—$5.50

The AheadSet Starnut is great for replacing old or broken star nuts. AheadSet Starnuts Headset Small Part UPC: 840226002330

by AheadSet

—$78.99

Cane Creek 40-Series. The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Item Specifications Color Black Weight 89g Material AL-6061 Crown Race 39.7 Stack Height 28mm Bearing Type Black Oxide Sealed Defined Color Black S.H.I.S Upper ZS44 S.H.I.S Lower ZS56 S.H.I.S. Clamp Diameter 28.6 Cane Creek 40-Series ZS - Zero Stack Headset Headsets UPC: 840226077291

by Cane Creek

—$9.99

Available in the most common sizes and thicknesses-in small or bulk quantities, Problem Solvers headset spacers help riders get their stack height just right. Assorted Kit includes: 3mm (1), 5mm (1), and 10mm (3) thicknesses 1-1/8" Diameter Made from Aluminum, anodized or polished finish, without logos Item Specifications Color Black Defined Color Black Material Aluminum S.H.I.S. Stem Clamp Diameter 28.6 Thickness 10 Thickness 3 Thickness 5 Problem Solvers Headset Spacers Headset Stack Spacer UPC: 708752279605

by Problem Solvers

—$12.99

Cane Creek Crown Races Compatible across 10, 40 and 110 Series headsets and backwards compatible with S and XX Series All crown races feature integral molded seals Cane Creek Crown Races Crown Race UPC: 840226076959

by Cane Creek

—$29.99

40-Series BearingCompatible with 110-, 40-, and 10-Series headsets Item Specifications Bearing I.D. (mm) 41 Bearing O.D. (mm) 52 Bearing Type Cartridge Cartridge Bearing Angle 36x45 Thickness 6.5 Cane Creek 40-Series Headset Bearing UPC: 840226078441

by Cane Creek

—$63.99

The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Integrated bearings fit directly into compatible head tubes without the need of a bearing press. Compatible with tapered 1-1/8" to 1-1/2" steerer tubes, or straight 1-1/8" steerers with a conversion crown race (sold separately) Sealed black oxide bearings Carbon-friendy compression ring captured in top cover, keeping shims in place Steel crown race with integrated seals Interlok spacer compatible Uses 36/45 degree crown race and compression ring Item Specifications Bearing Type Cartridge Color Black Crown Race 40 Defined Color Black Lower Stack Height 1 S.H.I.S Lower IS52 S.H.I.S Upper IS41 S.H.I.S. Stem Clamp Diameter 28.6 Threadless Upper Stack Height 9 Cane Creek 40-Series IS - Integrated Headset Headsets UPC: 840226077666

by Cane Creek

—$12.99

Crown races for Cane Creek headsets fit a variety of lowers and crown race seat diameters. Compatible with 52mm lower headset bearings Compatible with 40mm (1-1/2") tapered steerer tubes Durable steel construction Compatible with 10-, 40- and 110-Series headsets and backwards compatible with S and XX Series Integral mold seals keep out the elements Item Specifications Crown Race 40 Cane Creek Crown Races Crown Race UPC: 840226076690

by Cane Creek

—$63.99

The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Integrated bearings fit directly into compatible head tubes without the need of a bearing press. Compatible with tapered 1-1/8" to 1-1/2" steerer tubes, or straight 1-1/8" steerers with a conversion crown race (sold separately) Sealed black oxide bearings Carbon-friendy compression ring captured in top cover, keeping shims in place Steel crown race with integrated seals Interlok spacer compatible Uses 36/45 degree crown race and compression ring Item Specifications Bearing Type Cartridge Color Black Crown Race 40 Defined Color Black Lower Stack Height 1 S.H.I.S Lower IS52 S.H.I.S Upper IS42 S.H.I.S. Stem Clamp Diameter 28.6 Threadless Upper Stack Height 9 Cane Creek 40-Series IS - Integrated Headset Headsets UPC: 840226077710

