggs show a weight in kilograms before hatching, and hatch results show a percentage. Both values vary per specimen, and players read them to compare quality.
The values the game actually displays:
| Where the game shows it | Displayed value | Player reaction in the same moment |
|---|---|---|
| Purchased "epic eternal egg" | 39 kg | "39 kg might be good" (speculation) |
| Stolen "bull egg ready to be collected" | 50 kilos | "Maybe it'll be good. 50 kilos it weighs" (speculation) |
| Hatch result — Velicoraptor | 24% | "that's a bummer too" |
| Hatch result target | 1% | buys another egg specifically to "drop the 1%" one |
Note on names: pet and item names above follow the video's captions, so spellings like "Velicoraptor" may differ slightly in game.
What size changes: nothing shown yet
This is where the honest answer has to stop short:
- No displayed value is labeled as size. The description names size as a discovery, but none of the numbers shown on screen — the hatch percentages or the egg weights — is marked as the size stat.
- No size effect is demonstrated. Every quality judgment attached to a number is player speculation ("39 kg might be good," "Maybe it'll be good," "that's a bummer"). The earnings figures players quote for pets — 11,000 versus 315 per second, and an earlier hatch at "60 per second. That sucks." — are never connected to any weight or percentage by any speaker.
So resist the natural assumption that a heavier egg or a bigger pet earns more: nothing shown ties the two together, and nobody in the gameplay claims it does. Likewise unknown so far is how large the size range is, how a size rolls on hatch, whether "huge" is a distinct labeled tier or just a scaled-up model, whether an egg's kilogram weight carries over to the hatched pet, and whether size can be rerolled, upgraded or traded. That absence reflects what has been shown of the game, not proof the game lacks a size label or effect — it's the first thing to recheck after any collectible-system update.
How to use this at the egg
When a hatch completes, read the full result: the pet plus its percentage. When comparing eggs — bought from the shop signs, stolen from animals or other players, or spotted big and rare in the world — read the kilogram weight and the overall look. Treat those numbers as per-specimen identifiers you can stack up against your friends' catches, and treat any "that one's good" verdict, including your own, as unconfirmed until the game itself labels a size or shows what one does.
For the loop around it, the egg hatching guide covers the hatch step, the egg stealing guide covers getting eggs in the first place, and the pets list and pet earnings pages cover the per-second numbers that size might one day connect to.