The HardBoilder, designated the "MB1000RV", is Double's personal Honda CBR1000RR motorcycle. Like Double, the HardBoilder is black and green and is also able to change forms by swapping out the back half of the motorcycle after docking with the RevolGarry.
The first combination is the black and red HardTurbuler, which is a flying hovercraft-like vehicle. The HardTurbuler is often used by Double when he is in HeatMetal form. The HardTurbuler is armed with Scramble Cutter guns. It also can combine with Kamen Rider Accel, forming the AccelTurbuler.
The other combination is the black and gold HardSplasher, a personal water craft-like vehicle. This is often used by Double when he is in LunaTrigger form. The HardSplasher is armed with a torpedo launcher. [edit] Start Dash Mode The HardBoilder can also be put into Start Dash Mode to increase its speed. The Start Dash Mode components can be detached after deployment to slow down any chasing adversaries.
The HardGunner is the combination of the front unit of the HardBoilder and Kamen Rider Accel's Gunner A robotic tank. This combination is faster than the HardBoilder and also arms it with the Gaia Cannon.
The Rotation-Interchange Base RevolGarry is a truck/garage, an updated version of the SkullGarry used by Kamen Rider Skull. Besides holding the HardBoilder, the RevolGarry has a revolving wheel that has the components to change the HardBoilder to the HardTurbuler and HardSplasher.
The HardMammother is Kamen Rider Double's mammoth-like giant mecha, piloting it when the front unit of the HardTurbuler docks into it. The HardMammother also has an Maximum Drive attack that is activated when the Heat Memory is inserted into the Maximum Slot on the Double Driver. It only appears in Kamen Rider × Kamen Rider W & Decade: Movie War 2010 as the Mammoth Mecha under the control of Super Shocker, then Dummy Dopant control of it, before Double takes control of it. It is destroyed along with the Super Crisis Fortress.
The Diablossa is Ryu's personal Ducati 999 motorcycle. It also has a holder for the Engine Blade. Ryu does not ride it as Accel, likely because of his ability to exceed its speed when transformed. Its name comes from the Italian words "Diablo" and "Rosso" (meaning "Red Devil").
Accel Bike Form
The power of the Accel Memory allows Kamen Rider Accel to assume a motorcycle-like form called Bike Form. This form is accessed by removing the Accel Driver buckle from the belt when the Face Flasher lights up and when transformed, it allows Kamen Rider Accel to reach speeds of 920 km/h. In Kamen Rider W Forever: A to Z/The Gaia Memories of Fate, Bike Form has its own Maximum Drive after the Engine Memory is inserted in the Accel Driver and Accel switches to Bike Form: a super-powered dash through the target.
Gunner A
The Revol-Interchange Gunner A is a robotic tank that serves as Kamen Rider Accel's support droid. Its AI allows it to operate on its own from Accel. The technology is similar to Kamen Rider Double's HardBoilder and the front unit can also combine with the Gunner A to become the HardGunner.
Kamen Rider Accel Bike Form can combine with the Gunner A to become the AccelGunner. The Accel Memory links with the Gaia Cannon to release energy similar to a Maximum Drive called the Gunner Full Break. It is also armed with the Gattling Wheel, Bike Form's back wheel turned into a machine gun.
Kamen Rider Accel Bike Form can combine with the RevolGarry's Turbuler unit to become the AccelTurbuler. Not only does Accel have use of the Scramble Cutter guns, he can also transform his upper body back out of Bike Form to execute a Maximum Drive in which he pierces through his target in the shape of a burning letter A. Bike Form can also combine with Kamen Rider Double's Boilder or Splasher units to become the AccelBoilder or the AccelSplasher respectively.
The SkullBoilder is Kamen Rider Skull's personal motorcycle. It is a modified Honda CBR1000RR resembling Kamen Rider Double's HardBoilder, but all black in color. It is armed with a series of guns called the Universal Launchers.
The SkullGarry is a tank/garage that holds the SkullBoilder. It was created by Shroud and the vehicle later becomes Kamen Rider Double's RevolGarry. The SkullGarry only appears in the Kamen Rider Skull: Message for Double portion of Kamen Rider × Kamen Rider OOO & W Featuring Skull: Movie War Core.
Series:  Kamen Rider W