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Shimano SM-HB20 Center Lock Rotor Lockring – external splines

6.65 USD
Center Lock lockring with external splines – holds any Center Lock disc rotor on the hub.
SKU: ASMHB20
Available for backorder
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International Shipping
14-day refund
Lifetime support
Three years warranty

The Shimano SM-HB20 is a Center Lock rotor lockring with external splines, tightened with a Hollowtech II bottom bracket tool. It holds any Center Lock disc rotor on the hub – we keep it in stock because a lost or damaged lockring should never keep a bike off the road.

Shimano SM-HB20 Center Lock lockring with external splines and its washer
SM-HB20 lockring and washer.

Why the SM-HB20?

  • Fits every Center Lock rotor. Holds any Center Lock disc rotor on a Center Lock hub.
  • External splines. Tightened from the outside with a Hollowtech II bottom bracket tool – the standard on thru-axle hubs, where a cassette-type tool cannot pass over the axle.
  • Secure fit. With the washer and 40 N·m torque the rotor stays put.
  • Genuine Shimano. Lockring and washer in the box.
Three-step diagram of mounting a Center Lock rotor with a lockring

Fitting a Center Lock rotor

1 – slide the rotor onto the splined Center Lock interface of the hub.

2 – fit the lockring with its washer over the rotor.

3 – tighten with a Hollowtech II bottom bracket tool to 40 N·m.

Who is it for?

  • Riders fitting new rotors. Center Lock rotors are often sold without a lockring.
  • Workshops. Replacing lost, damaged or over-tightened lockrings.

Specifications

ModelShimano SM-HB20
Rotor mountCenter Lock
SplinesExternal
ToolHollowtech II bottom bracket tool (e.g. Shimano TL-FC36)
Tightening torque40 N·m
In the boxLockring, washer

Frequently asked questions

Does it fit my rotor?

Yes – it fits every Center Lock rotor. The external-spline lockring is the standard on thru-axle hubs, where a cassette-type tool cannot pass over the axle.

Which tool do I need?

A Hollowtech II bottom bracket tool such as Shimano TL-FC36, with a torque wrench (40 N·m).

About Shimano

Shimano was founded in 1921 in Sakai, Japan, as a one-man workshop making freewheels. Today it is the world's largest maker of bicycle components, and its standards – Center Lock rotors, Hollowtech cranks, Rapidfire shifters, mineral-oil hydraulic brakes – are what most bikes are built around.

At BoodaBike we use Shimano internal gear hubs and hydraulic brakes on our own belt-drive bikes, and we stock the service parts we use in our own workshop.