Unboxed: Bolt Motor Co.’s BMW R 100 — a crate-bound airhead reborn as BOLT ≠ 100

# Overview

# Origin and concept

Bolt treated the R 100 as a platform to upgrade both reliability and performance while delivering a minimal, raw aesthetic. The approach combined mechanical overhauls, structural rework, and bespoke metalwork rather than cosmetic repainting.

# Engine and drivetrain upgrades Bolt completed a full engine rebuild. New cylinders, pistons, and connecting rods were installed and the cylinder heads were fully reworked. The powerplant received an upgraded carburetor kit and an electronic ignition system to improve starting and running.

To modernize operation, the workshop converted the original cable-operated clutch to a hydraulic system to improve lever feel and engagement. Other subtle touches include custom-engraved BMW roundels on the carburetor enricher knobs.

# Chassis, suspension, and braking Bolt engineered a custom box-section swingarm to replace the original, with the Bolt logo incorporated into the fabrication. That swingarm is designed to increase torsional rigidity and is paired with upgraded YSS shocks for improved ride quality.

Up front the team adapted a modern inverted BMW fork to the vintage frame using CNC-machined triple clamps. Stopping power was upgraded to dual four-piston calipers and custom rotors.

# Modularity and practical design

Low-slung clip-on handlebars clamp to the inverted forks and Tarozzi rearsets set an aggressive riding position. A Motogadget electrical network including an M-unit manages the cockpit, bar-end indicators, pushbuttons, and Highsider mirrors.

# Visual and finish choices The build's focal point is a brushed, unpainted fuel tank. Bolt extended that raw-metal treatment to the minimal front fender, custom triple trees, brake calipers, rotors, and muffler. These bare-metal surfaces contrast with heavily textured black finishes on the frame and engine cases for a high-contrast, modern-meets-vintage look.

A 3D-printed headlight mask houses modern LED optics to sharpen the front profile while keeping components visually integrated.

# Team perspective and outcome Bolt's Head of Design & Bespoke Projects, Dave Rojas, described the project as a balance between classic BMW engineering, modern technology, and handcrafted design. The workshop reassembled a scattered set of parts into a mechanically upgraded, modular motorcycle with a sharply defined raw-metal aesthetic.

The finished BOLT ≠ 100 keeps the BMW boxer foundation but applies targeted engineering and handcrafted fabrication to change how the bike looks, rides, and functions.

# Technical snapshot

• Base: BMW R 100 air-cooled boxer twin (980 cc, five-speed, shaft drive in original spec)

• Clutch: Cable to hydraulic conversion

• Front end: Inverted BMW fork adapted with CNC triple clamps
• Brakes: Dual four-piston calipers
• Electronics: Motogadget M-unit, bar-end indicators, pushbuttons
• Styling: Brushed metal tank and components, textured black frame/engine, suede modular seats with integrated LEDs