Californian bravado, German cool: Untitled’s BMW R100

A custom BMW R100 by Untitled Motorcycles—a mix of Californian bravado and German cool.
Unless you’re immersed in every corner of the custom world, you probably associate Untitled Motorcycles with one bike: the amazing Hyper Scrambler Ducati, built in San Francisco. Our article triggered a media frenzy that culminated in an appearance on Jay Leno’s Garage.

But the mark of a good shop is the ability to turn a worn-out older bike into a thing of beauty. And that’s what designer Hugo Eccles has done with ‘Kalifornia,’ Untitled’s latest build. Based on a 1983 BMW R100, it’s a fabulous mix of Californian bravado and German cool.

A custom BMW R100 by Untitled Motorcycles—a mix of Californian bravado and German cool.
The engine, stripped and vapor-blasted to its natural aluminum, now breathes through a pair of Dell’Orto PHM-38 carbs—as used on the R90S—with custom stainless steel manifolds and one-of-a-kind aluminum airbox tubes. The stock plastic airbox cover and starter cover have both been replaced with the earlier metal versions.

The BMW nameplate, normally black, is painted in the same cream as the fuel tank. UMC have kept the stock headers, insulated them with grey exhaust wrap, and slotted on custom stainless steel silencers by Cone Engineering.

A custom BMW R100 by Untitled Motorcycles—a mix of Californian bravado and German cool.
The ‘mismatched’ front and rear wheels are intentional, a style borrowed from the cycling world. “I’ve always liked the tension of having a cast wheel paired with a spoked wheel,” says Eccles.

In fact, neither of the wheels is original. The factory cast snowflake wheels were ditched early in the project and the original 19″ front wheel replaced with a 18″ rear rim, laced with stainless steel spokes to a modified BMW 2-rib hub.

Both front and rear run the same 4.1×18 Michelin Sirac tires, imported from UMC London specifically for the project. (“It’s really useful having workshops both in the USA and UK for sourcing difficult–to-find parts.”)

A custom BMW R100 by Untitled Motorcycles—a mix of Californian bravado and German cool.
The BMW’s gauges and controls have been completely overhauled and replaced with a custom headlight, housing an analogue Motogadget speedometer and modified Posh switchgear.

Hidden internal wiring is routed through the low-rise Renthal handlebars. A modern Nissin master cylinder controls the twin Brembo calipers and EBC deep-dish rotors on the spoked front wheel.

A custom BMW R100 by Untitled Motorcycles—a mix of Californian bravado and German cool.
A stainless steel battery box, a UMC item available for purchase, relocates the gel battery under the gearbox. “It’s a simple system that doesn’t require any cutting or welding, and uses the existing engine bolts.”

The BMW’s battery is linked to an upgraded EnDuraLast charging system for modern reliability. The bike was completely rewired from head to toe with an m-Unit and m-Lock keyless ignition system from Motogadget, activated by a tiny RFID capsule sewn into the owner’s glove.

A custom BMW R100 by Untitled Motorcycles—a mix of Californian bravado and German cool.
The most distinctive element is the paint and finish, though. “I wanted to retain a connection to the original motorcycle, using BMW Motorsport stripes but with a twist.” So the classic ‘M’ colors have been reinterpreted in a deep metallic flake. “It’s BMW meets Evel Knievel,” jokes Eccles.

The metallic blue and red stripes run parallel with the forks, and visually separate the front and the rear of the bike. Ahead of the stripes, the motorcycle is raw metal, stripped, brushed, and clear-coated to preserve the finish. Behind the stripes, the original fuel tank has been painted in a luscious solid cream.

A custom BMW R100 by Untitled Motorcycles—a mix of Californian bravado and German cool.
“Early in the design process, my client produced a photograph of a beautiful Porsche 356 in ‘Ivory’ with a tan interior,” Eccles says. “That image became a key inspiration for the Kalifornia’s color scheme.”

Sourcing the Porsche color proved an unexpected challenge: over the years Porsche has created different versions of ‘Ivory’ that vary from a warm white to a pale grey. “I eventually found a Porsche in the correct original color, and matched the paint by hand,” explains Eccles.

A custom BMW R100 by Untitled Motorcycles—a mix of Californian bravado and German cool.
The cream color scheme is complemented by a cross-stitched tan leather seat, which matches the Tommaselli natural rubber grips up front. The entire rear subframe and seat are bolt-on items from UMC. (Untitled has developed several parts for airhead BMWs that can be purchased and installed over a weekend.)

