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SM-BB52 Deore outboard bearing bottom bracket set, British thread, 83 mm

• Hollowtech II outboard bearing design for superior stiffness - Shimano's Hollowtech II system positions bearings outside the bottom bracket shell, creating a wider bearing stance for increased rigidity and more efficient power transfer under high torque loads

• Deore-level reliability for demanding trail riding - Engineered to Shimano's Deore standards, providing dependable performance for trail, all-mountain, and aggressive recreational riding without the premium price of higher-tier groupsets

• British/English threaded compatibility (83mm) - Designed for modern mountain bike frames with 83mm wide English/BSA threaded bottom bracket shells (1.37" x 24 TPI), commonly found on boost and super boost MTB frames

• Sealed cartridge bearing construction - High-quality sealed bearings protect against water, mud, dirt, and trail debris, ensuring smooth rotation and extended service life even in harsh off-road conditions

• Simple installation and low maintenance - Straightforward threaded design allows for easy installation with standard bottom bracket tools, while the sealed cartridge system requires minimal maintenance for long-lasting, trouble-free performance

Brand: Shimano

Type: English

Availability: In stock Out of stock

Delivery: 2-3 working days

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Regular price: £24.89
Sale price: £24.89
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Description

Genuine Shimano HollowTech II bottom bracket assembly

Set includes left and right hand cups, spacers, inner cover, and inner O-rings

Sealed cups keep out dirt and water

Maintenance free

Compatible with 83 mm shells

Durable anodised finish

Easy installation

Product Type Bottom Brackets

Discipline MTB

Colour Black

Size 83 mm

Axles Standard 24mm

Bottom Bracket Type BSA Threaded

Width 83 mm

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FAQ

Q: What frames require an 83mm bottom bracket instead of the standard 68/73mm? A: The 83mm shell width is designed for modern mountain bikes with boost (148mm rear) or super boost (157mm rear) hub spacing. These wider frames require an 83mm bottom bracket shell to accommodate the increased chainline needed for proper drivetrain alignment with wider rear hubs. Check your frame specifications or measure your bottom bracket shell width to confirm you need 83mm.

Q: What Shimano cranksets is the SM-BB52 compatible with? A: The SM-BB52 is compatible with all Shimano Hollowtech II mountain bike cranksets that use a 24mm spindle, including Deore, SLX, XT, XTR, and other MTB-specific models. It will also work with some third-party cranksets designed for Shimano's Hollowtech II standard. Ensure your crankset has the 24mm hollow spindle characteristic of Hollowtech II.

Q: What does "outboard bearing" mean and what are the benefits? A: Outboard bearing design positions the bearings outside the bottom bracket shell rather than inside it. This creates a wider bearing stance, which increases stiffness and improves power transfer by reducing flex under pedaling loads. The larger bearing placement also allows for a larger spindle diameter (24mm), further enhancing rigidity while keeping weight low.

Q: How long will this bottom bracket last in typical mountain biking conditions? A: Service life depends on riding conditions and maintenance. In typical trail riding, expect 3,000-8,000 miles. Aggressive riders in wet, muddy conditions or those who frequently pressure wash their bikes may see 2,000-4,000 miles, while riders in dry conditions with regular cleaning can exceed 8,000 miles. Replace when you notice creaking, rough rotation, lateral play in the cranks, or resistance when spinning.

Q: What tools do I need to install this bottom bracket? A: You'll need a Shimano Hollowtech II bottom bracket tool (TL-FC32 or compatible), a torque wrench, and waterproof grease for the threads. Apply grease to the shell threads and faces to prevent creaking. Torque the drive-side cup to 35-50 Nm and properly adjust the non-drive side preload according to Shimano's specifications. If you're unfamiliar with Hollowtech II installation and preload adjustment, professional installation ensures optimal performance and longevity.