Shimano BB-UN300 Bottom Bracket - English | 68 x 113mm Spindle - Square Taper JIS
What Does the Shimano BB-UN300 Offer in 68 x 113mm?
The Shimano BB-UN300 in 68 x 113mm is the standard square taper bottom bracket for a wide range of mountain bike and hybrid builds where a longer spindle is needed to achieve correct chainline with wider cranksets and triple chainring setups. Built around a sealed cartridge bearing design, it keeps moisture and contamination away from the bearing surfaces without requiring periodic greasing, making it a low-maintenance solution for everyday and trail riding use. The JIS square taper interface is Shimano's long-established standard and ensures solid compatibility with Tourney, Altus, Acera, and older MTB cranksets.
The hollow spindle trims weight without sacrificing rigidity, and the sealed unit delivers consistent, creak-free pedaling performance across seasons and riding conditions. Installation follows standard English thread convention with a reverse-threaded left cup and requires a standard Shimano bottom bracket tool. The BB-UN300 is the go-to replacement for any worn or failed square taper bottom bracket on a Shimano-compatible drivetrain. Crankarm fixing bolts are sold separately.
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Shimano BB-UN300 Bottom Bracket - English | 68 x 113mm Spindle - Square Taper JIS
Shimano BB-UN300 Bottom Bracket - English | 68 x 113mm Spindle - Square Taper JIS
What Does the Shimano BB-UN300 Offer in 68 x 113mm?
The Shimano BB-UN300 in 68 x 113mm is the standard square taper bottom bracket for a wide range of mountain bike and hybrid builds where a longer spindle is needed to achieve correct chainline with wider cranksets and triple chainring setups. Built around a sealed cartridge bearing design, it keeps moisture and contamination away from the bearing surfaces without requiring periodic greasing, making it a low-maintenance solution for everyday and trail riding use. The JIS square taper interface is Shimano's long-established standard and ensures solid compatibility with Tourney, Altus, Acera, and older MTB cranksets.
The hollow spindle trims weight without sacrificing rigidity, and the sealed unit delivers consistent, creak-free pedaling performance across seasons and riding conditions. Installation follows standard English thread convention with a reverse-threaded left cup and requires a standard Shimano bottom bracket tool. The BB-UN300 is the go-to replacement for any worn or failed square taper bottom bracket on a Shimano-compatible drivetrain. Crankarm fixing bolts are sold separately.
Original: $16.99
-70%$16.99
$5.10Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
What Does the Shimano BB-UN300 Offer in 68 x 113mm?
The Shimano BB-UN300 in 68 x 113mm is the standard square taper bottom bracket for a wide range of mountain bike and hybrid builds where a longer spindle is needed to achieve correct chainline with wider cranksets and triple chainring setups. Built around a sealed cartridge bearing design, it keeps moisture and contamination away from the bearing surfaces without requiring periodic greasing, making it a low-maintenance solution for everyday and trail riding use. The JIS square taper interface is Shimano's long-established standard and ensures solid compatibility with Tourney, Altus, Acera, and older MTB cranksets.
The hollow spindle trims weight without sacrificing rigidity, and the sealed unit delivers consistent, creak-free pedaling performance across seasons and riding conditions. Installation follows standard English thread convention with a reverse-threaded left cup and requires a standard Shimano bottom bracket tool. The BB-UN300 is the go-to replacement for any worn or failed square taper bottom bracket on a Shimano-compatible drivetrain. Crankarm fixing bolts are sold separately.
