# OnGuard Mastiff 8122 Bicycle Chain Lock

**URL:** https://aio.lv/en/product--onguard-ong-8122--12572934
**Data updated:** 2026-07-09 14:54 (EEST)
**Category:** Bicycle accessories
**Manufacturer:** ONGUARD
**Manufacturer code:** ONG-8122
**EAN:** 7290001281222
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 28.49 €
**Prices and availability valid until:** 2026-08-09 23:59
**Price without VAT (21%):** 23.55 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--onguard-ong-8122--12572934

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 30.07.2026 | free |
| Pickup points | 04.08.2026 | 1.89 EUR |
| Courier delivery to door | 04.08.2026 | 4.99 EUR |

## Summary description

The OnGuard Mastiff 8122 is a high-security bicycle chain lock designed to provide robust protection against theft. Featuring a durable hardened steel chain and a reliable locking mechanism, this lock is suitable for securing bicycles in various urban environments. Its flexible design allows for easy attachment to fixed objects, ensuring peace of mind for cyclists looking for a dependable security solution for their equipment.

## Long description

The OnGuard Mastiff 8122 bicycle chain lock is a high-security solution engineered to protect your bicycle from theft in demanding urban environments. Constructed with heavy-duty hardened steel links, this chain lock offers significant resistance against cutting and sawing attempts. The integrated locking mechanism is designed for reliability and ease of use, providing a dependable barrier for your bike when parked in public spaces.
Advantages
The primary benefit of the OnGuard Mastiff 8122 is its robust construction, which utilizes hardened steel to withstand physical attacks. Its flexible chain design provides versatility, allowing you to secure your bicycle frame and wheel to a wide variety of fixed objects such as bike racks, poles, or railings. The protective fabric sleeve covering the chain prevents scratches and damage to your bicycle's paintwork, ensuring that your equipment remains in pristine condition while locked.
Suitable for
Securing bicycles in high-theft urban areas
Locking bikes to fixed street furniture like racks or poles
Daily commuters requiring reliable security
Protecting high-value bicycles and e-bikes
This lock may not be suitable for cyclists who prioritize extreme weight reduction, as the hardened steel construction makes it significantly heavier than cable locks. It might also be less convenient for those who require a compact, pocket-sized security solution, as the chain requires more space for storage when not in use.
Key specifications
Hardened steel chain links
Protective scratch-resistant fabric sleeve
High-security locking mechanism
Flexible design for versatile attachment
To use the OnGuard Mastiff 8122, wrap the chain around your bicycle frame and the chosen fixed anchor point. Ensure that the chain is pulled taut to minimize the space available for potential thieves to insert tools. Insert the locking end into the mechanism until it clicks securely, and verify that the lock is fully engaged before leaving your bicycle unattended.
What to consider before purchase
Weight of the chain relative to your carrying capacity
Length required to reach your preferred anchor points
Compatibility with your bicycle frame geometry
For optimal security, always lock your bicycle through the frame and at least one wheel to a solid, immovable object. Keep the lock mechanism clean and lubricated periodically to ensure smooth operation in all weather conditions.

## FAQ

### How much does the OnGuard Mastiff 8122 Bicycle Chain Lock cost, and is it available for purchase?

The price is 28.49 € (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 30.07.2026 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/12572934/68935145_large.webp