Shimano Ultegra Bottom Bracket (BB) (SM-BBR60)

描述

# SHIMANO ULTEGRA 五通（SM-BBR60）

**ULTEGRA 級牙紋式五通，Hollowtech II 系統專用。**

SHIMANO ULTEGRA SM-BBR60 屬 ULTEGRA 6800 系列，採用 Hollowtech II 技術，軸承外置設計提供更寬的支撐平台，提升剛性與踩踏效率。密封軸承設計減少阻力，官方數據顯示比前代 SM-BB6700 減少約 50% 摩擦，重量減輕約 14-15g。

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## 為何選擇 SM-BBR60？

– **Hollowtech II 技術**：軸承外置，負載分佈更佳，穩定性更高
– **低摩擦密封**：改良密封設計，比前代減少約 50% 旋轉阻力
– **輕量化**：約 77g，比 SM-BB6700 輕約 14-15g
– **小尺寸鋼珠軸承**：降低重量同時保持順暢旋轉
– **陽極氧化軸承杯**：鋁合金材質，耐用可靠

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## 適合哪些騎乘？

公路、鐵人三項、越野公路、礫石騎乘。

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## 技術規格

| 項目 | 規格 |
|—|—|
| 型號 | SM-BBR60 |
| 系列 | ULTEGRA 6800 |
| 五通標準 | 牙紋式（BSA / ITA） |
| 五通殼寬度 | 68mm（BSA）/ 70mm（ITA） |
| 軸心直徑 | 24mm（Hollowtech II） |
| 軸承類型 | 鋼珠軸承，密封式 |
| 軸承杯材質 | 鋁合金，陽極氧化 |
| 重量 | 約 77g |
| 產地 | — |

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## 兼容性

– **曲柄**：SHIMANO Hollowtech II 24mm 軸心曲柄，包括：
– ULTEGRA FC-R8100、FC-R8000、FC-6800
– DURA-ACE FC-9000
– 105 FC-R7100、FC-R7000、FC-5800
– GRX FC-RX820、FC-RX810
– FC-CX70、FC-U5000 等
– **車架**：BSA 英制牙（68mm）或 ITA 意大利牙（70mm）五通殼
– **安裝工具**：TL-FC25 + TL-FC32 / TL-FC33 / TL-FC36；使用衝擊扳手時需用 TL-FC37

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## 包裝內容

– 1 x SM-BBR60 右側軸承杯（含軸承）
– 1 x SM-BBR60 左側軸承杯（含軸承）
– 1 x 五通中管（Inner Sleeve）

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## 備註

– 安裝扭力：35-50 N·m（軸承杯）
– 此為牙紋式五通，不適用於壓入式（Press-Fit）車架。
– 安裝需使用專用工具，建議由合資格技師安裝。

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# SHIMANO ULTEGRA BOTTOM BRACKET (SM-BBR60)

**ULTEGRA-Grade Threaded Bottom Bracket for Hollowtech II Systems.**

The SHIMANO ULTEGRA SM-BBR60 belongs to the ULTEGRA 6800 series. Featuring Hollowtech II technology with outboard bearings, it provides a wider bearing platform for increased stiffness and pedalling efficiency. The sealed bearing design reduces friction, with Shimano claiming approximately 50% less drag than the previous SM-BB6700, while saving around 14-15g in weight.

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## Why SM-BBR60?

– **Hollowtech II Technology**: Outboard bearings for better load distribution and stability
– **Low-Friction Sealing**: Improved seals reduce rotational drag by approximately 50%
– **Lightweight**: Approximately 77g, around 14-15g lighter than SM-BB6700
– **Small Ball Bearings**: Reduced weight while maintaining smooth rotation
– **Anodised Bearing Cups**: Aluminium construction for durability

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## Ideal For

Road, triathlon, cyclocross, gravel riding.

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## Technical Specifications

| Item | Specification |
|—|—|
| Model | SM-BBR60 |
| Series | ULTEGRA 6800 |
| BB Standard | Threaded (BSA / ITA) |
| Shell Width | 68mm (BSA) / 70mm (ITA) |
| Axle Diameter | 24mm (Hollowtech II) |
| Bearing Type | Steel Ball Bearings, Sealed |
| Cup Material | Aluminium, Anodised |
| Weight | Approx. 77g |
| Origin | — |

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## Compatibility

– **Cranks**: SHIMANO Hollowtech II 24mm axle cranks, including:
– ULTEGRA FC-R8100, FC-R8000, FC-6800
– DURA-ACE FC-9000
– 105 FC-R7100, FC-R7000, FC-5800
– GRX FC-RX820, FC-RX810
– FC-CX70, FC-U5000 and more
– **Frames**: BSA English threaded (68mm) or ITA Italian threaded (70mm) shells
– **Installation Tools**: TL-FC25 + TL-FC32 / TL-FC33 / TL-FC36; use TL-FC37 with impact wrench

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## Package Contents

– 1 x SM-BBR60 Right Bearing Cup (with bearings)
– 1 x SM-BBR60 Left Bearing Cup (with bearings)
– 1 x Bottom Bracket Center Sleeve (Inner Sleeve)

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## Notes

– Tightening torque: 35-50 N·m (bearing cups)
– This is a threaded bottom bracket, not suitable for Press-Fit frames.
– Professional installation recommended; requires specific tools.