Precision Hydration makes fuelling products for endurance athletes, and when the British company wanted a motorcycle of its own, it handed the job to Side Rock Cycles. The result is this custom BMW R100R street scrambler, built around one of the final air-cooled boxers.
BMW built the R100R from 1991 through 1996, and the Paralever version counted among the closing iterations of the airhead boxer. Side Rock already had a suitable donor in the workshop, so the bike went straight onto the bench.
The airhead twin has served custom builders well, from the R100RS cafe racer by Minami Motorcycle to this project. Precision Hydration’s brief emphasized road performance over trail ability.

From Paralever to Street Scrambler
Side Rock replaced the original wheels with refurbished 17-inch spoked rims from a BMW R1200R. Dunlop Mutant rubber gives the set a chunky, contemporary footprint.
Up front, the forks were rebuilt and shortened, while the fully adjustable rear shock was stripped and Cerakoted black. Its spring received an orange powder coat that ties into Precision Hydration’s corporate colors.
The frame and swingarm were stripped, fitted with fresh bearings, and powder coated satin black to suit a new stepped dual-seat subframe. Glenn Moger shaped a bespoke aluminum seat pan, wrapped in brown leather with contrasting stitching and embroidered detailing.
An earlier BMW Monolever tank, chosen for its cleaner shape, was modified to fit the chassis. Armours of Bournemouth built the low stainless exhaust, finished in black Cerakote.
Flatslides and Hidden Electronics
Side Rock had good results with Keihin FCR flatslide carburettors on earlier Moto Guzzi builds, so the shop tried them on the boxer. The swap from the original Bing units brought crisp fuelling across the rev range.
Renthal Fat Bars and an Accossato radial master cylinder with adjustable folding levers sit up front. Brembo calipers, larger discs, and Venhill braided lines handle the stopping.
A Motogadget m.unit Blue runs keyless ignition and the full LED lighting, including compact three-in-one rear lights. An Antigravity lithium battery sits in one of Side Rock’s signature under-transmission boxes, all wired through a custom loom.
The orange spring against all that satin black is my favorite detail on the whole bike.
Wicked Coatings painted the bodywork in company colors against a tight Distinguished Gentleman’s Ride deadline. Afterward, company representative Andy rode it to the annual Airheads gathering at Sammy Miller’s Motorcycle Museum, where it took Best Custom.
Source: Pipeburn

