Every upgrade in Bike For Egg serves one of two goals. It either makes you faster, so you can reach the deeper biomes where better eggs sit, or it lets your base hold and hatch more pets, so you earn the cash for the next purchase. Bikes, trails and treadmill levels handle speed. Pen levels handle income. All of them cost in-game cash, and most also have a Robux price.
Quick answer: Buy bikes and trails in the Safe Zone shops for Speed multipliers, upgrade the treadmill for more speed per step ($120M for Level 5), and upgrade your pen ($500M for Level 4) for more pet capacity.
How upgrades fit the Bike For Egg loop
The game runs on a simple cycle. You ride out from the Safe Zone, steal an egg from a nest guarded by monsters, race it home, hatch it, and let the pet produce cash every second. That cash buys upgrades, which let you reach harder biomes and steal rarer eggs. Speed is the gate. If you try to steal from a nest you are not fast enough for, the game stops you with the message You don't have enough speed!
Four kinds of upgrade feed that cycle:
- Bikes from the Bike Shop, each with a Speed multiplier.
- Trails from the Trails Shop, also with a Speed multiplier.
- Treadmill levels, which raise how much speed you gain per step while training.
- Pen levels, which raise how many pets your base can hold.
Bike For Egg is free to play on Roblox. Robux prices appear alongside cash prices in every shop menu, so you can skip the grind on a single item if you choose, but every upgrade except the World Bike can be bought with cash alone.
Bike Shop prices and Speed multipliers
The Bike Shop sells seven bikes. Each one carries a single Speed multiplier, and you ride one bike at a time.
| Bike | Speed | Cash | Robux |
|---|---|---|---|
| Standard | x1 | — | — |
| Football Bike | x1.5 | — | — |
| Space Bike | x2 | — | — |
| Frost Bike | x3 | $1M | 19 R$ |
| World Bike | x4 | — | 35 R$ |
| Righteous Bike | x5 | $150M | 39 R$ |
| Korblox Bike | x7 | $1B | 79 R$ |
The Standard, Football and Space bikes are the early rides at the top of the shop list. Once you own a bike, its price buttons are replaced by an Equip button, and the one you are riding reads Equipped. The World Bike has no cash price at all, which makes the Righteous Bike the first cash bike above the Frost Bike. Moving from the Space Bike to the Righteous Bike takes you from x2 to x5, a large jump that is visible on the first ride out.
The Korblox Bike, at $1B, is the top of the shop’s cash ladder at x7.
Trails Shop prices and Speed multipliers
Trails are the glowing streaks that follow your bike, and each rarity tier adds half a step to the Speed multiplier. Like bikes, you equip one trail at a time.
| Trail (rarity) | Speed | Cash | Robux |
|---|---|---|---|
| Grey Trail (Common) | x1.5 | $100 | 1 R$ |
| Green Trail (Uncommon) | x2 | — | — |
| Blue Trail (Rare) | x2.5 | — | — |
| Purple Trail (Epic) | x3 | $1.5M | 19 R$ |
| Golden Trail (Legendary) | x3.5 | $30M | 29 R$ |
| Red Trail (Mythic) | x4 | $750M | 39 R$ |
| Galaxy Trail (Cosmic) | x4.5 | $20B | 49 R$ |
The Grey Trail costs $100, so it is effectively free from your first hatched pet onward. The Golden Trail is the cheap mid-game jump. At $30M it costs a fifth of the Righteous Bike, which makes it the natural purchase while you save for the bike. Beyond that, prices climb steeply. The Red Trail is $750M for only half a step more, and the Galaxy Trail asks $20B.
How to buy and equip a bike or trail
Both shops sit side by side in the Safe Zone, so you can upgrade both in one stop.
[E] Open shop appears, and pressing E opens the menu listing every item with its multiplier and price.
Equip once you own it.Equip on the new item in the same menu. Your previous bike or trail switches back to Equip, and the new one shows Equipped for bikes or Unequip for trails, which is how you confirm it is active.
Owned items stay in the menu with an Equip button, so you never pay twice to switch back to an older bike or trail.
