The Royal Enfield 589108/A Top Yoke is the original-specification upper steering yoke used in the Thunderbird X BS4steering stem assembly.
Royal Enfield parts catalogue data identifies 589108/A as “TOP YOKE” and shows it as part of the steering-stem assembly for the Thunderbird X 350 and Thunderbird X 500 2018 BS4.
The top yoke forms an important part of the motorcycle’s front steering and fork mounting system, connecting the upper fork area with the steering assembly.
Key Features
- Genuine Royal Enfield replacement part
- Part Number: 589108/A
- Catalogue Description: TOP YOKE
- Upper steering yoke
- Original Thunderbird X BS4 specification
- Factory-type fork mounting arrangement
- Suitable replacement for damaged or bent top yoke
Compatibility
- Royal Enfield Thunderbird X 350 BS4
- Royal Enfield Thunderbird X 500 BS4
- 2018 Thunderbird X BS4
The catalogue specifically lists 589108/A in the steering-stem assembly of both Thunderbird X 350 and Thunderbird X 500 BS4.
Application
Top Yoke / Upper Fork Yoke / Steering Top Yoke
Used in the upper portion of the steering stem and fork assembly.
Package Contents
- 1 × Royal Enfield 589108/A Top Yoke
Note: Forks, steering stem, handlebar raisers, bolts, bearings and other steering components are separate parts unless specifically included by the seller.









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