Tiny, almost-invisible, Motogadget m-Blaze turn signals are integrated onto the frame, and a low-profile LED taillight has been ‘frenched’ into the rear mudguard.

A custom BMW R100 by Untitled Motorcycles—a mix of Californian bravado and German cool.
“Airheads have become somewhat ubiquitous so it’s increasingly difficult to do something interesting,” says Eccles. “But I think this build strikes a balance. It’s a daily rider so it can’t have crazily low clip-ons, a cardboard-thin seat, or impractical zero rake.”

“It’s about subtle details that work together, rather than a single one-liner statement.”

Untitled Motorcycles | Facebook | Instagram | Images by Sean ‘Speedy’ Donahue

A custom BMW R100 by Untitled Motorcycles—a mix of Californian bravado and German cool.

BUILD SHEET

Frame, Suspension, Wheels
Original main frame, de-tabbed, powdercoated.
Original swingarm, de-tabbed, powdercoated.
Reconditioned Koni shocks, powdercoated springs.
Custom UMC-designed subframe, powdercoated.
Custom cross-stitched tan leather seat by Acker Leather Works.
Original 19″ front wheel replaced with 18″ rear rim, stainless steel spokes.
R65LS 18″ cast ‘Y’ style rear wheel.
Michelin Sirac 4.1 x 18″ tires.
EBC ‘deep dish’ brake rotors.
Original forks, stripped, custom white reflectors, rubber gaiters.
Upgraded fork internals, custom nylon spacers.
Modified BMW ‘2-rib’ front hub.
Original Brembo calipers, stripped, vapor-blasted, rebuilt, reconditioned.
Original foot peg mounts, modified to fit /5 rubber rests.
R65LS rear drive hub, stripped, vapor-blasted.
Custom hub-mounted license plate bracket with integrated LED plate light.
Brown side stand, welded to frame.
Modified center stand, shortened, powdercoated.

Electrics, Lighting
Custom Dynamics LED taillight, ‘frenched’ into the rear fender.
Motogadget m-Unit control module and m-Lock RFID keyless ignition.
UMC custom headlight with integrated Motogadget speedometer.
WestCo gel battery installed in stainless steel UMC battery box.
Custom wiring loom.
Twin dual-tone 120dB horns, hidden under the fuel tank.
Motogadget m-Blaze LED turn signals front and rear.

Controls
Motogadget Motoscope Classic speedometer integrated into custom headlight.
Nissin 13mm brake master cylinder with 1-into-2 braided stainless steel lines.
Custom direct-mount reservoir.
Nissin clutch lever with braided stainless steel cable.
Custom Momo throttle with braided stainless steel cable.
Classic BSA-style aluminum throttle cable splitter.
Tommaselli natural rubber grips.
Renthal 22mm (7/8″) ultra low handlebars, modified Posh switches, internal wiring.
3″ CRG bar-end mirrors.
Custom cast aluminium top bracket.

Engine & Exhaust
Upgraded EnDuroLast charging system .
Classic metal airbox cover, drilled.
Metal starter cover with painted ‘BMW’ nameplate.
Original 40mm Bing carburetors replaced with 38mm Dell’Orto PHMs
Manual choke levers.
Clear fuel line by Helix Racing.
Upgraded pistons, pushrods, stainless pushrod tubes.
Wrapped modified headers.
Stainless steel Cone exhausts with custom brackets.
Engine stripped and vapor-blasted.
Round valve covers.
Magnum Shielding braided stainless steel spark leads.
Custom stainless steel inlet manifolds.
Custom aluminum airbox tubes.

Bodywork
Original steel petrol tank, stripped, brushed, clear coated, painted by Motojrefinish.
Custom-fabricated UMC roundels.
New Karcoma fuel taps.
Custom steel headlight housing, brushed and clear coated.
Seat upholstered in tan brown leather by Acker Leather Works.
Brushed steel front fender, welded to fender bracket, clear coated.
Custom rear fender, powdercoated in satin black.
Bell Bullitt helmet, yellow shield, painted by Motojrefinish.

THANKS TO
Turk at Turk’s Shop
Nate Diepenbroek Fabrications
Jay at Motojrefinish Paint
Dave at Superior Boxer
Dan at Acker Leather Works
Sean ‘Speedy’ Donahue
Ian Galvin
Winston Black
Emil Lindstrom
Jessica Raya

A custom BMW R100 by Untitled Motorcycles. Illustration by Ian Galvin.