Untitled Motorcycles reveal custom Zero SR/F

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London and Californian based custom motorcycle builders, Untitled Motorcycles, have created a one-off electric naked, based on the Zero SR/F.

Known as the Zero XP, the bike began life as the firm’s £17,990 (for the standard model) SR/F, which arrived in dealers in May 2019 and produces 110bhp and 140ftlb of torque from its ZF75-10 motor and ZF14.4 lithium-ion battery.

The bike was built by Untitled’s Hugo Eccles, who has previously worked on large-scale projects with the likes of Ford. He was given exclusive access to the pre-production machine during the final stages of its development, in order to create the drag bike-inspired XP. 

Debuted on Thursday, 4 July at the Goodwood Festival of Speed, just the seat and footpegs are retained in the same position, with a large portion of the switchgear and all of bodywork changed to create a futuristic naked streetfighter.

Offering a stripped-back take on Zero’s premium roadster, changes to the bike include custom clip-ons with an internally-housed electronic throttle, braided lines and Pirelli Diablo Superbike slicks. Minimalist bodywork is also used deliberately in order to show off the electric motor.

The bike makes use of many standard ancillary components though, including dual 320mm NG floating front discs with dual J.Juan 4-piston radial calipers.

“This isn’t about novelty for novelty’s sake, or some nostalgic idea of the future,” Eccles said in a statement. “The goal is to celebrate this unique riding experience through an entirely new function-led aesthetic. If the Zero XP looks futuristic, it’s because electric motorcycles like the SR/F are the future.

“From the outset I knew that I didn’t want to hide the powertrain behind a fairing. I wanted to unapologetically celebrate the character of this motorcycle.”

His comments were added to by Zero’s Brian Wismann, who said: “We appreciate how [Hugo] works with a select group of brands on a few carefully-chosen projects. We’d been looking for the right opportunity to work together for a while and felt the SR/F was the perfect fit. 

“Hugo is one of the most interesting designer-builders out there and it shows with the Zero XP. You can really see his industrial design perspective in every detail. He’s created something truly exceptional.”

You can see the full spec list in detail below.

Zero XP specs


  • CNC’d polymer panels with frosted polycarbonate edges
  • Custom seat, finished in suede
  • CNC’d aluminum seat shell, nose and bellypan
  • CNC’d aluminum fork brackets
  • Aerospace-spec ‘Ghost Grey’ experimental aircraft paint

Zero XP bodywork. Credit: Ludovic Robert

Frame & Suspension

  • Modified Zero SR/F frame
  • Showa SFF-BP 43mm self-balancing forks, fully-adjustable
  • Twin 320mm NG floating front discs with dual J.Juan 4-pot calipers
  • Showa GK01 monoshock with piggyback reservoir
  • 240mm rear disc with J.Juan single-pot floating caliper
  • Pirelli Diablo Superbike race tires (180/60 x 17 rear, 120/70 x 17 front)

Zero XP front brake caliper. Credit: Ludovic Robert


  • CNC’d top bracket with integrated speedo and dot matrix display
  • Custom clip-on bars, with internal electronic throttle
  • Motogadget Motoscope mini LED display, integrated into a one-off top bracket
  • Custom-moulded grips
  • Ruffy 5-way thumb joystick with custom-moulded rubber cover
  • ISR brake master with integrated switches, internally wired
  • Goodridge Sniper 2 braided stainless steel brake lines
  • CNC’d aluminium footrest brackets with ABS heel guards

Zero XP controls. Credit: Ludovic Robert


  • Zero Cypher III display within the tank
  • Modified Zero firmware
  • Customised and relocated battery charger
  • Keyless ignition
  • Anodised aluminium RFID key fob
  • Custom LED tail light array with integrated indicators
  • Custom LED panel edges
  • 4XLED twin headlights, mounted on winglets

Zero XP rear LED light. Credit: Ludovic Robert.

Live from the Zero SR/F launch in Amsterdam

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Zero XP custom side view. Credit: Ludovic Robert.