Shimano BB-UN300 Bottom Bracket - English | 68 x 110mm Spindle - Square Taper JIS
What Does the Shimano BB-UN300 Offer in 68 x 110mm?
The Shimano BB-UN300 is a square taper cartridge bottom bracket built for long service life and consistent performance on a wide range of bikes and riding conditions. The 68 x 110mm version fits English thread bottom bracket shells on road bikes, hybrids, and some mountain bikes that run JIS square taper cranksets with shorter spindle requirements. The sealed cartridge bearing design keeps dirt and moisture out of the bearings without requiring regular greasing, extending service intervals significantly compared to older cup-and-cone designs.
The hollow spindle reduces weight while retaining the structural rigidity needed for efficient power transfer from crank to chain. The BB-UN300 is the standard replacement for square taper bottom brackets across the Shimano lineup, compatible with Tourney, Altus, Acera, Sora, and older Tiagra cranksets using JIS taper geometry. Installation uses a standard Shimano bottom bracket tool and follows English thread convention with the left cup reverse-threaded. Crankarm fixing bolts are sold separately.
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Shimano BB-UN300 Bottom Bracket - English | 68 x 110mm Spindle - Square Taper JIS
Shimano BB-UN300 Bottom Bracket - English | 68 x 110mm Spindle - Square Taper JIS
What Does the Shimano BB-UN300 Offer in 68 x 110mm?
The Shimano BB-UN300 is a square taper cartridge bottom bracket built for long service life and consistent performance on a wide range of bikes and riding conditions. The 68 x 110mm version fits English thread bottom bracket shells on road bikes, hybrids, and some mountain bikes that run JIS square taper cranksets with shorter spindle requirements. The sealed cartridge bearing design keeps dirt and moisture out of the bearings without requiring regular greasing, extending service intervals significantly compared to older cup-and-cone designs.
The hollow spindle reduces weight while retaining the structural rigidity needed for efficient power transfer from crank to chain. The BB-UN300 is the standard replacement for square taper bottom brackets across the Shimano lineup, compatible with Tourney, Altus, Acera, Sora, and older Tiagra cranksets using JIS taper geometry. Installation uses a standard Shimano bottom bracket tool and follows English thread convention with the left cup reverse-threaded. 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 110mm?
The Shimano BB-UN300 is a square taper cartridge bottom bracket built for long service life and consistent performance on a wide range of bikes and riding conditions. The 68 x 110mm version fits English thread bottom bracket shells on road bikes, hybrids, and some mountain bikes that run JIS square taper cranksets with shorter spindle requirements. The sealed cartridge bearing design keeps dirt and moisture out of the bearings without requiring regular greasing, extending service intervals significantly compared to older cup-and-cone designs.
The hollow spindle reduces weight while retaining the structural rigidity needed for efficient power transfer from crank to chain. The BB-UN300 is the standard replacement for square taper bottom brackets across the Shimano lineup, compatible with Tourney, Altus, Acera, Sora, and older Tiagra cranksets using JIS taper geometry. Installation uses a standard Shimano bottom bracket tool and follows English thread convention with the left cup reverse-threaded. Crankarm fixing bolts are sold separately.
