CeramicSpeed Headset Compatibility

Headset SHIS

Single Headset Bearings

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Fork Steerer   SHIS If upper SHIS If lower Common drop in fitment 
HS bearing 1" 27,15x38x6,5mm, 36/45 degrees IS38/25.4 IS38/26 Specialized
HS bearing 1-1/8" 30,5x41,8x8mm, 45/45 degrees IS42/28.6 IS42/30 Specialized, Pinarello
HS bearing 1-1/4" 34,1x46,9x7mm, 45/45 degrees IS47/31.8 IS47/33 Specialized
HS bearing 1-3/8" 37x49x7mm, 45/45 degrees  - IS49/37(45) Specialized
HS bearing 1-1/2" 40x52x7mm, 45/45 degrees IS52/38.1 IS52/40(45) Specialized, Pinarello
HS bearing 1-1/8" 30,15x41x7mm, 45/45 degrees IS41/28.6 IS41/30(45) Cervelo Upper
HS bearing 1-1/8" 30,15x41x7mm, 36/45 degrees IS41/28.6 IS41/30(36) Cervelo Lower
HS bearing 1-3/8" 37x48,9x6,5mm, 36/45 degrees  - IS49/37(36) Cervelo / Factor
HS bearing 1-1/2" 40x51,8x8mm, 36/45 degrees IS52/38.1 IS52/40(36) Cervelo
HS bearing 1-1/4" 34,1x46x7mm, 45/45 degrees IS46/31.8 IS46/33 Scott
HS bearing 1-1/2" 40x51,9x8mm, 45/45 degrees IS52/38.1 IS52/40(45) Scott
HS bearing 1-1/8" 30,15x41x6,5, 36/45 degrees IS41/28.6 IS41/30(36) Scott / Factor
HS bearing 1-1/8" 30,2x41,8x6,3mm 45/45 degrees IS42/28.6 IS42/30 Cannondale
HS bearing 1-1/2" 40x51x6,5mm 36/36 degrees IS51/38.1 IS51/40(36) Trek

Complete Headset Kits

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Name / Designation Compatible with Fork Steerer SHIS (upper, space, lower) Bearings included 
Specialized HS 1 Shiv TT (UCI Legal, used on WT teams) Upper: 1" Lower: 1-1/8"  IS38/25.4 IS42/30 101523 + 101533
Specialized HS 2 Tarmac SL5 size 49-52 Upper: 1-1/8" Lower: 1-1/4" IS42/28.6 IS47/33 101533 + 101529
Specialized HS 3 Tarmac SL5 size 54-56 & Venge Upper: 1-1/8" Lower: 1-3/8" IS42/28.6 IS49/37(45) 101533 + 101540
Specialized HS 4 Tarmac SL5 size 58+ & SL6 all sizes Upper: 1-1/8" Lower: 1-1/2" IS42/28.6 IS52/40 101533 + 101525
Specialized HS 5 Shiv Tri (not UCI legal, used in triathlon) Upper: 1-1/8" Lower: 1-1/8" IS42/28.6 IS42/30 2x 101533
Cervelo HS 1 2017 & older R-series + 2018 & older S-series Upper: 1-1/8" Lower: 1-3/8" IS41/28.6 IS49/37(36) 101536 + 101542
Cervelo HS 2 2018 & older P-series Upper: 1-1/8" Lower: 1-1/8" IS41/28.6 IS41/30(36) 101536 + 101538
Cervelo HS 3 2018 & newer R-series, C-series, P5X, & P3X  Upper: 1-1/8" Lower 1-1/2" IS41/28.6 IS52/40 101536 + 103285
Cervelo HS 4 P5 Disc & S5 Disc  Upper: 1" Lower: 1-3/8"  IS38/25.4 IS49/37(36) 101523 + 101542
Cervelo HS 5 2019 & newer S3 Disc & S3 Rim Upper: 1-1/4" Lower: 1-3/8" IS47/31.8 IS49/37(36) 101529 + 101542
Scott HS 1 Addict/Solace Upper: 1-1/8" Lower: 1-1/4" IS41/28.6 IS46/33 101536 + 101531
Scott HS 2 Foil Upper: 1-1/4" Lower: 1-1/2" IS46/31.8 IS52/40 101531 + 101527
Scott HS 3 Plasma Upper: 1-1/8" Lower: 1-1/8" IS41/28.6 IS41/30(36) 2x 103284
Pinarello HS 1 F8/F10 no split ring included  Upper: 1-1/8" Lower: 1-1/2" IS41/28.6 IS52/40 101533 + 101525
Outboard HS 44mm straight headtube Upper: 1-1/8" Lower: 1-1/4" ZS44/28.6 EC44/33 101536 + 101531
Outboard HS 34mm traditional straight headtube  Upper: 1-1/8" Lower: 1-1/8" EC34/28.6 EC34/30 2x 101536
Outboard HS 44mm straight headtube Upper: 1-1/8" Lower: 1-1/2" ZS44/28.6 EC44/40 101536 + 101525
Outboard HS 34mm/44mm tapered headtube Upper: 1-1/8" Lower: 1-1/4" EC34/28.6 EC44/33 101536 + 101531