Treadmill upgrades: costs and speed per step
The treadmill beside your base is where your base speed comes from. You ride onto it and every step adds speed points. Upgrading it changes its look and sharply raises the gain per step.
| Treadmill level | Theme | Gain shown | Upgrade cost |
|---|---|---|---|
| Level 4 | Rainbow / unicorn | +30/step, +255 pop-ups | — |
| Level 5 | Ice / snow | +80/step, +680 pop-ups | $120M or 39 R$ |
| Level 6 | — | — | $3B or 59 R$ |
The treadmill displays a per-step rate, while the number that pops up over your character is the speed you actually add on each tick. At Level 4 that pop-up reads +255. At Level 5 it reads +680, more than two and a half times as much for a $120M upgrade. Sustained training on a Level 5 treadmill pushes total speed past 1.3M.
Upgrade Level 4 > Level 5 with the cash and Robux price, and it updates to the next level once you buy.
Successfully upgraded your treadmill! confirms the purchase, and the treadmill changes from the rainbow design to an icy one.
Pen upgrades and pet income
Your pen is the fenced area at your base where eggs incubate and hatched pets earn cash. Upgrading it raises how many pets it can hold, which directly raises your income per second. The pen has its own upgrade sign, separate from the treadmill’s.
| Pen upgrade | Cost |
|---|---|
| Level 3 > Level 4 | $500M |
| Level 4 > Level 5 | $1B |
Buying at the sign shows Successfully upgraded your base!. The value of the extra room depends on what you put in it, and pet incomes span a huge range. A Rare Toucan makes $83/s, while a Mammoth makes $1M/s.
| Pet | Rarity | Income |
|---|---|---|
| Mammoth | Mythic | $1M/s |
| Spider | Mythic | $81K/s |
| Chillin Chilli | Mythic | $55K/s |
| Golden Orangutini Ananassini | Legendary | $13K/s |
| Crocodile | Epic | $874/s |
| Raccoon | Rare | $163/s |
| Toucan | Rare | $83/s |
Stolen eggs go into the Growing Eggs incubator, where each one runs a timer before it can hatch. Timers can run well over an hour on rarer eggs. The menu has a Grow All button, and an Equip Best button in the pet menu puts your highest earners to work.
When the timer finishes, walk up to the egg and press E at the [E] Hatch! prompt, or press OPEN in the Growing Eggs menu. The new pet starts earning as soon as it is placed.
Pets keep earning while you are offline, and the total waits in the pen for you to collect when you return. A pen full of Mythic pets can bank hundreds of millions overnight, enough to cover a treadmill or pen upgrade in one collection.
Using your upgrades on egg runs
Upgrades pay off out on the map. Biomes run in a straight line away from the Safe Zone, each one harder than the last, and the emoji next to each biome name gets more alarmed the deeper you go.
| Order | Biome | Eggs announced |
|---|---|---|
| 1 | Forest | — |
| 2 | Lake | — |
| 3 | Desert | — |
| 4 | Jungle | — |
| 5 | Snow | — |
| 6 | Volcano | Volcano egg |
| 7 | Abyss Ocean | Kraken egg, El Maja egg |
| 8 | Cosmic / Prehistoric | Cosmic Warden egg, TRex egg |
Every so often the server announces ALL EGG RESET! and posts which special eggs spawned where, such as Kraken egg spawned in Abyss Ocean!. Those alerts tell you which deep biome is worth the trip.
Shop, Index and Slow Mode buttons on the left, along with your hotbar along the bottom.
The map also cycles into night, with an on-screen countdown such as NIGHT ENDS IN 0:06 showing how long it lasts. Runs continue as normal through it.
You don't have enough speed! message is most likely to stop you here.
[E] Steal prompt. When it works, You stole an EGG! appears on screen and the egg count on your inventory button goes up.
RUN!! border means the guardian is chasing you, and a red Drop button appears while you carry the egg.
TRAPPED timer counts down from 7s, keeping you in the zone until it ends.
Which Bike For Egg upgrade to buy next
Prices tell you most of what you need to know about order. The Golden Trail at $30M and the Level 5 treadmill at $120M are the cheapest large speed gains in the mid-game, and the Righteous Bike at $150M follows close behind. Together they move you from struggling at the Volcano to running it comfortably and reaching the Abyss Ocean, where Kraken eggs spawn.
Once your speed is solid, the $500M pen upgrade becomes the better spend, because extra space for a single high-earning pet like a Mammoth returns its cost quickly. After that the ladder gets expensive on every front. The Red Trail ($750M), Korblox Bike and Level 4 to 5 pen upgrade (both $1B), Level 6 treadmill ($3B) and Galaxy Trail ($20B) are the long-term targets, and the rare eggs from Cosmic and Prehistoric are what fund them.
