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Ultra Race Across South America ( (なん) (べい) (おう) (だん) ウルトラレース Nanbeiōdan Urutorarēsu) is the one hundred seventy fifth chapter of the Dr. Stone manga.

Summary[]

The chapter starts with Kaseki and Chrome stretching a piece of rubber, only for it to snap back and smack Chrome, who is delighted. Kohaku is then shown expertly dribbling and juggling the rubber balls they made last chapter, to the awe of Chelsea and Luna. She brings up the fact that as it is, it's too floppy to be of any use for anything but a plaything. Senku explains that there's a next step to be done, to which Xeno adds that until the next step was discovered 200 years after Columbus brought it back to Europe, rubber was not used for any preactical purpose.

Senku then asks Taiju to help with the processing: roll the rubber into sulphur and carbon powder, turning it black, then heating and stretching it (vulcanisation). Finally, Senku stamps the tire pattern onto it.

Xeno then asks if they'll be making inner tubes separately, leading Kohaku to question why he's being so helpful. Xeno responds that he's doing it with his own well-being in mind, saying the "Junior Science Brigade" is free to do whatever they want as long as they're not taking Xeno down with them, then adding they should be fine with Senku at the helm.

Senku then continues with his scientific explanation, shaping the rubber into circles and tossing in wires and cloth. Heating then cooling gives it the tire shape, then Taiju helps him to put in the rubber inner tubes and wheel axles. Finally, they just need to inflate the inner tube then they have tires. Kohaku comments that they're much smoother and speedier than the old bamboo wheels. Chrome is shown being flung off the ship a second time by the rubber.

Senku and Ryusui then direct everyone to start making the vehicles as fast as possible, as they're on a tight schedule, to which Gen complains they're always on a tight schedule. Kaseki starts ripping apart the boat to work on the vehicles (his favourite modern craft).

We then go back to Stanley on the Perseus, chasing the decoy Mobile Lab. As soon as they have visual, Stanley states it's a decoy and destroys it using the battle station, sinking the poor mobile lab. Stanley then confirms there's no one on board before commanding them to back up and chase the other boat southward.

Chelsea announces they've reach Ecuador, which is now a dry desert. Hyoga comments that the journey should be easier but there won't be much cover. Him and Kaseki then starts ripping apart the boat they no longer need to repurpose it for motorbikes. Carlos and Gen are shocked when Ryusui says the motorcycles with run on wood, with Xeno correcting that it'll be the gas produced from burning wood.

Senku tells everyone he'll be making one 'boss' bike and five 'baby' bikes, where the 'boss' one has a boiler for burning wood and collecting charcoal gas, then the baby ones use the six engines from the boat fuelled with the collected gas.

Senku riding Gen

Senku riding behind Gen.

Ukyo informs everyone that the mobile lab has been sunk, and Stanley is coming for them. Ryusui tells everyone to strap in for several all-nighters of hard labour.

Some time later, the Perseus appears at the shore, Suika standing on the remnants of their smaller boat to alert them. Stanley and his team jump off using ropes, yelling to surround them. Ginro calls from inside the Perseus to run.

Lights flick on.

Something cracks and breaks.

A motorcycle, driven by Gen with Senku riding passenger breaks out of the wall.

The team rides off together, with Xeno gagged.

Chapter Notes[]

  • Vulcanised rubber, tires and motorcycles are acquired.
  • The mobile lab is destroyed.
  • The teams reach Ecuador.
  • The stolen boat is reused to make motorcycles.
  • The groups on the motorcycles are as follows:
    • Gen (driver), Chelsea, Senku
    • Ukyo (driver), Suika, Kohaku
    • Taiju (driver), Kaseki
    • On the largest motorcycle: Ryusui (driver), Xeno (gagged), Hyoga
    • The remaining people are: Chrome, Francois, Tsukasa, Carlos, Max, and Luna on the other two motorcycles.

Characters in Order of Appearance[]

Trivia[]

  • The motorcycles and desert chase designs were inspired by Mad Max and Akira.[1]
  • The mobile lab is shown with a tiny halo as it sinks on the map on page 9.
  • Stanley never confirms the state of the Panama Canal.
  • The Atacama desert has spilled over from Peru all the way to the coast, making it an arid region. Chelsea would have expected a humid, subtropical climate if it were still the 21st century.

References[]

Site Navigation[]

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Chapters not yet in tankōbon format Terraforming4D Science: 14D Science: 2
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Story Arcs
Prologue Saga
Stone Formula Arc
Chapters 1234
Episodes 12
Vs. Tsukasa Arc
Chapters 56789101112
Episodes 345
Ishigami Village Saga
Kingdom of Science Arc
Chapters 131415161718192021222324252627282930313233
Episodes 5678910111213
Village Games Arc
Chapters 34353637383940
Episodes 131415
Village Origins Arc
Chapters 4142434445
Episodes 1617
Stone Wars Saga
Vs. Hyoga Arc
Chapters 4647484950
Episodes 1819
Communications Arc
Chapters 5152535455565758596061626364656667686970717273747576777879808182
Episodes 20212223242526272829303132333435
Source of the Petrification Saga
Age of Exploration Arc
Chapters 8384858687888990919293949596979899 100
Episodes 35Ryusui3637383940
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
Episodes 4142434445464748495051525354
The Truth of the Petrification Saga
New America City Arc
Chapters 139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
Episodes 555657
South America Arc
Chapters 170171172173174175176177178179180181182183184185186187188189190191192193
Episodes
New Stone World Arc
Chapters 194195196197198199200
Episodes
Globetrotting Arc
Chapters 201202203204205206207208209210211212
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Stone to Space Saga
Moon Mission Arc
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