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ACS Maindrive Headset, EC30/25.4|EC30/26 Blue
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BuyPART NUM 503391
Forged steel cups, alloy tops, and cap with sealed mechanism bearings Available for 1" (25.4mm) or 1-1/8" (28.6mm) EC (traditional cup) applications … read more
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5 of 5 stars
( 1 review )
ACS 63827-2000your price $19.99
BuyPART NUM 503391 
ACS Maindrive Headset, EC34/28.6|EC34/30 Black BuyPART NUM 585164
Forged steel cups, alloy tops, and cap with sealed mechanism bearings Available for 1" (25.4mm) or 1-1/8" (28.6mm) EC (traditional cup) applications … read more
your price $24.95
BuyPART NUM 585164 
ACS Maindrive Headset, EC34/28.6|EC34/30 Red BuyPART NUM 937391
Forged steel cups, alloy tops, and cap with sealed mechanism bearings Available for 1" (25.4mm) or 1-1/8" (28.6mm) EC (traditional cup) applications … read more
your price $19.99
BuyPART NUM 937391 
ACS Maindrive, ACS IS38/25.4|IS38/26 Blue
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5 of 5 stars
( 1 review )
BuyPART NUM 401605
CNC machined alloy tops with sealed mechanism 45/45 degree bearings Available as 1" (25.4mm), 1-1/8"(28.6mm) and 1 1/8" to 1" reducer … read more
5 of 5
( 1 )
5 of 5 stars
( 1 review )
your price $19.99
BuyPART NUM 401605 
ACS Maindrive Headset, EC34/28.6|EC34/30 Blue BuyPART NUM 175953
Forged steel cups, alloy tops, and cap with sealed mechanism bearings Available for 1" (25.4mm) or 1-1/8" (28.6mm) EC (traditional cup) applications … read more
your price $19.99
BuyPART NUM 175953 
ACS Maindrive Headset, IS42/25.4 - IS42/26 Black
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5 of 5 stars
( 1 review )
BuyPART NUM 590612
CNC machined alloy tops with sealed mechanism 45/45 degree bearings Available as 1" (25.4mm), 1-1/8"(28.6mm) and 1 1/8" to 1" reducer … read more
5 of 5
( 1 )
5 of 5 stars
( 1 review )
your price $19.99
BuyPART NUM 590612 
ACS Maindrive Headset, EC30/25.4|EC30/26 Black BuyPART NUM 512751
Forged steel cups, alloy tops, and cap with sealed mechanism bearings Available for 1" (25.4mm) or 1-1/8" (28.6mm) EC (traditional cup) applications … read more
your price $24.95
BuyPART NUM 512751 
ACS Main Drive Headset - Integrated, 1-1/8", Red BuyPART NUM 542543
MainDrive Integrated Headsets feature CNC machined alloy tops with 45/45 degree sealed mechanism retainer bearings. Item Specifications S.H.I.S. Stem … read more
your price $24.95
BuyPART NUM 542543 
ACS Maindrive, IS42/28.6|IS42/30 Blue
5 of 5
( 1 )
5 of 5 stars
( 1 review )
BuyPART NUM 230524
CNC machined alloy tops with sealed mechanism 45/45 degree bearings Available as 1" (25.4mm), 1-1/8"(28.6mm) and 1 1/8" to 1" reducer … read more
5 of 5
( 1 )
5 of 5 stars
( 1 review )
your price $24.95
BuyPART NUM 230524 
ACS Maindrive, IS38/25.4|IS38/26 Red
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5 of 5 stars
( 1 review )
BuyPART NUM 732929
CNC machined alloy tops with sealed mechanism 45/45 degree bearings Available as 1" (25.4mm), 1-1/8"(28.6mm) and 1 1/8" to 1" reducer … read more
5 of 5
( 1 )
5 of 5 stars
( 1 review )
your price $19.99
BuyPART NUM 732929 We define color as the main color of the item. It may have accents or highlights in other colors.
These models are available for online purchasing and can be shipped directly to you.
S.H.I.S clamp diameter is the steerer tube diameter.
S.H.I.S Lower
S.H.I.S Upper
Crown Race
This is the part number or identifier for this item from the manufacturer
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