Vintage Shimano 105 SC HP-1055 1 Inch Threaded Headset NOS JIS 30.4mm Road Bike

Vintage Shimano 105 SC HP-1055 1 inch threaded headset for road, racing, touring, or track bicycles using JIS-standard forks.

Grey anodized aluminum upper and lower cups with white SHIMANO 105 logos, steel crown race and locknut, and black sealing rings for a sealed mechanism with burnished bearing races.

Box text: SHIMANO 105 SC HEAD PARTS, Sealed Mechanism, Burnished Bearing Races, MODEL HP-1055, HP-1055 SET JIS, 2-7810100067.

Material and construction: aluminum cups and top hardware with steel bearing races and small parts, designed for a 1 inch threaded steerer and approximately 30.4 mm JIS head tube inner diameter.

Actual Measurements (digital caliper readings in photos): crown race seat diameter 26.95 mm, head tube cup outer diameter 30.14 mm.

Weight: 140 g (digital scale reading in photos). Only the Shimano 105 SC HP-1055 headset with cups, races, seals, washers, blue grease container, and original box shown in the photos are included.

New old stock Shimano 105 SC HP-1055 headset with original box and blue grease container. Components show clean threads, bearing surfaces, and logos with no clamp or installation marks; grey anodized cups have tiny handling marks from storage but no gouges, dents, or corrosion. Cardboard box has edge and corner wear, creases, tape and inventory stickers, and light surface scuffs from long-term storage. Listing includes the complete headset with cups, races, bearings, washers, blue grease container, and original box only; calipers, scale, plastic bags, and any other background items visible in the photos are not included. Open box - Only the parts shown in the pictures are included.