Kamijou Touma and Misaka Mikoto are riding Acrobike.

The Acrobike (アクロバイク Akurobaiku?) is an electronically assisted bicycle developed in Academy City.[1]


The acrobike is a electrically assisted bike, based on a mountain bike, with a top speed of over 50kph.[2] It has electronically-controlled suspension which softens impacts and allows the bike to jump over two meters. The disc-shaped gyros sandwiching the front and back wheels provide the acrobike with autonomous stability, keeping it from falling over even if its inclination exceeds seventy degrees.[1]

Cycle ArtsEdit

The acrobike is capable of a set of unique high performance acrobatics, known as Cycle Arts (サイクルアーツ Saikuruātsu?).[1][3][4][5][6] Its specs allow even an amateur to carry out these techniques successfully.[7]

Name Difficulty Notes
Tightrope (タイトロープ Taitorōpu?) 2 Using the acrobike for tightrope walking, including everything from literally crossing a rope to using guardrails, railings, or other narrow surfaces. It looks tricky but is not actually very difficult since it almost entirely relies on the gyros. Using slanted surfaces like the railings of stairs or escalators goes by another name[3] (Slope Clear).[4]
Sliding (スライディング Suraidingu?) 2 A cycle art using the gyro functionality. First, the user pedals like normal to build up speed. They then turn the handlebars perpendicular to their direction of movement, tilt themselves in the opposite direction of movement, and continue forward with the acrobike tilted at over fifty degrees. The trick is to go all out in turning the handlebars. The user has to be careful because tilting the acrobike too far will scrape their leg against the ground.[3]
R Dash (Rダッシュ R Dasshu?) 1 Probably the easiest cycle art. The user keeps the front wheel locked and pedals with all their might. After accumulating energy between the back wheel and the ground, they unlock the front wheel and make an intense start dash. Instead of being used on its own, this cycle art is meant to be the initial action in preparation for other cycle arts. It can build up speed without needing a lengthy approach, so it can lead to some surprisingly high-level tricks.[3]
Jumper (ジャンパー Janpā?) 2 A basic of the cycle arts. While moving, the user presses down with their weight to lower the suspension and then uses the recoil to jump. Their original acceleration changes how much forward momentum the jump has. It is apparently a must have for any performance using obstacles in the street.[4]
Flail Turn (フレイルターン Fureirutān?) 3 The user builds up some speed, locks the front wheel to lift up the back wheel, and twists the handlebars to swing the back wheel around like a bat.[4]
Slope Clear (スロープクリア Surōpukuria?) 2 A variation on the Tightrope. For this one, the user slides down the sloped railing of an escalator, stairs, or the like. The trick is to lock both wheels to purposefully slip down. Letting the wheels turn provides too much speed and raises the risk of crashing.[4]
Flying D (フライングD Furaingu D?) 5 A variation on the Flail Turn. While swinging the bike around, the user unlocks the front wheel, turns the entire bike on its side, and jumps into the air. Ideally they rotate the bike at least once while horizontal. If they do not reorient the bike before landing, they will fall over.[4]
Takeoff (テイクオフ Teikuofu?) 2 A variation on the R Dash. Instead of unlocking the front wheel, the user lifts the entire bike in a wheelie to launch themselves into the air instead of straight forward. As with the R Dash, it is most important as a lead-in to higher level tricks.[4]
Motor Drive (モータードライブ Mōtādoraibu?) 1 The user grabs onto a car, motorcycle, or anything else with an engine to build speed from an external source. The method itself is simple, but due to the danger of an accident that could involve an unrelated individual, it has to be used with extreme caution.[4]
Rapid S (ラピッドS Rapiddo S?) 5 The user runs horizontally across the edge a cliff with a slope of seventy to eighty degrees and slides down the cliff with both wheels pressed against the wall. It is possible thanks to the gyros, but if one of the wheels leaves the wall even slightly, they will lose the benefit of the gyros and immediately begin to fall.[5]
Lunatic G (ルナティックG Runatikku G?) 4 Building up speed on the ground, the user presses the acrobike's wheels against a wall alongside them and races across the wall for several seconds. As it uses centrifugal force, terrain like an arch-shaped tunnel is necessary for the transfer.[5]
Swing J (スイングJ Suingu J?) 2 A flight of over 10m after jumping from a slope. Doesn't require much skill as it relies on terrain and the acrobike's specs.[5]
Universe (ユニバース Yunibāsu?) 5 Continuing on from Lunatic G, up the wall to the ceiling.[5]
Over Kp (オーバーKp Ōbā Kp?) 4 Jump and flight like Swing J but exceeding 30m.[5]
Moonsault (ムーンサルト Mūnsaruto?) 5 Full backflip added after Swing J and Over Kp.[5]
Hug (ハグ Hagu?) 2 Instead of sitting in the saddle, the performer clings to it from the side. That alone is simple, but there are a number of ways to hold on such as making a handstand on top of the handlebars. For that reason, the difficulty was increased by one point.[6]
Stairs Shift (ステアシフト Suteashifuto?) 1 Smoothly climbing stairs with the acrobike. At first glance, it looks like simply riding up the stairs while leaving everything to the suspension, but doing that will blow a tire. The performer must raise and lower his or her weight a little to help absorb the impacts.[6]


Shinyaku Toaru Majutsu no IndexEdit

Magic God Invasion ArcEdit

Main article: Magic God Invasion Arc

Due to getting carried away around the time of preparations for the Anti-Crime Orientation, Tsukuyomi Komoe purchased an acrobike for her school.[8] It was used by Kamijou Touma to escape from the High Priest, together with Misaka Mikoto.[1]


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