# ONGUARD bike chain lock MASTIFF 8121 — 150 cm x 8 mm chain, 5 coded keys

**URL:** https://aio.lv/en/product--onguard-ong-8121--12069879
**Data updated:** 2026-03-12 21:49 (EET)
**Category:** Kids’ Ride-On Accessories
**Manufacturer:** ONGUARD
**Manufacturer code:** ONG-8121
**EAN:** 7290001281215
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 47.49 €
**Prices and availability valid until:** 2026-07-26 23:59
**Price without VAT (21%):** 39.25 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--onguard-ong-8121--12069879

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 15.07.2026 | free |
| Pickup points | 20.07.2026 | 1.89 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

ONGUARD MASTIFF 8121 is a bike chain lock featuring a 150 cm long, 8 mm thick steel chain for securing bicycles and other outdoor equipment. The set includes five coded keys for user access and key replacement. Designed for everyday use to protect against opportunistic theft, the chain lock offers flexible mounting and is suitable for city commuting, parking, and short-term storage.

## Long description

ONGUARD MASTIFF 8121 is a chain lock designed for securing bicycles and outdoor equipment. The lock features a 150 cm long, 8 mm thick hardened steel chain sheathed in protective fabric to reduce frame scratching and to allow flexible routing around frames, racks or posts. The set includes five coded keys to provide replacement options and controlled access. Intended for everyday urban use, this chain lock helps deter opportunistic theft during commutes, short stops and routine parking.
Advantages
The MASTIFF 8121 combines a long, flexible chain with a compact locking head and a fabric cover that protects bicycle paintwork. An 8 mm hardened steel link profile gives resistance to casual cutting tools while the included coded keys simplify key replacement and make it easy to provide spare keys for multiple users. Its length makes it practical for locking both wheel and frame to a fixed object without requiring complex positioning.
Suitable for
 City commuting and daily bike parking
 Short-term outdoor storage of bicycles and scooters
 Securing kids’ ride-on toys and small outdoor equipment
 Locking frame and wheel to bike racks or posts
Key specifications
 Chain length: 150 cm
 Chain thickness: 8 mm
 Material: hardened steel chain with protective fabric sleeve
 Locking mechanism: keyed cylinder with coded keys
 Number of keys supplied: five coded keys
 Intended use: everyday urban security and short-term protection
How to use
Wrap the chain around the bicycle frame and a fixed object such as a bike rack or post, ensuring at least one wheel and the frame are enclosed where possible. Insert the chain into the locking head and engage the keyed cylinder; turn the supplied coded key to lock. Keep spare keys in a secure place and use the protective fabric sleeve to avoid contact between the chain and painted surfaces. When not in use, the flexible chain can be coiled and stored on the bike using a mounting bracket or carried in a bag.
Usage recommendations
For best results, use the chain in combination with a secure anchoring point and avoid leaving the bicycle unattended for extended periods in high-risk areas. Regularly inspect the chain and locking cylinder for wear or corrosion, and keep the keyed cylinder clean and lubricated according to general lock maintenance practices.

## FAQ

### How much does the ONGUARD MASTIFF 8121 bike chain lock cost, and is it available for purchase?

The price is 47.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 30 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 15.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All ONGUARD products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized ONGUARD service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12069879/67554820_large.webp