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Pro bike: Ramses Bekkenk’s Koga BeachRacer

By:
Cycling News
Published:
December 24, 2013, 14:30 GMT,
Updated:
December 24, 2013, 14:35 GMT
Ramses Bekkenk’s Koga BeachRacer prototype covered in sand after his second victory at the Noordwijk BeachRace

Ramses Bekkenk’s Koga BeachRacer prototype covered in sand after his second victory at the Noordwijk BeachRace

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This article originally published on BikeRadar

The Koga BeachRacer has been making waves since the Dutch brand unveiled a prototype at the beginning of the year. On Sunday 8 December, Koga Mountain Bike Team pro Ramses Bekkenk (Koga MTB team) piloted the 29in wheeled bike to victory in the SRAM-sponsored 52km Noordwijk beach race. It was his second victory in the event, and he beat pros such as local rider Sebastian Langeveld (Orica-GreenEdge).

Bekkenk helped develop the bike especially for the discipline. Essentially it's a cyclocross-29er hybrid. This model – a 54cm prototype – has a slightly longer top tube than the production standard.

Everything about the frame is designed to make it steady when riding on sand. The seat tube angle is 74 degrees, to get the rider right over the cranks in a TT-like position, and the head tube angle is 71 degrees, to help provide a stable platform.

There’s an extra centimetre in the chainstays compared to the standard cyclo-cross frame, and it all adds up to give the bike a wheelbase of around 110cm. It may corner like an oil tanker, says Bekkenk, but on Holland’s wide, windswept beaches, nimble cornering is hardly a priority.

Koga produced the flat drop bars to help riders obtain a stable and aero position on the bike. While the production model is kitted in fairly standard componentry – sand and salt mean it needs replacing a lot and the company wanted to help customers keep costs down – Bekkenk’s BeachRacer was fitted with Shimano Di2 gearing and hydraulic disc brakes. The Di2 is holding up well to the sand, brine and frequent jet-washing, says Bekkenk.

Tyres – a critical choice to cope with the shifting soft sands – are a Schwalbe Super Moto on the back and a slightly narrower, more treaded Schwalbe Thunder Burt on the front, where there’s just enough clearance for the 2.1in width tyre in the custom fork. Bekkenk’s tyre pressure is incredibly low: 0.8 Bar (11.6psi).

A chain and bottom bracket bearings will last about 500km and chainring and cassettes a couple more hundred kilometres. Bekkenk has a Mortop bottom bracket in the English-threaded frame because bearings are cheap and easy to replace.

Gearing is a single 42T front chainring coupled with an e*thirteen chainguide and an 11-28 cassette, which is just enough range to cope with barrelling tailwinds, power-sapping sand, and inevitable headwinds.

BikeRadar had a go at beachracing courtesy of Koga, so stay tuned for a feature on the resurgent discipline. In the meantime, click on the gallery for more photos of this radical bike.

Koga developed the bars specifically for beach races

Koga developed the bars specifically for beach races

Full Specifications

Complete bike specifications

Frame: Koga BeachRacer (54cm custom)
Fork: Koga BeachRacer
Headset: Cane Creek 1-1/8
Stem: Extralite Ultrastem OC (100mm)
Handlebars: Koga custom (40 at bend)
Tape: Deda
Front Brake: Shimano BR-R785 road disc
Rear Brake: Shimano BR-R785 road disc
Shifters: Shimano Di2 R785 (prototype)
Cassette: Shimano Ultegra 11sp, 11-28
Chain: KMC X11sl
Crankset: SRAM XX 42T
Bottom Bracket: Mortop BSA thread
Pedals: Crank Bros Candy 11 with custom cage
Hubs: Shimano HB-CX75 (prototype)
Rims: Notubes Iron Cross
Spokes: Sapim Race and D-Light (mix)
Seatpost: KCNC Ti Pro Lite , 27.2mm, Carbon-Ti seat clamp
Front tyre: Schwalbe Thunder Burt
Rear tyre: Schwalbe Super Moto
Saddle: Selle San Marco Superleggera Aspide
Accessories: e*thirteen chainguide, Timex computer

Critical measurements

Height: 176cm (5ft 9in)
Weight: 68kg (149lb)
Saddle setback: 0mm
Seat-tube (c-t-c): 540mm
Saddle height: 730mm
Headtube length: 100mm
Toptube length (c-t-c); 560mm
Total bike weight: 9.2kg (20.3lb)

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