bottom bracket/bottom bracket search
Bottom Brackets
| Type | Frame Width | Frame Ø | Crank Ø | Details |
|---|---|---|---|---|
| BSA | 68,0 mm 73,0 mm 83,0 mm 100,0 mm | 34,9 mm | 24,0 mm | Details |
| BB30 | 68,0 mm 73,0 mm | 42,0 mm | 30,0 mm | Details |
| PressFit 30 | 68,0 mm 73,0 mm | 46,0 mm | 30,0 mm | Details |
| BB86 | 86,5 mm | 41,0 mm | 24,0 mm | Details |
| BB92 | 91,5 mm | 41,0 mm | 24,0 mm | Details |
| BB90 | 90,5 mm | 37,0 mm | 24,0 mm | Details |
| BB95 | 95,5 mm | 37,0 mm | 24,0 mm | Details |
| BBRIGHT DirectFit | 79,0 mm | 42,0 mm | 30,0 mm | Details |
| BBRIGHT PressFit | 79,0 mm | 46,0 mm | 30,0 mm | Details |
| 386EVO | 86,5 mm | 46,0 mm | 30,0 mm | Details |
| OSBB Carbon | 61,0 mm | 46,0 mm | 30,0 mm | Details |
| OSBB ALU | 68,0 mm 73,0 mm | 42,0 mm | 30,0 mm | Details |
| Italian | 70,0 mm | 35,9 mm | 24,0 mm | Details |
Bottom Bracket Details:
BSA
| Name: | BSA |
| Frame Width: | • 68,0 mm • 73,0 mm • 83,0 mm • 100,0 mm |
| Frame Diameter: | 34,9 mm |
| Crank Spindle Diameter: | 24,0 mm |
| Replacement Bearings: | 2x Industrial Bearing MR2437 2RS, 37x24x7mm |
| Mounting: | Coil: 1,37in x 24 TPI |
| Description: Originally designed for square taper and involute gearing (Shimano Octalink, ISIS) crank systems, cartridge bottom brackets are today mainly found in the lower priced segments. Because of their closed construction and the screwed joint the bearings are always perfectly aligned and the precision of the bottom bracket shell of the frame loses significance. In 2004 Shimano introduced the today widespread SHIMANO Hollowtech II system. It uses a 24mm crank spindle attached to the drive side of the crank in combination with outboard bearings. The system provides higher stiffness while reducing the weight of the complete driving system. SRAM/TRUVATIV introduced an equivalent system called "GXP" that uses a crank spindle with 24mm diameter on the drive and 22mm on the non-drive side. Standard 30mm cranks (BB30) can not be used in combination with BSA frame interfaces due to the small bottom bracket shell diameter. BB30 Wide, 386EVO cranks with a spindle length of at least 104mm can be used with BSA frame interfaces using special bottom brackets. In such a combination special attention has to be payed to the chain line of the bike. | |
BB30/30A
| Name: | BB30/30A |
| Frame Width: | • 68,0 mm • 73,0 mm |
| Frame Diameter: | 42,0 mm |
| Crank Spindle Diameter: | 30,0 mm 24mm with special bottom brackets |
| Replacement Bearings: | 2x Industrial Bearing 6806 2RS, 42x30x7mm |
| Mounting: | Bearing: 6806 – 42x30x7mm |
| Description: Introduced by Cannondale in 2000 the BB30 system is one of the lightest and stiffest bottom bracket systems. Later Cannondale designed the BB30A standard as a further developement of the BB30 standard, using a asymmetrical bottom bracket shell that is 5mm wider on the non-drive side resulting in an even stiffer system. 6806 industrial bearings with 42x30x7mm are directly pressed into the frame and the cranks with a spindle diameter of 30mm are directly mounted into the bearings. The bottom bracket shell of the frame has to be prepared with high accuracy for bearings being aligned perfectly. Angular Contact Bearings distributing the load better to the bearing balls are highly recommended. For the use with SHIMANO or SRAM/GPX cranks cost-efficient adapter sets are available. Nevertheless threaded bottom brackets are recommended for the use with SHIMANO or SRAM/GPX cranks to compensate possible shell tolerances and to secure a tight fit. For the use of Campagnolo UltraTorque cranks in combination with BB30 bottom bracket shells a special adapter is also available. | |
PressFit 30/30A
| Name: | PressFit 30/30A |
| Frame Width: | • 68,0 mm • 73,0 mm |
| Frame Diameter: | 46,0 mm |
| Crank Spindle Diameter: | 30,0 mm 24mm with special bottom brackets |
| Replacement Bearings: | 2x Industrial Bearing 6806 2RS, 42x30x7mm |
| Mounting: | CUP + Bearing: 6806 – 42x30x7mm |
| Description: PF30 bottom brackets are a further development of the BB30 standard. Bearing cups are pressed into the bottom bracket shell with a diameter of 46mm. Cannondale introduced the PF30A standard later as a further developement using an asymmetrical bottom bracket shell that is 5mm wider on the non-drive side resulting in an even stiffer drivetrain system. The bottom bracket cups are fitted with 6806 Industrial Bearings with a dimension of 42x30x7mm. Cranks with 30mm spindle diameter are directly mounted into the the bearings. The bottom bracket shell of the frame has to be prepared with high accuracy for bearings being aligned perfectly. Angular Contact Bearings distributing the load better to the bearing balls are highly recommended. Threaded Bottom Brackets are available as a recommended high-quality alternative to indepently and not connected cups. The bottom brackets are using two cups that are screwed together ensuring a very tight and secure fit preventing any movement of the cups that often results in a creaky noise. For the use with SHIMANO or SRAM/GPX cranks cost-efficient adapter sets are available. Nevertheless threaded bottom brackets are recommended for the use with SHIMANO or SRAM/GPX cranks to compensate possible shell tolerances and to secure a tight fit. For the use of Campagnolo UltraTorque cranks in combination with BB30 bottom bracket shells a special adapter is also available. | |
