Extention BB24 Crankset Expand

Extention BB24 Crankset




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Extention BB24 Crankset

- New Extention crankset, fitted as standard on the Extention Rise 20" trials bike.
- Uses the Shimano BSC24 system, which is compatible with all frames that have a 68 mm or 73 mm threaded bottom bracket tube.
- Each crank has been forged from high quality 7075-T6 aluminium alloy, and features a huge pocket at the back of the arm to remove unnecessary material.
- The bottom bracket is made of high strength steel, it’s pressed into the right arm (can't be disassembled), and it has a 24 mm diameter, with Shimano-48 type splines for the left crank.
- Features standard external bearings for the 24 mm axle, Shimano BB24 type.
- The right crank has a standard thread of 1.37'' x 24 tpi, compatible with most traditional threaded sprockets.
-This system allows for increased stiffness and durability of the crankset, while also managing to save some weight.
- The right crank is assembled with the 24 mm axle, and it can’t be disassembled, whereas the left crank is pressed into the axle and kept in place with an M10 Allen bolt.
- Note: the preload bolt of the left crank mustn’t be overtightened, only just to keep the crank in place carefully. The M4 Allen bolt is the one that should be tightened.
- 156 mm crank spacing, measured from the inside edge of the pedal thread to the opposite crank.
- Available only in 165 mm version.
- Does not include a freewheel or bashring.
- Supplied as a kit including cranks, BB, and spacers.

- This kit is compatible with all frames that have a 68 mm or 73 mm threaded bottom bracket tube.
- Not compatible with thread-less bottom bracket tubes.


- 1x Extention bottom bracket.
- 2x Extention crankset.
- 2x BB cups with thread 1.37 x 24tpi.
- 2x 6005RS bearings.
- 1x M19 x 12 mm axle bolts.
- 6x 2.5 mm thick spacers.
- 1x Spacer 7 mm thick.

- Available in 165 mm version.
- The cups have a 1.37×24tpi threads, for 68 mm bottom brackets.
- 24 mm diameter axle.

- 10 mm Allen preload bolt.
- M5x20mm left crank bolts, for a 4 mm Allen key.

- Silver axle, anodized matt black cups and cranks, with white laser etched Extention graphics.

- 727.42 g (Complete kit, including BB and all crank axle spacers).

Additional information
Please note: when fitting or removing these cups, you must use an open BB30 key, and not the usual bottom bracket key.
Please, check all the pictures to see how to install all the components in this kit.

LENGTH 165mm

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