The ThreadFitâ„¢24 BB is designed and manufactured with durability, serviceability, and quietness in mind. It creates a precise and functional interface between the BB shell of the frame and the cranks, ensuring smooth rotation without interference with the cranks. The ThreadFitâ„¢24 BB is available in a series of BB conversion kits for use with a wide variety of road bike and MTB cranks.


The BB itself does not come with a fit kit. Please purchase the BB Fit Kit that corresponds to the crankset type and BB shell width to be used.
>>> BB Fit Kit #4
Kit for 24mm spindle crankset.Compatible BB: ThreadFit 24, T47 24i, T47 24x
BB shell widths: 68mm, 73mm, 73mm SB+, 86.5mm, 92mm SB+
>>> BB Fit Kit #6
Kit for SRAM GXP cranks.Compatible BB: ThreadFit 24, T47 24i, T47 24x
BB shell width: 68mm, 73mm, 73mm SB+, 86.5mm, 92mm SB+
- We ship within 1-2 business days after receiving your order (payment). (Basically, orders placed before 12:00 p.m. are shipped the same day.)
- Messenger delivery is available within Nagoya City only.
- We ship every day from Monday to Sunday, except for temporary holidays.
- Available delivery areas: All over Japan and the world.
- Please note that delivery may be delayed due to credit card processing status. If you would like to specify the delivery date and time, please fill in your request in the additional information in the shopping cart.
- The product will be shipped from Circles.
- Please contact the shipping company in case of damage or loss during shipping.
Regarding the delivery of completed vehicles
- Please note that a separate shipping fee of 6,600 yen (including tax) will be charged for shipping a completed vehicle.
- After receiving your order, we will perform a final check and ship the completed car, but it may take 1-2 weeks. Please understand.
- Some parts of the bike will be removed for packing. We strongly recommend that you have your bicycle assembled at your nearest bicycle store.
- We will inform you of the delivery date and other details by e-mail.
- We apologize for any sales discrepancies at the store.
Regarding the delivery of frame sets
- Nationwide flat-rate shipping: 3,300 yen (tax included) (However, an additional fee will be charged for delivery to Okinawa and remote islands.)
- We will inform you of the delivery date and other details by e-mail.
- We will provide the pre-treatment of facing and tapping for the frame sets purchased at our store as a service. We will inform you separately after purchase.
- We can also install a headset and BB for a fee, so please feel free to contact us.