by Cane Creek

—$17.95

Add some color and style to your bike build with Precision Headset Stack spacers. Offered in multiple sizes, made proudly in Minneapolis, MN, and laser marked with the stack size on each end, find your perfect fit. Designed and manufactured in the Minneapolis, MN USA Fits 1 1/8"" steerers only Made from 6061-T6 Aluminum Item Specifications Color Black Defined Color Black Material Aluminum S.H.I.S. Stem Clamp Diameter 28.6 Thickness 10 Thickness 3 Thickness 5 Wolf Tooth Precision Spacer Kit Headset Stack Spacer UPC: 812719022507

by Wolf Tooth

—$15.99

Cane Creek Headset Top Sub AssembliesStack height =8mm Cane Creek Top Covers Headset Small Part UPC: 840226077598

by Cane Creek

—$12.99

Crown races for Cane Creek headsets fit a variety of lowers and crown race seat diameters. Compatible with 52mm lower headset bearings Compatible with 30mm (1-1/8") straight steerer tubes Durable steel construction Allows the installation of a straight steerer fork without changing out the headset lower 36x45 Compatible with 10-, 40- and 110-Series headsets and backwards compatible with S and XX Series Integral mold seals keep out the elements Cane Creek Crown Races Crown Race UPC: 840226076676

by Cane Creek

—$17.99

40-Series BearingCompatible with 110-, 40-, and 10-Series headsets Item Specifications Bearing I.D. (mm) 40.1 Bearing O.D. (mm) 52 Bearing Type Cartridge Cartridge Bearing Angle 36x45 Thickness 6.5 Cane Creek 40-Series Headset Bearing UPC: 840226078328

by Cane Creek

—$26.50

ENVE Composites Compression PlugsCarbon top cap Item Specifications Color Black ENVE Composites Compression Plugs Compression Plug UPC: 851705006046

by ENVE Composites

—$116.99

Cane Creek headsets with Hellbender stainless steel bearings with increased sealing elements and more grease in relation to the comparable 110 bearing.Designed to bridge the gap between the 40-series and 110-series headsets Item Specifications Bearing Type Cartridge Color Black Crown Race 40 S.H.I.S Lower ZS56 S.H.I.S Upper ZS44 S.H.I.S. Stem Clamp Diameter 28.6 Threadless Cane Creek Hellbender Headset Headsets UPC: 840226078533

by Cane Creek

—$29.99

Hellbender bearings have an improved seal structure and are cross compatible with Cane Creek headsets. Item Specifications Bearing I.D. (mm) 30.3 Bearing O.D. (mm) 41 Bearing Type Cartridge Cartridge Bearing Angle 36x45 Thickness 6.5 Cane Creek Hellbender Headset Bearing Headset Bearing UPC: 840226078137

by Cane Creek

—$52.99

Hellbender bearings have an improved seal structure and are cross compatible with Cane Creek headsets. Item Specifications Bearing I.D. (mm) 40.1 Bearing O.D. (mm) 52 Bearing Type Cartridge Cartridge Bearing Angle 36x45 Thickness 6.5 Cane Creek Hellbender Headset Bearing Headset Bearing UPC: 840226078144

by Cane Creek

—$13.99

Interlok spacers are available in 5mm and 10mm sizes in colors to match 110-Series headsets. Item Specifications Color Black Unit of Sale Each Material Aluminum Thickness 10mm S.H.I.S. Clamp Diameter 28.6 Cane Creek 110-Series Alloy Interlok Headset Stack Spacer UPC: 840226090559

by Cane Creek

—$143.99

Backed by a 110-year warranty and constructed in Fletcher, NC, the 110-Series headset is designed with no compromises in quality, durability, or finish quality. Integrated bearings fit directly into compatible head tubes without the need of a bearing press. Compatible with tapered 1-1/8" to 1-1/2" steerer tubes, or straight 1-1/8" steerers with a conversion crown race (sold separately) Sealed stainless steel bearings Carbon-friendy compression ring captured in top cover, keeping shims in place 7075 T-6 aluminum cups machined in Fletcher, NC Aluminum dual seal crown race protects lower bearing Interlok spacer compatible 110 year warrranty Uses 36/45 degree crown race and compression ring Item Specifications Bearing Type Cartridge Color Black Crown Race 40 Defined Color Black Lower Stack Height 1 S.H.I.S Lower IS52 S.H.I.S Upper IS41 S.H.I.S. Stem Clamp Diameter 28.6 Threadless Upper Stack Height 9 Cane Creek 110-Series IS - Integrated Headset Headsets UPC: 840226077703

