Genuine Royal Enfield Handle Bar Assembly (U4) for Thunderbird X 350 ABS BS4 | 1120012/B

Replace a bent, rusted, or vibration-prone handlebar with a Genuine Royal Enfield Handle Bar Assembly, Part No. 1120012/B—listed in parts price documents as “HANDLE BAR ASSY – U4”. 

A correct-spec handlebar is not just about looks; it directly impacts steering feel, rider posture, cable routing clearance, and safety under braking and cornering. OEM-spec bars maintain the correct diameter for switch housings, lever perches, mirrors, and grips—helping avoid play, clamp damage, or misalignment that’s common with many aftermarket “universal” handlebars.

Important accuracy note (to reduce wrong orders/returns): official microfiche dealer networks publicly show a closely related handlebar variant 1120012/D (HANDLE BAR ASSY – U4D), but they do not clearly publish fitment mapping for 1120012/B in the same way.  Another dealer listing maps base part 1120012 to Thunderbird X 350 ABS (BS IV). 
Therefore, buy 1120012/B only if your old part/box confirms the exact suffix (/B) or you have a VIN-based confirmation.

Key Features 

• Genuine Royal Enfield handlebar assembly (OEM-spec replacement) 

• Part Number: 1120012/B (listed as Handle Bar Assy – U4)

• Restores correct steering ergonomics and rider posture

• OEM diameter for proper fit of switch housings, grips, levers, and mirrors

• Ideal for accident repair, restoration, or replacing bent bars

• Helps reduce misalignment/rattle seen with many universal aftermarket bars

• Compatible-family reference: microfiche lists 1120012/D (U4D) handlebar variant 

• Recommendation: check cable routing + riser clamps during installation

Compatibility Table (PLEASE CHECK PART NUMBER BEFORE PURCHASE)

• Match your old part number exactly: 1120012
  

FAQs 

1) Is 1120012/B genuine Royal Enfield or aftermarket?
This listing is positioned as Genuine/OEM-spec; the “1120012” handlebar is sold by dealers as Royal Enfield genuine. 

2) Will 1120012/B fit all Thunderbird / Thunderbird 350 / Thunderbird 500?
Not confirmed. Only a dealer mapping exists for base part 1120012 → Thunderbird X 350 ABS (BS IV). Suffix /B must be matched by old part/box or VIN confirmation. 

3) What does “U4 / U4D” mean?
It’s the internal naming used in parts references for specific handlebar variants; microfiche lists 1120012/D = Handle Bar Assy – U4D, and price documents list 1120012/B = Handle Bar Assy – U4. 

4) Why not buy a universal handlebar instead?
Universal bars often cause switch housing mismatch, incorrect pullback, cable tightness, and clamp issues. OEM-spec bars preserve factory geometry and mounting.

5) What should I check before installation?
Inspect riser/clamp condition, cable routing, throttle free-play, and alignment before final tightening.