You need a bottom bracket.Why not run a bsd bottom bracket?!This kit includes a nice touch in the form of a hollow crank bolt!! - Precision sealed cartridge bearings- CNC machined ‘tri-spoke’ spacers to match original sprocket design- Spacer kit to ensure correct fit- Hollow CrMo crank arm bolt- 19mm or 22mm versionsSpainish - 19mm – 111g22mm – 100g Mid - 19mm – 160g22mm – 142g
BSD started off just making sprockets, despite the fact they've hugely expanded their range, they still make some of the nicest sprockets around. Here's the Superlight: CNC'd 7075 aluminium sprocket from BSD. The Superlite sprocket is 8mm thick around the edges for strength and tapers to 6mm in the middle to save weight. Comes with two top hat washers to fit all cranks.
Specifications
Brand: BSD
Colour: Black, Grey, Polished, Red, Blue, Purple, Gold
Size: 29t, 23t, 25t, 28t, 30t
Website: www.bsdforever.com
Weight: 70g