BB86 / BB92
| Name: | BB86 |
| Frame Width: | • 86,5 mm |
| Frame Diameter: | 41,0 mm |
| Crank Spindle Diameter: | 24,0 mm |
| Replacement Bearings: | 2x Industrial Bearing MR2437 2RS, 37x24x7mm |
| Mounting: | CUP + Bearing: MR2437 – 37x24x7m |
| Description: BB86 (Road) / BB92 (MTB) are a further development of the BB30 system designed for the use with 24mm crank spindles. Bottom bracket cups are pressed into the bottom bracket shell with a diameter of 41mm. The bottom bracket cups are fitted with MR2437 Industrial Bearings with a dimension of 37x24x7mm. The cranks with a spindle diameter of 24mm are directly mounted into the bearings. The bottom bracket shell of the frame has to be prepared with high accuracy for bearings being aligned perfectly. Angular Contact Bearings distributing the load better to the bearing balls are highly recommended. Threaded bottom brackets are recommended for the use with SHIMANO or SRAM/GPX cranks to compensate possible shell tolerances and to secure a tight fit. For the use with 30mm crank spindles special low profile Industrial Bearings are direcly pressed into the frame. | |
BB90 / BB95
| Name: | BB90 |
| Frame Width: | • 90,5 mm |
| Frame Diameter: | 37,0 mm |
| Crank Spindle Diameter: | 24,0 mm |
| Replacement Bearings: | 2x Industrial Bearings MR2437 2RS, 37x24x7mm |
| Mounting: | Bearing: MR2437 – 37x24x7mm |
| Description: BB90 (Road) and BB95 (MTB) are two systems mainly used by Trek. MR2437 Industrial Bearings with a dimension of 37x24x7mm are directly pressed into the frame. Cranks with a spindle diameter of 24mm are directly mounted into the bearings. The bottom bracket shell of the frame has to be prepared with high accuracy for bearings being aligned perfectly. Angular Contact Bearings distributing the load better to the bearing balls are highly recommended. | |
BBRIGHT DirectFit
| Name: | BBRIGHT DirectFit |
| Frame Width: | • 79,0 mm |
| Frame Diameter: | 42,0 mm |
| Crank Spindle Diameter: | 30,0 mm 24mm with special bottom brackets |
| Replacement Bearings: | 2x Industrial Bearings 6806 2RS, 42x30x7mm |
| Mounting: | Bearing: 6806 – 42x30x7mm |
| Description: BBright is a variation of the BB30 system, that is currently only used by Cervelo. The bottom bracket shell is asymmetrical and 11mm wider on the non-drive side. (45mm on the left side, 34mm on the right side meassured from the frame middle. 6806 Industrial Bearings with a dimension of 42x30x7mm are directly pressed into the bottom bracket shell and the cranks with a spindle diameter of 30mm are directly mounted into the bearings. The bottom bracket shell of the frame has to be prepared with high accuracy for bearings being aligned perfectly. Angular Contact Bearings distributing the load better to the bearing balls are highly recommended. For the use of SHIMANO or SRAM/GPX cranks cost-efficient adapter sets are available. Attention: Standard BB30 bottom brackets can be used. Due to the increased bottom bracket width only special cranks with a longer crank spindle are compatible. | |
BBRIGHT PressFit
| Name: | BBRIGHT PressFit |
| Frame Width: | • 79,0 mm |
| Frame Diameter: | 46,0 mm |
| Crank Spindle Diameter: | 30,0 mm 24mm with special bottom brackets |
| Replacement Bearings: | 2x Industrial Bearings 6806 2RS, 42x30x7mm |
| Mounting: | CUP + Bearing: 6806 – 42x30x7mm |
| Description: BBright is a variation of the PF30 standard that is currently only used by Cervelo. Bottom bracket cups are pressed into the frame shell with a diameter of 46mm. The cups are fitted with 6806 Industrial Bearings with a dimension of 42x30x7mm. The crank spindle with a diameter of 30mm is directly mounted into the bearings. The bottom bracket shell of the frame has to be prepared with high accuracy for bearings being aligned perfectly. Angular Contact Bearings distributing the load better to the bearing balls are highly recommended. As a recommended alternative to the independently pressed in cups, threaded bottom bracket cups are available. The cups are screwed togehter to compensate possible frame shell tolerances and ensure a tight and secure fit of the bottom bracket. For the use of SHIMANO or SRAM/GPX cranks cost-effective adapter sets are also available. Nevertheless threaded bottom brackets are highly recommended for the use of SHIMANO or SRAM/GPX cranks. Attention: Standard PF30 can be used but due to the higher bottom bracket width special cranks with a larger crank spindle length has to be used. | |