by Cane Creek

—$84.99

Cane Creek 40-Series. The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Item Specifications Color Black Weight 171g Material AL-6061 Crown Race 39.7 Stack Height 20mm Bearing Type Black Oxide Sealed Defined Color Black S.H.I.S Upper ZS44 S.H.I.S Lower EC44 S.H.I.S. Clamp Diameter 28.6 Cane Creek 40-Series ZS - Zero Stack Headset Headsets UPC: 840226116600

by Cane Creek

—$9.99

Available in the most common sizes and thicknesses-in small or bulk quantities, Problem Solvers headset spacers help riders get their stack height just right. Assorted Kit includes: 3mm (1), 5mm (1), and 10mm (3) thicknesses 1" Diameter Made from Aluminum, anodized or polished finish, without logos Item Specifications Color Black Defined Color Black Material Aluminum S.H.I.S. Stem Clamp Diameter 25.4 Thickness 10 Thickness 3 Thickness 5 Problem Solvers Headset Spacers Headset Stack Spacer UPC: 708752279643

by Problem Solvers

—$34.95

Made in the USA, BlingKits add a dash of style and color to any bike in an easy to manage package. Includes a 3mm, 5mm,10mm,15mm headset spacer and integrated 5mm top cap Includes 2x sets of anodized to match bottle cage bolts Item Specifications Color Blue Defined Color Blue Thickness 10 Thickness 15 Thickness 3 Thickness 5 Wolf Tooth BlingKit Headset Stack Spacer UPC: 812719025089

by Wolf Tooth

—$43.99

Cane Creek 40-Series EC(External Cups) assemblies feature press-in cups with bearings outside the frame. The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Item Specifications Color Black Weight 65g Material AL-6061 Crown Race 39.7 Stack Height 12mm Bearing Type Black Oxide Sealed S.H.I.S Lower EC44 Cane Creek 40-Series EC - External Cup Headset Headset Lower UPC: 840226094816

by Cane Creek

—$34.95

Made in the USA, BlingKits add a dash of style and color to any bike in an easy to manage package. Includes a 3mm, 5mm,10mm,15mm headset spacer and integrated 5mm top cap Includes 2x sets of anodized to match bottle cage bolts Item Specifications Color Black Defined Color Black Thickness 10 Thickness 15 Thickness 3 Thickness 5 Wolf Tooth BlingKit Headset Stack Spacer UPC: 812719025102

by Wolf Tooth

—$11.99

Interlok spacers are available in 5mm and 10mm sizes in colors to match 110-Series headsets. Item Specifications Color Black Unit of Sale Each Material Aluminum Thickness 5mm S.H.I.S. Clamp Diameter 28.6 Cane Creek 110-Series Alloy Interlok Headset Stack Spacer UPC: 840226090580

by Cane Creek

—$34.95

Made in the USA, BlingKits add a dash of style and color to any bike in an easy to manage package. Includes a 3mm, 5mm,10mm,15mm headset spacer and integrated 5mm top cap Includes 2x sets of anodized to match bottle cage bolts Item Specifications Color Orange Defined Color Orange Thickness 10 Thickness 15 Thickness 3 Thickness 5 Wolf Tooth BlingKit Headset Stack Spacer UPC: 812719025126

by Wolf Tooth

—$37.50

The Chris King Base Plates (Crown Races) DOES NOT work for DropSet series headsets 44.0mm OD base plate is for headsets produced prior to 4/1995 and have an F designation 40.5mm OD base plate is for headsets produced after 4/1995 and have a B designation Chris King Base Plates (Crown Races) Crown Race UPC: 841529031508

