Cannondale HollowGram Si / SiSL2 MTB 137mm Crank Spindle – 73/83mm

Cannondale Factory Replacement HollowGram MTB Crank Spindle KP308 | 73mm / 83mm Mountain Bottom Brackets

This genuine Cannondale OEM crank spindle (KP308) is engineered for HollowGram SiSL2, HollowGram Si, and Cannondale Si mountain bike crank arms. Designed specifically for 73mm and 83mm MTB bottom bracket shells, it restores proper crank alignment, bearing preload, and drivetrain stiffness.

Manufactured to exact Cannondale factory specifications, this spindle ensures smooth rotation, long bearing life, and maximum power transfer on modern Cannondale mountain bike platforms.

Features & Benefits

• Genuine Cannondale OEM replacement part

• Compatible with:

  • HollowGram SiSL2 MTB crank arms

  • HollowGram Si MTB crank arms

  • Cannondale Si MTB crank arms

• Designed for 73mm & 83mm MTB bottom bracket shells

• Restores factory crank alignment and bearing interface

• Ideal for crank service, rebuilds, or replacements

Specifications

• Part Number: KP308

• Application: Mountain Bike (MTB)

• Bottom Bracket Shell Widths: 73mm / 83mm

• Crank Compatibility:

  • HollowGram SiSL2 (MTB)

  • HollowGram Si (MTB)

  • Cannondale Si (MTB)

• Material: Alloy

• Drivetrain Compatibility: 1x or 2x (frame dependent)

Included

• Cannondale HollowGram MTB crank spindle – KP308 (1 pc)

• Spacers not included

  • Spacer kit sold separately: Cannondale KP484

Compatibility Notes

• Designed exclusively for mountain bike HollowGram cranksets

• Compatible with 73mm and 83mm MTB frames

• Always confirm frame BB width before ordering

Installation Notes

• Professional installation recommended

• Correct spacer kit required for proper chainline

• Torque crank hardware per Cannondale specifications

Why Buy OEM Cannondale?

• Guaranteed factory fit and alignment

• Prevents premature bearing wear

• Maintains HollowGram stiffness and efficiency

• Preserves ride quality and resale value

A factory-correct spindle solution for Cannondale HollowGram MTB cranksets—built for strength, precision, and long-term reliability on the trail.