Booda Bike Eccentric Bottom Bracket (EBB) – 24 mm axle
The Possible eccentric bottom bracket is the complete kit for the bottom bracket of a Booda Bike frame: left and right eccentric shells with a spacer, bearings, dust covers and bolts, turned to set the belt tension.
What is in the set
| Part | Qty |
|---|---|
| Eccentric BB shell, left, with holes | 1 |
| Eccentric BB shell, right, with threads | 1 |
| Spacer (centre tube), aluminium | 1 |
| Bearing 6805, 25 × 37 × 7 mm | 2 |
| Dust cover | 2 |
| Bolt | 3 |
Why an eccentric bottom bracket?
Belt tension without sliding dropouts. A Booda Bike has vertical rear dropouts, so the belt tension is set at the bottom bracket instead.
Small, precise steps. Rotating the eccentric moves the crank axle slightly forward or back, which changes the distance to the rear wheel.
A complete kit. Left and right shells, a spacer, two bearings, two dust covers and three bolts in one product.
Tool and bearings sold separately. The Booda Bike eccentric BB tool and the bearing and dust cover set are separate products.
Where it fits
The eccentric sits in the bottom bracket shell and carries the crank axle. The three bolts on the non-drive-side cap lock it in position, tightened to a maximum of 5 Nm.
How it goes together
From the drive side down: a dust cover, a 6805 bearing and the right eccentric shell with threads, then the spacer (centre tube), the left eccentric shell with holes, the second bearing and dust cover. The three long bolts pass through the left shell and screw into the right one, clamping the eccentric in the bottom bracket shell.
Who is it for?
- Booda Bike owners. Who need to replace the whole eccentric bottom bracket.
- Builders and workshops. Who build up a Booda Bike frame and want the full eccentric kit in one product.
Specifications
| Product | Eccentric bottom bracket full kit |
|---|---|
| Shells | Left, with holes; right, with threads |
| Spacer | Aluminium 6061 centre tube, Ø30 × 74.2 mm |
| Bearing | 6805, 25 × 37 × 7 mm (bore × outer diameter × width) |
| Crank axle | 24 mm, as on the FSA Comet aluminium crank |
| Bottom bracket shell width | 86.5 mm |
| Bolts | 3, tighten to a maximum of 5 Nm |
| For | Booda Bike frames |
| Tool | Booda Bike eccentric BB tool (separate product) |
Frequently asked questions
What is an eccentric bottom bracket?
A bottom bracket whose housing can be rotated off-centre. On a Booda Bike turning it moves the crank axle slightly forward or back, which tensions the belt.
What is in the kit?
A left eccentric shell with holes, a right eccentric shell with threads, a spacer, two bearings, two dust covers and three bolts.
How tight should the cap bolts be?
Tighten the three bolts on the non-drive-side cap evenly to a maximum of 5 Nm, as Booda Bike's guides say, and check the belt tension afterwards.
Can I replace only the bearings?
Yes. The two 6805 bearings and two dust covers are also sold as a separate set.
Does it fit the FSA SL-K Carbon crank?
No. This eccentric is made for the 24 mm axle of the aluminium crank. The FSA SL-K Carbon crank has a 30 mm axle and needs the Booda Bike Eccentric BB for a 30 mm axle, with 6806 bearings.
About Booda Bike
Booda Bike builds belt-driven bicycles around steel frames, with Gates Carbon Drive belts and gear hub or single-speed drivetrains. The range includes the Banker, Hiker, Alpine, Atlas, Pulse and Sander models.
The components are standardised so that Booda Bike bicycles can be serviced at ordinary workshops, and parts like this one are also sold separately in the Booda Bike webshop.
Possible is Booda Bike's own component range, used on Booda Bike bicycles and also sold separately.