Handmade full chromoly road bike "KOGO"

Road bikes have changed significantly in recent years.
Carbon frames are now mainstream, disc brakes are standard equipment, and wheels feature thru-axles.

A new category, gravel roads, has also emerged, bringing more excellent models that can be ridden both on and off-road.

Mass-produced bikes increasingly feature frames with dedicated stems and seat posts, as well as inner cable designs where all cables run internally.

Amidst these changes, Grumpy has begun to carry the latest road bike manufacturers.

Having experienced the amazing qualities of modern technology, we wondered if we could incorporate this technology into traditional road bikes.

Of course, this was done while keeping our core concept of "long-term usability" in mind.

This was the genesis of our original road bike, the [KOGO].

The model name KOGO is derived from "Kogo," the name of the area where Grumpy is located.

Kogo also means "metal horse," which was a perfect name for a bicycle. 

 

Specifications

• Handmade one by one in Hiroshima.
• Frame and fork are chromoly tubing.
• Rim brake specific frame.
• Brakes are compatible with arch lengths of 51mm or more.
• Maximum tire size confirmed up to 700x30c.
• Two bottle cage mounts are equipped, one on the upper downtube and one in front of the seat tube.
• Head tube is 1-1/8 oversized.
• Seat tube inner diameter 27.2mm.
• Front end 100mm, rear end 130mm, QR type.
• Bottom bracket is 68mm threaded type.

 

Frame options

 

About frame size

Frame size can be freely ordered through customization.

You can order in 1mm increments to your desired dimensions.

The following two points allow custom size orders:

① Seat tube length (C-T)

This is the distance from the center of the BB to the top end of the seat tube.

② Top tube length (C-C)

This is the distance from the intersection of the top tube and head tube center to the intersection of the top tube and seat tube center.

Below is a table of recommended heights and sizes. Please refer to it.

KOGO is available in two basic colors.

Basic Color ①: Pearl White

A white and silver gradient paint that shines like freshly cooked rice.

Pearl white is a paint that achieves its brilliance because it involves more layers than usual, with a pearl coat applied over the base color and then sealed with a clear coat.

To avoid a monotonous appearance, we applied a silver gradient paint to the lower part of the frame, matching the logo color.

We even added some sparkle like sprinkles!

 

Basic Color ②: Blue Metallic

Painter Takenoshita wanted to create a refreshing, timeless blue metallic.

The image for this color came from the beautifully clear, almost annoyingly bright blue sky visible from the third floor of the scorching hot paint factory.

As a rebellion against the perfectly clear sky, he added pearl white, evoking the image of clouds illuminated by the sunlight.

This blue color is more than just beautiful and vibrant; it embodies the painter's feelings.

 

 

Price

KOGO Road Bike Frameset

Basic frame colors: Pearl White, Blue Metallic

Basic price: 198,000 JPY (tax included) 

Painting in other colors is also possible. Please consult us.

 

About ordering

Please consider your desired frame dimensions, frame options, etc., and contact us via this page.

 

◆Parts that go well with KOGO

When assembling a new KOGO, the following parts are a great match.

Like the KOGO frame, these parts are traditional and have been loved for many years.

The classic lightweight saddle loved for many years: [Selle Italia FLITE Series]

 

◆Related Youtube videos

We have also released YouTube videos on the making of KOGO. Please refer to them below.

[Frame Public Development 001] Thinking about the concept of a handmade road bike

[Frame Public Development 002] Are chromoly frames stiff or flexible?

[Frame Public Development 003] The surprisingly deep story of "chromoly" as a material

The first prototype of our chromoly road bike is complete!

Test ride review of the first prototype chromoly road bike

Head-to-head hill climb battle with Elephant Cycle at Gokurakuji

  [Road Bike Public Development 004] About the newly completed chromoly road bike