by Chris King

—$78.99

Cane Creek 40 Tapered Headsets, Complete Item Specifications Color Black Weight 155g Material AL-6061 Crown Race 39.7 Stack Height 20mm Bearing Type Black Oxide Sealed Defined Color Black S.H.I.S Upper ZS44 S.H.I.S Lower EC49 S.H.I.S. Clamp Diameter 28.6 Cane Creek 40-Series ZS - Zero Stack Headset Headsets UPC: 840226077048

by Cane Creek

—$23

Whisky's top cap compression plugs are reliable and easy to use. Compatible with most aluminum and carbon 1-1/8" steerer tubes and serve as a direct replacement on Whisky forks. The simple design sheds weight, simplifies installation and offers great support and function. Single-tool set up and adjustment Internal compression easily applies pressure to secure headset during installation Direct replacement for Whisky forks with 1-1/8" steerer tube, and fits most other manufactures as well Item Specifications Color Black Whisky Parts Co. Top Cap Compression Plugs Compression Plug UPC: 708752268364

by Whisky Parts Co.

—$13.20

The No.7 Carbon headset stack spacers save weight and add style to any bike. 5-packs available in matte or gloss finish, with multiple sizes to choose from. 5-Pack of 5mm spacers Matte finish Full unidirectional carbon construction 5 year Whisky warranty Item Specifications Defined Color Black Whisky Parts Co. No.7 Carbon Headset Spacers 5-Pack Headset Stack Spacer UPC: 708752168084

by Whisky Parts Co.

—$18.99

Add some color and style to your bike build with Precision Headset Stack spacers. Offered in multiple sizes, made proudly in Minneapolis, MN, and laser marked with the stack size on each end, find your perfect fit. Designed and manufactured in the Minneapolis, MN USA Fits 1 1/8"" steerers only Made from 6061-T6 Aluminum Item Specifications Color Orange Defined Color Orange Material Aluminum S.H.I.S. Stem Clamp Diameter 28.6 Thickness 10 Thickness 15 Thickness 3 Thickness 5 Wolf Tooth Precision Spacer Kit Headset Stack Spacer UPC: 812719022576

by Wolf Tooth

—$34.95

Made in the USA, BlingKits add a dash of style and color to any bike in an easy to manage package. Includes a 3mm, 5mm,10mm,15mm headset spacer and integrated 5mm top cap Includes 2x sets of anodized to match bottle cage bolts Item Specifications Color Purple Defined Color Purple Thickness 10 Thickness 15 Thickness 3 Thickness 5 Wolf Tooth BlingKit Headset Stack Spacer UPC: 812719025096

by Wolf Tooth

—$175.99

Backed by a 110-year warranty and constructed in Fletcher, NC, the 110-Series headset is designed with no compromises in quality, durability, or finish quality. Zero stack uppers press into head tube with very little stack height. Lowers are either zero stack or external cup. Compatible with tapered 1-1/8" to 1-1/2" steerer tubes, or straight 1-1/8" steerers with a conversion crown race (sold separately) Sealed stainless steel bearings Carbon-friendy compression ring captured in top cover, keeping shims in place 7075 T-6 aluminum cups machined in Fletcher, NC Aluminum dual seal crown race protects lower bearing Interlok spacer compatible 110 year warrranty Item Specifications Bearing Type Cartridge Color Black Crown Race 40 Defined Color Black Lower Stack Height 4 S.H.I.S Lower ZS56 S.H.I.S Upper ZS44 S.H.I.S. Stem Clamp Diameter 28.6 Threadless Upper Stack Height 8 Cane Creek 110-Series ZS - Zero Stack Headset Headsets UPC: 840226077765

by Cane Creek

—$63.99

Cane Creek 40-Series. The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Item Specifications Color Black Weight 88g Material AL-6061 Crown Race 30.0 Stack Height 8mm Bearing Type Black Oxide Sealed Defined Color Black S.H.I.S Upper ZS44 S.H.I.S Lower ZS44 S.H.I.S. Clamp Diameter 28.6 Cane Creek 40-Series ZS - Zero Stack Headset Headsets UPC: 840226094861