386EVO
| Name: | 386EVO |
| Frame Width: | • 86,5 mm |
| Frame Diameter: | 46,0 mm |
| Crank Spindle Diameter: | 30,0 mm 24mm with special bottom brackets |
| Replacement Bearings: | 2x Industrial Bearing 6806 2RS, 42x30x7mm |
| Mounting: | CUP + Bearing: 6806 – 42x30x7mm |
| Description: 386EVO is a variation of the PressFit30 (PF30) system which uses a bottom bracket width of 86,5mm. Bottom bracket cups are pressed into the bottom bracket shell with a diameter of 46mm. The cups are fitted with 6806 Industrial Bearings with a dimension of 42x30x7mm. The crank spindles have a diameter of 30mm and are directly mounted into the bearings. The bottom bracket shell of the frame has to be prepared with high accuracy for bearings being aligned perfectly. Angular Contact Bearings distributing the load better to the bearing balls are highly recommended. As a recommended alternative to the independently pressed in cups, threaded bottom bracket cups are available. The cups are screwed togehter to compensate possible frame shell tolerances and ensure a tight and secure fit of the bottom bracket. For the use of SHIMANO or SRAM/GPX cranks cost-effecitive adapter sets are available. Nevertheless threaded bottom brackets are highly recommended for the use of SHIMANO or SRAM/GPX cranks. Attention: Stadnard PF30 bottom brackets can be used, but due to the higher bottom bracket width special cranks with a larger crank spindle length have to be used. | |
OSBB Carbon
| Name: | OSBB Carbon |
| Frame Width: | • 61,0 mm |
| Frame Diameter: | 46,0 mm |
| Crank Spindle Diameter: | 30,0 mm 24mm with special bearings |
| Replacement Bearings: | 2x Industrial Bearing 6806 2RS, 42x30x7mm |
| Mounting: | CUP + Bearing: 6806 – 42x30x7mm |
| Description: OSBB+Carbon is a variation of the PressFit30 (PF30) system that uses a bottom bracket width of 61,0mm. Bottom bracket cups are pressed into the bottom bracket shell with a diameter of 46mm. The cups are fitted with 6806 Industrial Bearings with a dimension of 42x30x7mm. The crank spindles have a diameter of 30mm and are directly mounted into the bearings. The bottom bracket shell of the frame has to be prepared with high accuracy for bearings being aligned perfectly. Angular Contact Bearings distributing the load better to the bearing balls are highly recommended. As a recommended alternative to the independently pressed in cups, threaded bottom bracket cups are available. The cups are screwed togehter to compensate possible frame shell tolerances and ensure a tight and secure fit of the bottom bracket. For the use of SHIMANO or SRAM/GPX cranks cost-effecitive adapter sets are available. For the use of Campagnolo UltraTorque cranks in combination with OSBB Carbon bottom brackets a special adapter is also available. | |
OSBB ALU
| Name: | OSBB ALU |
| Frame Width: | • 68,0 mm • 73,0 mm |
| Frame Diameter: | 42,0 mm |
| Crank Spindle Diameter: | 30,0 mm 24mm with special bottom brackets |
| Replacement Bearings: | 2x Industrial Bearing 6806 2RS, 42x30x7mm |
| Mounting: | Bearing: 6806 – 42x30x7mm |
| Description: OSBB is a variation of the BB30 system, that is currently only used by Specialized. Although the dimensions are identical, the tolerances are smaller and the distance of the two clips varies by 0,5mm. 6806 Industrial Bearings with a dimension of 42x30x7mm are directly pressed into the bottom bracket shell. The cranks have a spindle diameter of 30mm and are directly mounted into the bearings. The bottom bracket shell of the frame has to be prepared with high accuracy for bearings being aligned perfectly. Angular Contact Bearings distributing the load better to the bearing balls are highly recommended. For the use of SHIMANO or SRAM/GPX cranks cost-effective adapter sets are available. Nevertheless threaded bottom brackets are highly recommended for the use of SHIMANO or SRAM/GPX cranks, to compensate possible bottom bracket shell tolerances. For the use of Campagnolo UltraTorque cranks in combination with OSBB Alu bottom brackets a special adapter is also available. | |
Italian
| Name: | Italian |
| Frame Width: | • 70,0 mm |
| Frame Diameter: | 35,9 mm |
| Crank Spindle Diameter: | 24,0 mm |
| Replacement Bearings: | 2x Industrial Bearing MR2437 2RS, 37x24x7mm |
| Mounting: | Coil: 36mm x 24 TPI |
| Description: The italian bottom bracket standard is mainly used by italien manufacturers. The bottom brackets have right handed threads on both sides and can be identified very often over a description that contains "36 x 24". | |
