Ideal for riders replacing a worn BB86 road bottom bracket and wanting a genuine Shimano option for a 24 mm HOLLOWTECH II crank without moving to a more expensive thread-together or ceramic setup.
The Shimano TIAGRA BB-RS500-PB is a press-fit bottom bracket for frames with an 86.5 mm shell width and a 41 mm inner diameter, built around Shimano’s 24 mm HOLLOWTECH II road crank standard. If your bike already uses this format, it’s the sensible replacement when the old unit feels rough, noisy or overdue for renewal.
What we like here is the balance of simple compatibility, low fuss servicing and the kind of smooth, reliable performance most riders want from a bottom bracket. Shimano’s new seal construction is aimed at durability, while the press-fit cup design keeps the package light and tidy inside a BB86 frame. For riders on Tiagra, Sora, Claris and other compatible Shimano 2-piece road cranks, it’s an easy match rather than a guesswork purchase.
The key thing is buying the correct standard. This bottom bracket is for BB86 / PF41-style 86.5 mm road shells with Shimano 24 mm cranks. It is not the right choice for Trek BB90, BB30, or larger-diameter spindle systems such as SRAM DUB without a different bottom bracket. If your frame and crank standard line up, this is the kind of fit-and-ride replacement that makes a lot of sense.
BB86 road fit
Designed for 86.5 mm press-fit road shells, making it the correct choice for BB86-style frames that use a 41 mm bore.
HOLLOWTECH II compatibility
Built to suit Shimano 24 mm integrated axle cranks, so it matches common Shimano 2-piece road cranksets cleanly.
New seal construction
Updated sealing helps keep out dirt and water, which matters for year-round riding and wet road use.
Long-lasting performance
A practical replacement for tired or gritty bottom brackets when you want smooth running and dependable everyday use.
Lightweight resin cup design
Uses resin press-fit cups, keeping weight down and offering a frame-friendly interface for press-fit installation.
Complete assembly
Supplied as a complete press-fit assembly with left and right cups plus the internal cover and sealing parts.
Genuine Shimano replacement
A safe, straightforward pick when you want to stay with Shimano standards rather than experimenting with conversion systems.
General
Features
HOLLOWTECH II
This design is built around a 24 mm axle integrated with the right crankarm to balance stiffness, strength, low weight and smooth rotating performance. For you, that means stable pedalling feel and efficient power transfer on every ride.
Great for
Maybe not for
Check your frame before ordering: this bottom bracket suits a 41 mm internal diameter press-fit shell with 86.5 mm width. It is intended for Shimano 24 mm HOLLOWTECH II cranks. Installation and removal require dedicated press-fit tools, and Shimano lists TL-BB12 for installation and TL-BB13 for removal.
vs Shimano SM-BB72-41B
A higher-tier Shimano press-fit road bottom bracket in the same 86.5 mm BB86 category. It’s lighter on Shimano’s published figures, but this BB-RS500-PB keeps the genuine Shimano fit most riders want at a more value-focused level.
vs Shimano SM-BB92-41B
Another Shimano press-fit option often cross-shopped because it shares the 41 mm press-fit format. It is lighter, but it sits above this model and buyers still need to match the correct frame and crank setup carefully.
vs Token Ninja BB86/BB89.5/BB92 24 mm
A popular upgrade alternative for riders specifically trying to reduce press-fit creaks or wanting easier workshop handling. The Token uses a thread-together design rather than a standard Shimano-style press fit.
The shell standard matters more than the groupset name
This bottom bracket suits a 41 mm press-fit shell with 86.5 mm width. If the frame standard is wrong, the fact that your bike has Shimano road cranks won’t save the fit.
Best matched to Shimano 24 mm cranks
This is the clean option for HOLLOWTECH II road cranks with an integrated 24 mm axle. If you’re changing to DUB or a 30 mm spindle crank later, you’ll need a different bottom bracket.
Press-fit installs need the right tools
A proper bearing press and the correct drifts matter here. Press-fit systems work well when the cups go in straight and the frame shell is in good condition.
A fresh BB often fixes roughness better than servicing
Once a press-fit unit has been knocked out, replacement is usually the sensible path. If your current bottom bracket feels gritty or noisy, fitting a new one is often the cleaner solution.
Shimano is a Japanese component brand founded in 1921 in Sakai, Osaka. The company began with bicycle component manufacturing and has grown into a global business focused on bicycle components, fishing tackle and rowing equipment, while keeping its headquarters in Sakai.
In cycling, Shimano is best known for building complete component ecosystems that span road, mountain, gravel, commuting and e-bike use. Its range covers drivetrains, brakes, wheels, pedals, shoes and related parts, and the brand has had a long presence in Australia through a local business established in Sydney in 1992.
