All NJS Light Weight build

Just how light, or heavy, is an all-NJS keirin track bike build?

We had often wondered this, and finally had a chance to find out. As you may know there are no carbon parts in Japanese keirin racing, and titanium is hardly used, either, so this is a proper old-school track bike, although everything you see on it is available new today.

Actually you can buy everything here from or at our Osaka store: Giracha.

We could have started with a lighter frame by going with something tiny, but we wanted to use a frame that is a pretty average size for Japanese pro track racers. This Kiyo is about a 52cm frame with a 53cm top tube. No drillium here either, or cut seat posts or stems. The only ‘chopped’ part was the handlebar, which has about 3cm cut off each end to avoid knee-strike, a common mod for pro racers in Japan.

Anyway it was a beautiful build and came in at 6.90kg.
Here is the build list …

Frame and Fork – Kiyo Miyazawa – 2450g

Headset – Dura-ace HP-7410 – 101g

Bottom Bracket – Dura Ace BB-7700 – 171g

Cranks – Dura-ace FC-7710 165mm – 505g(inc. bolts, caps, etc)

Chainring – Dura-ace 7710 45T – 76g

Chain – DID – 369g (uncut 108link)

Cog – Sugino Gigas 13T – 13g

Lockring – Dura Ace – 15g

Seat Post – Nitto SP-72 27.2mm – 249g

Saddle – Kashimax FG-7P Titanium rail – 253g

Handlebar – Nitto B123aa 350mm – 325g

stem – Nitto NJ Pro AA 80mm – 276g

Grip – Champ 1mm – 25.3g


Rim – Araya Gold 16B – 372g

Hub – Dura Ace HB-7710 – F 204g R 285g

Spoke – Hoshi double butted 15/16 gauge – 457g

Tire – Soyo seamless Red-2 tubulars

Pedals – MKS RX-1 – 279g

Straps – Kashimax KX-SS – 68g

Pedal Clips – MKS Duralumin – 40g


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