GEROS Road Wood Bike

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PRESS after TAIPEI-Cycle-Show 1-5 March 2016 in Taiwan

* BikeRUMOR (in USA on 28 March 2016):

* Bikeradar (in UK on 3 March 2016):

* RadMarkt (in Germany on 12 April 2016):


The test-prototype was hand-built by Reinhold Schwemmer to test the functionality of the bike. He tested the bike for 10,000 Km (6,000 miles). The test was very important for designing the GEROS Wood bike.

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The GEROS Wood bike:

The GEROS road racing frame is made out of very high quality New Zealand timber. We are talking about wood which has been used for hundreds of years in boat building and house building. We are talking about boats and houses which have lasted for up to 300 years life.

At the same time the GEROS road bicycle is made using the most modern technology as used in the airplane and car building industry. The design of the bicycle is based on 26 years of bicycle engineering knowledge. It´s computer designed (CAD) with 3D modelling and computer aided manufactured (CAM) with lots of computer aided routing (CNC). Just to have an idea of the amount of work: each frame needs more CNC cutting than what is needed to make one mould for manufacturing a carbon composite frame.

2. Layout for CNC plank routing

150409 routing basic

The Designer of GEROS Wood bike

German Eslava has been involved in cycling for over 40 years not only racing but mainly as an engineer. After been involved in computer work he has designed bicycles for the last 26 years. German has designed all type of bicycles e.g. MTB, touring-bikes, e-bikes, road-bikes, recumbents and velomobiles. During the last 10 years he concentrated his development work more and more onto road-racing bicycles a passion from his youth times. He has been working with different materials from steel, over titanium, aluminium and has work a lot with carbon frames. His desire to make the best road racing bike out of all worlds brought him to work with wood. He has been testing prototypes with his long-time partner Reinhold Schwemmer in Germany and in Italy now.

3. Planks routed

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Why a wood bike?

Wood has the best natural properties. Depending on the timber type it is strong, flexible and it damps any strong hit. Wood is theoretically the best material for building a bicycle frame. Its main drawback is the difficulty to elaborate a high-end racing bike and therefore its cost. But one very important fact is that a bicycle frame made of wood is simply astonishingly beautiful.

4. Layout for CNC routing of Triangles


Why New Zealand?

Nowadays German expends most of his time in New Zealand and Kiwis have been working with very high quality timbers for all their history. The beautiful New Zealand islands are one of the last surviving heavens for Green live in this world. There are large amount of native timbers in New Zealand, some of them are well known internationally e.g. Kauri, Totara, Rimu, Matai, etc. The knowledge of New Zealanders on elaborating timber is enormous in particular for boat building. The Maoris, the indigenous inhabitants from New Zealand came to the islands by wooden ocean-going canoes from the eastern Polynesian islands around 1280 AD. The British settlers who arrived to New Zealand on the 18th century were skilled workers of timber.

6. Triangles assembled

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Why Road Racing bikes?

A high-end road racing bicycle is one of the most sophisticated to build. It requires a very precise work to match all technical requirements to archive a perfect ride but at the same time to keep a low weight. The weight target of a racing bicycle is 6.8kg – according to the UCI, the international bicycle association governing road races – and the GEROS Wood bike fulfils it perfectly. The GEROS wood frame weighs only 1.7kg (small size) similar to high-end stainless steel frames. The complete bike weighs only 6.7kg (without pedals) of course all depends on the components used.

7. Layout for CNC internal routing

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New Zealand partners

To produce the best wood bike possible fulfilling all modern top technical requirements German joined forces with a local joinery in New Zealand, the FUSION Joinery in Napier. Jeff Young, the manager of the company, has more than 30 year experience in woodwork and in native timber. Although Jeff is specialized on the production of high-end kitchens he is rather open to new ideas and he is at home when using jigs for hand routing.

Since the GEROS wood bike is designed to archive the highest technical requirements possible German worked with Brendon Trower, the manager of Tru-Tech in Napier, a company specialized on composites (carbon, fiber-glass, etc.) and repairs of composite parts. Brendon has an enormous knowledge in CNC timber routing out of his work in boat building as well. He is on top of the game when it comes to interface sophisticated 3D drawings (Solid Work) into modern CNC 3D routers.

8. Tringles routed

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Procedure for manufacturing the GEROS Wood bike

For safety reasons an additional carbon fabric layer is use to fix the aluminium head tube inlets within the frame. The aluminium bottom bracket inlet is bonded with a special mix of epoxy resin with carbon powder.

After CNC cutting the frames are finished by hand using a patented procedure. It involves the bonding of timber fiver grains of the thin frame walls with a thin carbon fabric layer. This work is done to hold the fiver grains in place when riding in extreme weather conditions.


The painting of the frame is very sophisticated and follows the same procedure as on boat building with up to seven layers.

The GEROS bike used electronic gears with built-in battery, internal cabling, etc., as any high-end road bicycle nowadays.

10. Chain-stays and Seat-stay routed / Prices

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Prices for GEROS frame/fork/head-bearings/seat-clamp set:

* frame made of New Zealand RIMU or MATAI        US$ 6,950 (FOB New Zealand) ca. EUR 6,380 / GBP 4,870 + local Value Added Tax.

* frame made of New Zealand KAURI or TOTARA   US$ 7,950 (FOB New Zealand) ca. EUR 7,300 / GBP 5,570 + local Value Added Tax.

MATAI  density= 610kg/m²    hardness=3.4 (high)   durability class=3 (OK)
RIMU  density= 510-600kg/m²    hardness=3.5 (high)   durability class=3 (OK)
TOTARA  density=480kg/m²  hardness=2.4(medium)  durability cl.=1(very high)
KAURI   dencity= 545-550kg/m²   hardness=4 (high)   durability class=4 (low)

Lead Times

Actual Lead Time for frame set delivery is 4 months after order confirmation.

Delivery of complete assembled bikes is also possible. In this case our frame/fork set will be sent to Taiwan for assembly with the requested group, wheels and other components. Prices are according to the components ordered.

11. GEROS Road Bike Geometry


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The geometry of the GEROS Wood Bike is the same as on modern high-end road racing bicycles. Each frame is built individually according to orders. There are 5 standard sizes with personalized seat-tube high length. Optionally any personal geometry can be ordered.

The geometry of the GEROS Wood Bike is as follows:

BB to Top Tube Top Tube Length Head Tube Length Head Tube Angle Seat Tube Angle Fork offset Fork Length Chain stay
490 515 105 72∘ 74∘ 43 370 405
520 530 120 72∘ 74∘ 43 370 405
540 545 140 72.5∘ 73.5∘ 43 370 405
560 560 160 72.5∘ 73.5∘ 43 370 405
585 580 180 73∘ 73∘ 43 370 407

Please notice that the client has to define the seat-tube length according to his body, legs and way of cycling.

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