Shimano MTB Double Bottom Bracket, BB-UN300, Spindle: Square Type, Shell: BSA 68MM, Spindle: 122.5MM (LL123), W/O Fixing Bolt | bottom-bike-brackets-and-accessories
Product details
| Management number | 247488318 | Release Date | 2026/08/16 | List Price | US$8.00 | Model Number | 247488318 | ||
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Upgrade your bicycle's performance with the BB-UN300 Square Taper JIS Bottom Bracket, a reliable and durable choice for classic and modern JIS cranksets. Designed with precision engineering and materials, this bottom bracket ensures smooth power transfer and long-lasting performance on every ride. Materials & Construction Constructed with a hollow spindle crafted from lightweight yet robust alloy, the BB-UN300 enhances pedal efficiency while reducing weight. Its durable black finish provides corrosion resistance, ensuring reliability in diverse riding conditions. Performance & Engineering Engineered for optimal performance, this BSA bottom bracket features a 68mm shell width and a 50mm chainline, delivering precise alignment for improved power transfer from the crankset to the drivetrain. The hollow spindle design reduces weight without compromising strength, enabling a smoother pedaling experience. Components & Technology Compatible exclusively with JIS square-taper cranksets, the BB-UN300 offers a seamless fit with crankarm fixing bolts sold separately. Its high-precision bearing interface guarantees smooth rotation and durability, making it suitable for daily commuting, touring, and recreational cycling. Style & Use Case With a classic black finish and standard BSA shell interface, this bottom bracket complements a wide range of bicycle styles including road bikes, city commuter bikes, and touring rigs. Its robust design and straightforward installation make it an ideal choice for both bike enthusiasts and daily riders seeking reliability and consistency. Key Features & Benefits: - 50mm chainline for balanced power distribution - Fits JIS square-taper cranksets with 68mm shell width - Lightweight hollow spindle for efficient pedaling - Durable black anodized finish for corrosion resistance - Precise engineering for smooth rotation and long-term performance Upgrade your bike today with the BB-UN300 Square Taper BSA Bot
- Fits JIS square-taper cranksets
- Crankarm fixing bolts sold separately
- Hollow spindle
- 50mm chainline
| UPC | 192790619255 |
|---|---|
| ASIN | B08DJCDFS6 |
| Model | EBBUN300B23X |
| Brand Name | SHIMANO |
| Unit Count | 1 Count |
| Item Length | 9 inches |
| Item Weight | 300 g |
| Part Number | EBBUN300B23X |
| Manufacturer | Shimano |
| Material Type | Steel Bearings |
| Item Dimensions | 9 x 4.5 x 4 inches |
| Number of Items | 1 |
| Specification Met | Jis Square-taper and English Interface Compatibility |
| Included Components | Bottom Brackets |
| Warranty Description | Limited Warranty |
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