Shimano Deore BB-MT501 MTB bottom bracket - EBBMT501B

The Deore BB-MT501Shimano (part no. EBBMT501B) is a Hollowtech II bottom bracket designed for MTB, gravel and trekking bikes fitted with a BSA threaded frame. It ensures smooth rotation and excellent water resistance, guaranteeing efficient and long-lasting pedalling even in challenging conditions.

Part of the Shimano Deore range, it is designed to offer an excellent balance between performance, reliability and low maintenance, thanks in particular to its external bearings, which are optimised to withstand water, mud and dust.

Compatible with Shimano cranksets featuring a 24 mm axle (Hollowtech II), it fits frames with a width of 68 mm or 73 mm, making it a very common standard on modern mountain bikes.

Technical specifications

• Brand: Shimano
• Range: Deore
• Model: BB-MT501
• Part number: EBBMT501B
• Type: bottom bracket with external cups (Hollowtech II)
• Thread: BSA (1.37 x 24)
• Frame compatibility: 68 mm / 73 mm
• Compatible axle: 24 mm Shimano Hollowtech II
• Use: MTB / gravel / trekking
• Materials: aluminium + engineering polymer
• Enhanced sealing for off-road use

Key features

• Excellent protection against mud and moisture
• Smooth rotation for efficient pedalling
• Wide compatibility with Shimano 24 mm cranksets
• Easy-to-maintain standard BSA mounting
• Good durability for regular mountain biking use
• Excellent value for money within the Deore range

FAQ

What is the Shimano BB-MT501 used for?

It allows a Hollowtech II crankset to be fitted to a BSA threaded frame whilst ensuring smooth and long-lasting rotation.

Is it compatible with road bikes?

Yes, but it is primarily optimised for mountain biking and gravel riding. It can be used on road bikes if the crankset is 24 mm compatible.

What is the difference compared to a road bottom bracket?

Mountain bike versions such as the BB-MT501 prioritise waterproofing and durability, whilst road models are more focused on lightness and pure performance.

Is it compatible with all Shimano cranksets?

It is compatible with most Shimano Hollowtech II cranksets (24 mm axle), including Deore, Alivio, ZEE, etc.

Are spacers required?

Yes, depending on the frame (68 or 73 mm), spacers may be required for correct fitting.