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Ships within 48 hours · Estimated delivery Aug 11 - Aug 16
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Description
T47 TRAC ExternalTRAC stands for 'Twin Row Angular Contact', and this is exactly the type of bearing you'll find inside the shell of this T47 unit. Instead of a conventional, single row cartridge bearing, we decided to fit out our TRAC unit with bearing cartridges containing two rows of bearings, more evenly distributing the forces generated by the rider's weight, and when pedalling on rough surfaces. This system has huge benefits on bottom bracket longevity, and also
TRAC stands for 'Twin Row Angular Contact', and this is exactly the type of bearing you'll find inside the shell of this T47 unit. Instead of a conventional, single row cartridge bearing, we decided to fit out our TRAC unit with bearing cartridges containing two rows of bearings, more evenly distributing the forces generated by the rider's weight, and when pedalling on rough surfaces. This system has huge benefits on bottom bracket longevity, and also increases pedalling efficiency by improving the overall stiffness of the crankset-bottom bracket interface.
The TRAC bottom bracket system comes ready for use with a 30mm crank axle, but it can be easily converted for use with other axle sizes. Seido offers adapter kits that enable the use of 29mm, 24mm and 24/ 22mm axle diameter configurations. Finding spare bearings for the unit is also made much easier - they are also available at our webstore. No more headache from convoluted processes when trying to figure out bearing specs.
The T47 interface has many benefits, from allowing more space in the area to facilitate internal cable routing, to the greater ease of maintenance when compared to other BB standards.
This is the external version of the TRAC Bottom Bracket, suited to narrower BB shells from 68mm to 73mm. Click here to see the internal version.
In the Summer of 2025, we took a deep dive into the subject of T47 bottom brackets, with our dedicated T47 blog post. Take a look at the blog section of our webstore to check out some of our other articles and interviews too.
COLOUR
Black
CUP MATERIAL
Aluminum
SPINDLE SIZE (mm)
30 mm
SUITABLE BB SHELL WIDTH (mm)
68 mm
TYPE
External
TOOL INTERFACE
T47 52-16 Tool
BEARINGS
3806, 30 x 42 x 10 mm
EXTRA INFO
Adaptable to 29, 24 and 24 / 22 mm with our TRAC spindle adapters
Twin Row Angular Contact Bearing
Includes 6 x 0.5 mm washer, 1 x wave washer
WEIGHT
154 g
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy