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ISO One Inch Threaded Headsets

This is the size used on most high quality bicycles manufactured before the late 1990s. See also Sheldon Brown's Headset Crib Sheet ISO Standard Dimensions:
Cup outside diameter	Crown race inside diameter	Thread size	Stem diameter
30.2 mm	26.4	1" x 24 tpi	7/8" / 22.2 mm

Cane Creek Classic 110 HD2364 $139.95  

Cane Creek pulled out all the stops when they made this stunning 1" threaded headset!

One cool feature of this headset is a washer with a small set screw that replaces the traditional keyed washer used in between the top nut and the locknut. The set screw can be adjusted to lock in to the slot on most threaded steerer tubes. 1.5mm allen wrench included.

Split-Lip sealed bearings are drop-in fit for easy servicing

AL-6066 is 35% stronger than AL-6061 typically used for headset cups

Fits 1" threaded steerer tubes.

Crown race: 26.4mm

Stack height: 39mm

Polished silver

Made in USA

Shimano 105 HP-5500 HD8456 $54.95  

NOS!

Shimano's 105 Headset ensures smooth steering. It utilizes beefy cartridge bearings and anodized-aluminum cups to create a headset that's durable, light and affordable.

Color: Silver

Crown Race: 26.4mm

Stack Height: 37.5 mm

Weight: 106.0 g

Velo Orange Grand Cru HD1264 $40.95  

Very nice quality 1" threaded headset.

Over-sized sealed bearings

Alloy construction

The fork crown race is split so it slides on without tools

42mm stack height

26.4 (ISO) crown race

New! Origin8 Pro HD1280 $29.95  

Excellent value in an alloy headset with sealed cartridge bearings.

CNC machined 6061-T6 aluminum alloy cups. Silver.

Comes with both 26.4mm and 27.0mm crown races.

Cup Diameter: 30.2mm

Stack Height: 42.5mm

Weight: 110 grams

Tange MA-60 ISO $12.95

A decent economy-grade headset.

Stack height: 31.2 mm

Weight: 160 grams

Tange Levin ISO HD1001 $24.95

Excellent value in a steel headset, using 5/32" ball bearings.

Stack height: 33.4 mm Weight: 149 grams

Click on the link for your size:

For Threaded Steerers
1 inch ISO	1 inch J.I.S.	1 inch B.M.X.	1 1/8 inch Threaded	1 1/4 inch Threaded	French thread
Road bikes older mtbs	Old Japanese size	BMX, Cruisers Old MTBs	Newer mtbs	Rare	Older French bicycles

For Threadless Steerers ("Aheadset," et. al.)
1 inch Threadless	1 1/8 inch Threadless	1 1/4 inch Threadless
Some mtbs	Most Newer mtbs	Newer mtbs

See also Sheldon Brown's Headset Crib Sheet

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