• Royal Enfield 521089/B rubber strap Thunderbird battery tool holder
  • 521089/B Rubber Strap – Thunderbird 350 & 500 UCE OEM
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UNDER THE HOOD

Royal Enfield 521089/B – Rubber Battery / Tool Strap for Thunderbird 350 & Thunderbird 500 (TBTS & NTB) – Genuine OEM

Royal Enfield 521089/B – Rubber Battery / Tool Strap for Thunderbird 350 & Thunderbird 500 (TBTS & NTB) – Genuine OEM

Rs. 34.00
Rs. 35.00 Rs. 34.00
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Important Order Policy
Please order only after confirming the part number, model, variant, year, side, connector type and compatibility. All orders are non-cancellable once placed. Correctly shipped spare parts are not eligible for return, exchange or refund due to wrong selection, wrong diagnosis, fitment mismatch, mechanic recommendation or change of mind. Electrical/electronic items are additionally non-returnable once opened, installed, plugged in, tested or used. Wrong item, damaged item or missing item claims require a complete unboxing video within 24 hours. Read full Return & Warranty Policy

The Royal Enfield 521089/B – Rubber Strap Thunderbird is the genuine OEM rubber retaining strap used on Thunderbird UCE models to secure components like the battery/tool box cover on the frame. If your original strap has become hard, cracked, or snapped with age, this is the exact factory part designed to replace it.

Official Royal Enfield price lists clearly describe 521089/B as “RUBBER STRAP THUNDERBIRD” under rubber components. European OEM portals (Bike-Parts-RoyalEnfield / Recambios) list 521089/B – RUBBER STRAP THUNDERBIRD as a genuine part, identical to the one fitted at the factory.

Because this is an OEM elastic strap, it has the correct length, elasticity and hook profile to hold the battery/tool cover firmly without overtension or rattles. Cheap aftermarket straps often lose elasticity quickly or don’t hook correctly, leading to loose panels or, worse, a partially unsecured battery. With 521089/B, you restore the bike back to factory-secure mounting with minimal cost and effort.

Key Features

  • Genuine Royal Enfield part – part number 521089/B, described in official/price lists as “RUBBER STRAP THUNDERBIRD”.

  • Listed by Bike-Parts-RoyalEnfield / Recambios as rubber strap for Thunderbird, supplied as the same strap used on the bike from new.

  • Confirmed compatible with TBTS, NTB 350 & NTB 500 by Indian dealer The Spares Company (Thunderbird UCE family).

  • Functions as battery/toolbox/side-cover retaining strap – approx 3" rubber strap designed to hold components securely in place.

  • Correct elasticity, length and hooks to work with Thunderbird battery carrier and frame tabs; no jugaad or extra clips needed.

  • Official HSN 40169990 rubber component – durable automotive-grade rubber, not cheap generic band.

  • Ideal for age-related failures where the old strap has gone hard/cracked or broken during service.

  • Low-cost OEM part that helps prevent vibration damage or loose panels by keeping covers properly clamped.

  • Supplied as a single strap (1N) – typically one required per mounting location.

Compatibility Table

Model Engine / Platform BS Stage / Years Status Notes
Thunderbird 350 (TBTS) 346cc UCE (TBTS) BS3 UCE (≈2009–2014) ✅ Confirmed
Thunderbird 350 (NTB 350) 346cc UCE (NTB) BS4 / ABS (≈2015–2019) ✅ Confirmed Same listing marks NTB 350 along with TBTS & NTB 500.
Thunderbird 500 (NTB 500) 499cc UCE (NTB 500) BS3–BS4 (Thunderbird 500 UCE era) ✅ Confirmed

CHECK PART NUMBER BEFORE PURCHASE 

Variants / Revisions

This listing covers:

  • Part Number: 521089/B

  • Description: Rubber Strap – Thunderbird (Battery/Tool Strap)

  • Quantity: 1 piece

Other related refs:

  • Some catalogues mention 521089/A as an earlier revision of the same “Strap – Rubber” for Thunderbird; /B is the updated suffix but still serves the same application.

You can mention in your Shopify description (short note) that 521089/B supersedes 521089/A where applicable.

FAQs

Q1. What exactly is Royal Enfield part 521089/B used for?
521089/B is a rubber retaining strap used on Thunderbird models to secure the battery/tool cover or similar components to the frame. Official RE price lists and parts portals describe it simply as “RUBBER STRAP THUNDERBIRD”.

Q2. Which bikes does 521089/B officially fit?
Indian dealer The Spares Company lists 521089 Rubber Strap Thunderbird with confirmed fitment for TBTS, NTB 350 and NTB 500, i.e., the UCE Thunderbird 350 & 500 family. We therefore treat it as confirmed for Thunderbird 350 (TBTS & NTB) and Thunderbird 500 (NTB).

Q3. Can I use this strap on other Royal Enfield models?
Hitchcocks notes that this strap can be used on “virtually any motorcycle” as a generic battery/tool strap. However, outside of Thunderbird 350/500 UCE, we cannot guarantee exact fit (length/hook points) without checking your bike. If using on other models, treat it as a universal strap and verify visually.

Q4. How many straps do I need to order?
Most Thunderbird applications use one strap per battery/tool cover location. This part is sold per piece (1N), so order 1 if you’re replacing a single broken strap, or more if you’re refreshing multiple locations or keeping a spare.

Q5. Is this different from local aftermarket rubber bands?
Yes. 521089/B is an OEM strap with correct rubber hardness, length and hooks, designed for the Thunderbird frame and battery carrier. Cheap generic straps can be too long/short or lose elasticity quickly, leading to loose covers or rattles.

Verify Fitment on Official Brand Portals

For selected genuine spare parts, you can cross-check the part number on the official brand portals before ordering.

Royal Enfield Official Spares Portal

Hero MotoCorp Official eCatalogue

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