by Cane Creek

—$39.99

Cane Creek 40-Series ZS(Zero Stack) assemblies feature press-in cups with bearings inside the frame. The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Item Specifications Color Black Weight 44g Material AL-6061 Stack Height 8mm Bearing Type Black Oxide Sealed S.H.I.S Upper ZS44 S.H.I.S. Clamp Diameter 28.6 Cane Creek 40 ZS Headset Headset Upper UPC: 840226094977

by Cane Creek

—$12.50

40-Series BearingCompatible with 110-, 40-, and 10-Series headsets Item Specifications Bearing I.D. (mm) 30.3 Bearing O.D. (mm) 41 Bearing Type Cartridge Cartridge Bearing Angle 36x45 Thickness 6.5 Cane Creek 40-Series Headset Bearing UPC: 840226078304

by Cane Creek

—$9.99

Available in the most common sizes and thicknesses-in small or bulk quantities, Problem Solvers headset spacers help riders get their stack height just right. Assorted Kit includes: 3mm (1), 5mm (1), and 10mm (3) thicknesses 1-1/8" Diameter Made from Aluminum, anodized or polished finish, without logos Item Specifications Color Silver Defined Color Silver Material Aluminum S.H.I.S. Stem Clamp Diameter 28.6 Thickness 10 Thickness 3 Thickness 5 Problem Solvers Headset Spacers Headset Stack Spacer UPC: 708752279629

by Problem Solvers

—$84.99

Cane Creek 40-Series. The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Item Specifications Color Black Weight 171g Material AL-6061 Crown Race 30.0 Stack Height 20mm Bearing Type Black Oxide Sealed Defined Color Black S.H.I.S Upper ZS44 S.H.I.S Lower EC44 S.H.I.S. Clamp Diameter 28.6 Cane Creek 40-Series ZS - Zero Stack Headset Headsets UPC: 840226077574

by Cane Creek

—$34.95

Made in the USA, BlingKits add a dash of style and color to any bike in an easy to manage package. Includes a 3mm, 5mm,10mm,15mm headset spacer and integrated 5mm top cap Includes 2x sets of anodized to match bottle cage bolts Item Specifications Color Gold Defined Color Gold Thickness 10 Thickness 15 Thickness 3 Thickness 5 Wolf Tooth BlingKit Headset Stack Spacer UPC: 812719026185

by Wolf Tooth

—$34.95

Made in the USA, BlingKits add a dash of style and color to any bike in an easy to manage package. Includes a 3mm, 5mm,10mm,15mm headset spacer and integrated 5mm top cap Includes 2x sets of anodized to match bottle cage bolts Item Specifications Color Red Defined Color Red Thickness 10 Thickness 15 Thickness 3 Thickness 5 Wolf Tooth BlingKit Headset Stack Spacer UPC: 812719025072

by Wolf Tooth

—$19.13

Add some color and style to your bike build with Precision Headset Stack spacers. Offered in multiple sizes, made proudly in Minneapolis, MN, and laser marked with the stack size on each end, find your perfect fit. Designed and manufactured in the Minneapolis, MN USA Fits 1 1/8"" steerers only Made from 6061-T6 Aluminum Item Specifications Color Blue Defined Color Blue Material Aluminum S.H.I.S. Stem Clamp Diameter 28.6 Thickness 10 Thickness 15 Thickness 3 Thickness 5 Wolf Tooth Precision Spacer Kit Headset Stack Spacer UPC: 812719022521

by Wolf Tooth

—$30.99

Cane Creek 40 IS Bottom Assemblies Consistent stack heights across 10, 40 and 110 Series Internal parts are cross-compatible across 10, 40 and 110 series Durable steel crown race with low-friction face-seals Item Specifications Color Black Weight 50g Material AL-6061 Crown Race 39.7 Stack Height 1mm Bearing Type Black Oxide Sealed S.H.I.S Lower IS52 Cane Creek 40-Series IS - Integrated Headset Headset Lower UPC: 840226095219

