CeramicSpeed BB ALPHA Bottom Bracket - PF30 73mm For SRAM DUB Spindle MTB BLK MFPN=09-001250 The AR40 is designed for

The AR40 is designed for use with only tubeless tires greater than 28 mm wide Rim Width (Internal) 25 Front Axle 12mm Thru x 100mm Valve Presta Color Black Wheel Size 700c Defined Color Black ISO Diameter 622 / Road / 29" Tire Type Tubeless Ready Rim Material Carbon Hub/Brake Compatibility Center-Lock Disc

Why have extra steerer tube requiring spacers on top of your stem you ask

Fits 2 pairs of skis & poles (depends on ski style) Skate wheels (smooth & silent rolling

Headlight mount easily on different diameters and shapes with wildly adjustable silicone strap

Material Aluminum Gauge 14g Length 16mm Color Black Package 100/Count Size 14G/16Mm

CeramicSpeed BB ALPHA Bottom Bracket - PF30 73mm For SRAM DUB Spindle MTB BLK MFPN=09-001250 The AR40 is designed forA bottom bracket built to outlast your frame BB ALPHA features hardened stainless steel races hand built with grade 3 Silicon Nitride ceramic balls custom engineered seals and precision dust covers delivering up to 500% better moisture protection while still providing ultra low friction performance. The simplified spacer tube design and lighter 7075 aluminum cups ensure quick installation and a 10% weight reduction over previous generations. All