Vintage Shimano Dura Ace NJS Stamped Bottom Bracket: BB-7400, 112mm x 68mm (no bearings)
Rare track/pista bottom bracket from the Dura Ace 7400 series of the 1980's and early 1990's. This one is stamped NJS on both cups, and is Keirin approved. This does not include bearings, but uses standard 1/4" bearings, 11 per side. Any bike shop can provide these for a dollar or two.
Near mint very lightly used shape, only a few tiny marks. Plastic center shell piece has just a bit of decal wear but no cracking. No bearings.
- Length: 112mm (112x68)
- Threads: English 1.37 x 24
- JIS square taper