by Cane Creek

—$99.99

Cane Creek headsets with Hellbender stainless steel bearings with increased sealing elements and more grease in relation to the comparable 110 bearing.Designed to bridge the gap between the 40-series and 110-series headsets Item Specifications Bearing Type Cartridge Color Black Crown Race 40 S.H.I.S Lower IS52 S.H.I.S Upper IS41 S.H.I.S. Stem Clamp Diameter 28.6 Threadless Cane Creek Hellbender Headset Headsets UPC: 840226078557

by Cane Creek

—$23

The No.7 Carbon headset stack spacers save weight and add style to any bike. 5-packs available in matte or gloss finish, with multiple sizes to choose from. 5-Pack of 10mm spacers Matte finish Full unidirectional carbon construction 5 year Whisky warranty Item Specifications Defined Color Black Whisky Parts Co. No.7 Carbon Headset Spacers 5-Pack Headset Stack Spacer UPC: 708752168060

by Whisky Parts Co.

—$44.99

Cane Creek 40-Series ZS(Zero Stack) assemblies feature press-in cups with bearings inside the frame. The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Item Specifications Color Black Weight 65g Material AL-6061 Crown Race 39.7 Stack Height 4mm Bearing Type Black Oxide Sealed S.H.I.S Lower ZS56 Cane Creek 40-Series ZS - Zero Stack Headset Headset Lower UPC: 840226095011

by Cane Creek

—$35

The Chris King Base Plates (Crown Races) 44.0mm OD base plate is for headsets produced prior to 4/1995 and have an F designation 40.5mm OD base plate is for headsets produced after 4/1995 and have a B designation Headset marked "B" Chris King Base Plates (Crown Races) Crown Race UPC: 841529023053

by Chris King

—$44.99

Cane Creek 40-Series ZS(Zero Stack) assemblies feature press-in cups with bearings inside the frame. The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Item Specifications Color Black Weight 88g Material AL-6061 Crown Race 30.0 Stack Height 4mm Bearing Type Black Oxide Sealed S.H.I.S Lower ZS56 Cane Creek 40-Series ZS - Zero Stack Headset Headset Lower UPC: 840226095004

by Cane Creek

—$63.99

Cane Creek 40-Series EC(External Cups) assemblies feature press-in cups with bearings outside the frame. The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Replaces Cane Creek S-3 headset External Cup (EC) assemblies feature press-in cups with bearings outside the frame Item Specifications Color Black Weight 98g Material AL-6061 Crown Race 30.0 Stack Height 28mm Bearing Type Black Oxide Sealed Defined Color Black S.H.I.S Upper EC34 S.H.I.S Lower EC34 S.H.I.S. Clamp Diameter 28.6 Cane Creek 40-Series EC - External Cup Headset Headsets UPC: 840226094755

by Cane Creek

—$21.99

40-Series BearingCompatible with 110-, 40-, and 10-Series headsets Item Specifications Bearing I.D. (mm) 40.15 Bearing O.D. (mm) 52 Bearing Type Cartridge Cartridge Bearing Angle 45x45 Thickness 7 Cane Creek 40-Series Headset Bearing UPC: 840226078380

by Cane Creek

—$99.99

Cane Creek headsets with Hellbender stainless steel bearings with increased sealing elements and more grease in relation to the comparable 110 bearing.Designed to bridge the gap between the 40-series and 110-series headsets Item Specifications Bearing Type Cartridge Color Black Crown Race 40 S.H.I.S Lower IS52 S.H.I.S Upper IS42 S.H.I.S. Stem Clamp Diameter 28.6 Threadless Cane Creek Hellbender Headset Headsets UPC: 840226078564

by Cane Creek

—$6

Compression ring fits above the upper bearing in a Cane Creek headset to ensure vertical and horizontal compression is optimal.Compatible with 41mm and 42mm OD upper bearings Cane Creek Compression Ring Headset Small Part UPC: 840226093352

by Cane Creek