Rotor T4724 Bottom Bracket (BB) 軸承 (外置)

**ROTOR T4724 外置式五通軸承（T47 車架專用）**

# ROTOR T4724 五通軸承（外置式）

**T47 螺紋車架的「是，可以用」方案。**
ROTOR T4724 是專為 T47 螺紋式五通殼設計的外置軸承五通，解決了壓入式系統的兼容性與異響問題。無論你的車架是公路 68mm 還是登山車 73mm，只要曲柄是 24mm 軸心，T4724 都能提供精準穩固的傳動平台。

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## 為何選擇 T4724 外置式？

– **T47 專用外置設計**：軸承位於車架五通殼外側，安裝簡便，維護容易
– **7075 鋁合金軸承杯**：100% CNC 加工，確保軸承精準對位，延長使用壽命並減少摩擦
– **矽膠密封**：有效阻隔塵土與水份，提升耐用性
– **24mm 軸心兼容**：適用於 ROTOR 及 Shimano Hollowtech II 曲柄
– **西班牙製造**：ROTOR 原廠工藝

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## 適合哪些騎乘？

公路、鐵人三項、越野公路、礫石、登山車。

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## 技術規格

| 項目 | 規格 |
|—|—|
| 型號 | T4724 External |
| 五通標準 | T47 螺紋式（47mm x 1.0mm 牙距） |
| 五通殼寬度 | 68mm（公路）/ 73mm（登山車） |
| 軸心直徑 | 24mm |
| 軸承類型 | 鋼軸承 / 陶瓷軸承 |
| 軸承杯材質 | 7075 鋁合金，100% CNC 加工 |
| 密封類型 | 矽膠密封 |
| 重量 | 約 120g（鋼）/ 113.5g（陶瓷） |
| 產地 | 西班牙 |

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## 兼容性

– **曲柄**：ROTOR 24mm 軸心曲柄（Aldhu 24、Vegast 24、2INpower DM 等）、Shimano Hollowtech II（Dura-Ace、Ultegra、105、Tiagra、Sora）、部分 FSA 24mm 軸心曲柄
– **車架**：T47 螺紋式五通殼，寬度 68mm（公路）或 73mm（登山車）
– **安裝工具**：Shimano 標準五通工具

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## 備註

– T47 標準於 2015 年推出，是 BSA 螺紋系統的放大版本，旨在改善壓入式系統的兼容性問題。
– 此為外置式版本，軸承位於車架五通殼外側；另有內置式版本對應 86.5-92mm 寬的五通殼。
– 安裝需使用專用工具，建議由合資格技師安裝。

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# ROTOR T4724 Bottom Bracket (External)

**The “yes” answer for T47 threaded frames.**
The ROTOR T4724 is an external bearing bottom bracket designed specifically for T47 threaded shells, solving the compatibility and creaking issues of press-fit systems. Whether your frame is a 68mm road or 73mm MTB, as long as your crank uses a 24mm axle, the T4724 provides a precise and solid drivetrain platform.

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## Why T4724 External?

– **T47-Specific External Design**: Bearings sit outboard of the frame shell for easy installation and maintenance
– **7075 Aluminium Cups**: 100% CNC-machined for precise bearing alignment, extended bearing life and reduced friction
– **Silicone Seals**: Effective protection against dust and water for enhanced durability
– **24mm Axle Compatible**: Works with ROTOR and Shimano Hollowtech II cranks
– **Made in Spain**: Authentic ROTOR craftsmanship

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## Ideal For

Road, triathlon, cyclocross, gravel, MTB.

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## Technical Specifications

| Item | Specification |
|—|—|
| Model | T4724 External |
| BB Standard | T47 Threaded (47mm x 1.0mm pitch) |
| Shell Width | 68mm (Road) / 73mm (MTB) |
| Axle Diameter | 24mm |
| Bearing Type | Steel / Ceramic |
| Cup Material | 7075 Aluminium, 100% CNC-machined |
| Seal Type | Silicone Seals |
| Weight | Approx. 120g (Steel) / 113.5g (Ceramic) |
| Origin | Spain |

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## Compatibility

– **Cranks**: ROTOR 24mm axle cranks (Aldhu 24, Vegast 24, 2INpower DM, etc.), Shimano Hollowtech II (Dura-Ace, Ultegra, 105, Tiagra, Sora), selected FSA 24mm axle cranks
– **Frames**: T47 threaded shells, 68mm (Road) or 73mm (MTB) width
– **Installation Tool**: Standard Shimano bottom bracket tool

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## Notes

– The T47 standard was introduced in 2015 as a larger version of the BSA threaded system, designed to improve compatibility issues associated with press-fit systems.
– This is the external version with bearings outboard of the frame shell; an internal version is also available for 86.5-92mm wide shells.
– Professional installation recommended; requires specific tools.