DAIKOKU

Technical details we would like to highlight
DAIKOKU has been made by NJS*（KEIRIN) Builder-Murayama.
More than 90% of bikes produced by him use the KEIRIN (track race) frames. In most cases, the racer brings in their currently used frame, bike, and geometry table. We then create the bike based on the existing model’s dimensions. However, since some racers favor specific tactics such as precedence, pursuit, etc., according to the leg strength of the racer, we determine the geometry and tube suitable for the rider’s strategy.
If necessary, we will digitize the characteristics of the currently used frame to create a new one. A racer may request a frame in response to the feeling that arises from slight differences in the positioning of the steering wheel and saddle.
In that case, we will decide by CAD the precise magnitude of the changes necessary for the racers. In addition, we may receive consultation in fields that cannot be quantified, such as living environment and psychological comfort. These work processes take time, but it is important for professional bicycle racing.

Racers place great importance on the dimensional accuracy of the frame, especially the front center where error due to heat effect is concentrated. Since the frame always shrinks due to the heat of brazing, it does not fit the dimensions set in the jig. Minimizing this error is a very important task.
There are also differences depending on silver wax, brass wax, and the order of brazing. It is not possible to create a highly accurate frame with only experience and intuition. Therefore, predicting the error that occurs in advance, setting based on it, and past data are also very important.
By doing that adjustment work, the final error after brazing can be minimized.
This also minimizes residual stress. The frame is delicate enough to change with the hand temperature. Therefore, it is not easy to braze the frame at a temperature close to 1000 degrees and fabricate it with an accuracy of 1 mm or less. It is a serious challenge for the builder.
Since the frame of DAIKOKU uses almost exactly the same production method as the KEIRIN frame, you can feel the high performance of the KEIRIN frame.


Paint/design/look, any thoughts on this frame
There are many bicycles of attractive design in UK and other European countries.
Therefore, Maruya made its design using traditional Japanese aesthetics known as the 'Universal Elegance ' design concept. It matches any other historical designs from around the world, whether they be from London town, fashionable Paris, or the old capital Kyoto. It is finished in a design that makes you feel its elegance. Painting also uses Japanese traditional crafts like 'lacquered （urushi）painting', 'Makie', etc. as its motifs. 'Lacquer（urushi）' has long been a valued as the most beautiful paint in Japan. However, because it uses sap, it is slightly discolored with light, and because it is easily scratched, we used a highly durable urethane paint that reproduces the color of lacquer (urushi). Since it is difficult to reproduce the color of lacquer(urushi) with urethane paint, we were supervised by an old urushi factory, Yamakyu of Sabae (Fukui prefecture.)
These colors, including gold, are traditional Japanese colors that differ slightly from European colors.

Award at Bespoked 2019
Maruya was honored to receive the outstanding Finish / Paint Award at the UK Handmade Bicycles Show (BESPOKED) 2019. We will create charming bicycles for bike lovers around the world.