Truvativ GXP 83mm Bottom Bracket for SRAM GXP Cranks One Size — Sealed Bearings, Alloy Cups

Truvativ's SRAM/TruVativ GXP 83mm Bottom Bracket is a sealed-bearing bearing set built for 83 mm shells and SRAM GXP crank spindles.

This bottom bracket is engineered for mountain frames that use a wider 83 mm shell to accommodate beefier axles and improved wheel stiffness. It is a brand-specific GXP unit designed to mate precisely with SRAM/TruVativ GXP cranksets: the left bearing accepts the stepped spindle and locates the crank, while the right bearing handles radial loads. The unit features alloy cups, sealed cartridge bearings and English threading for straightforward installation and reliable service life.

Why choose an 83 mm GXP bottom bracket for my bike?

An 83 mm shell is common on frames built for aggressive off-road use and wider axles. Using a matching GXP bottom bracket preserves chainline and crank positioning while taking advantage of the stiffer axle geometry your frame provides. This ensures the crankset and drivetrain run smoothly without unwanted shifts in alignment.

• Fits frames with an 83 mm bottom bracket shell width
• Specifically made for SRAM/TruVativ GXP crank spindles
• Maintains correct chainline for optimal shifting
• Alloy cups reduce weight while sealed bearings resist contamination

How does the GXP bearing design differ from other systems?

SRAM's GXP layout uses a stepped spindle and asymmetric bearing sizing so the left-side bearing is captured between the spindle shoulder and crankarm. The right bearing "floats" on the spindle and handles radial forces only. This arrangement improves load distribution and reduces friction compared with symmetric-bearing designs when paired with GXP cranks.

• Left bearing has smaller inner diameter to fit stepped spindle
• Right bearing supports radial loads only for smoother rotation
• Design reduces drag and optimizes bearing life under pedaling forces
• Works only with SRAM/TruVativ GXP cranksets by design

What are the materials, weight and service features?

The cups are machined from lightweight alloy and the cartridges use sealed steel bearings for long-term reliability. The assembly uses standard English threading to match common frames and claims a total weight of about 118 g (4.2 oz). A two-year manufacturer warranty covers defects in materials and workmanship.

• Material: alloy cups with steel sealed cartridge bearings
• Shell width compatibility: 83 mm
• Threading: English (BSA) for broad compatibility
• Claimed weight: 4.2 oz (118 g); Manufacturer warranty: 2 years

How do I install and maintain this GXP bottom bracket?

Installation requires a compatible GXP crankset and standard bottom bracket tools for alloy-cup cartridge units. Grease the cup threads and torque to manufacturer specs; sealed cartridges need minimal servicing but check periodically for play or roughness and replace bearings as needed.

• Use correct GXP crankset — not compatible with Shimano/FSA spindles
• Apply grease to English threads before installing cups
• Torque to crank and BB manufacturer specifications for secure fit
• Inspect periodically; replace sealed cartridges if bearings feel rough

Who is this for: Riders with mountain frames that have an 83 mm bottom bracket shell and who run SRAM/TruVativ GXP cranksets. This bottom bracket is best for cyclists who want a lightweight alloy-cup, sealed-bearing solution that preserves chainline on wider-shell bikes and reduces maintenance compared to open-bearing setups. It is not suitable for non-GXP crank systems.