描述
SHIMANO GRX RX820-F 前變速器採用肘節式連結結構，以及整合式的線張力調節器，提供更輕盈的前變速操控與更簡易的設定。其中設計採用 2.5 mm 外推 Chain Line，提供更寬廣的輪胎間隙，適合在混合地形騎乘，並涵蓋 17T 前齒盤範圍，提供更廣泛的檔位選項。
BENEFIT
更輕巧的前方變速機構
加寬輪胎間隙
更寬範圍前方齒比
FEATURE
順暢自然的變速操作
肘節式連結結構
Chain line +2.5 mm 與傳統公路車前變速器之比較
17T BENEFIT 前變速器調整精準簡便
支援外走線和內走線設計
整合式內線張力調整功能
PRODUCT SPECIFICATION
| Series | GRX | ||
|---|---|---|---|
| Model no. | FD-RX820 | ||
| Color | 1 | Series color | |
| 2 | – | ||
| Front speeds | 2 | ||
| Rear speeds | 12 | ||
| Compatible chain | HG 12-speed | ||
| Action | TOP SWING | – | |
| Down swing | ✔ | ||
| Mount | Clamp band (mm) | 28.6 | – |
| 31.8 | – | ||
| 34.9 | – | ||
| Brazed-on | ✔ | ||
| Cable adjust | ✔ | ||
| Cable route type | Top-pull exclusive | – | |
| Chain line (mm) | 47 | ||
| Chainstay angle (deg.) | 63-66 | ||
| Top gear teeth | 46-48T | ||
| Total capacity | 17T | ||
| Applicable top-mid tooth difference | – | ||
| Angled clamp band design | – | ||
| Multi-bearing construction | – | ||
| Link bushings | 7 | ||
| Front clamp band | Material | – | |
| Finish | – | ||
| Rear clamp band, base bracket | Material | – | |
| Finish | – | ||
| Outer link | Material | GFRP | |
| Finish | Painted | ||
| Inner link | Material | Steel | |
| Finish | Plated | ||
| Chain guide | Material | Steel | |
| Finish | Chrome plated | ||
| Cable fixing screw | Material | Steel | |
| Finish | Plated | ||
| Stroke adjusting screw | Material | Steel | |
| Finish | Plated | ||
| Average weight (g) (band type: L size, direct type w/ screw) | 96 | ||
| Note | |||
Model No FD-RX820 Series GRX 前變速別 2 後變速別 12 相容鏈條 HG 12 速 動作 下擺式 ✔ 固定座 直附式 ✔ 內線張力調節 ✔ Chain Line (mm) 47 後下叉與立管角度 (º) 63-66 相容最大齒片 46-48T 總齒包容量 17T 連桿軸襯 7 平均重量 96 Color 系列顏色
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