# OnGuard 8020 Mastiff

- Source: https://stierproducts.com/products/onguard-8020-mastiff
- Category board: https://stierproducts.com/categories/bike-locks
- Placement: #12 of 15 in Bike Locks, D tier
- Brand: OnGuard
- LP on this board: 251
- Last researched: 2026-08-21T09:06:48.597Z
- Method: https://stierproducts.com/methodology
- Dataset: https://doi.org/10.5281/zenodo.22062813 - every board at once, one dated snapshot per release, same licence, prices and photographs left out
- Reuse: Text, rankings, tier assignments, LP values and verdicts are free to quote and reuse with attribution to stierproducts and a link to the source URL (CC BY 4.0: https://creativecommons.org/licenses/by/4.0/). Product photographs are not covered: they belong to their respective owners and are reproduced to illustrate the product being reviewed. Do not redistribute them under this licence.

## Verdict

The OnGuard 8020 Mastiff offers lower security due to a thinner shackle and higher failure rates, making it an inferior choice compared to newer models.

## For

- Heavy-duty chain
- Balanced weight and protection
- Suitable for e-bikes
- Best chain lock overall
- Robust steel core

## Against

- Thinner shackle
- Higher failure rates in lab tests
- Marginal security gains compared to lighter U-locks
- Higher price point than comparable options
- Heavy and bulky

## Flagged as one to avoid

This product entered 2 of 6 runs as one buyers cross-shop but should not buy, rather than as a pick. It is published here rather than dropped.

## Evidence

Consolidated from 2 independent outlets

| Outlet | Said by | Stance | Link | Link status |
| --- | --- | --- | --- | --- |
| bikefella.com | bikefella.com | B | https://bikefella.com/onguard-8020-mastiff-integrated-key-chain-lock/ | fetched and confirmed |
| Top 5 Reviews | Top 5 Reviews | B | https://www.youtube.com/watch?v=1eWBFcq4MY0 | fetched and confirmed |

## Nearest alternatives on this board

| Rank | Product | Tier | Page |
| --- | --- | --- | --- |
| 1 | Litelok X1 | S | https://stierproducts.com/products/litelok-x1 |
| 2 | OnGuard RockSolid | A | https://stierproducts.com/products/onguard-rocksolid |
| 7 | Hiplok DX1000 | C | https://stierproducts.com/products/hiplok-dx1000 |
| 8 | Kryptonite New York U-Lock | C | https://stierproducts.com/products/kryptonite-new-york-u-lock |
| 9 | Litelok X3 | D | https://stierproducts.com/products/litelok-x3 |
| 10 | Kryptonite New York Diamond | D | https://stierproducts.com/products/kryptonite-new-york-diamond |
| 11 | Seatylock Foldylock Forever | D | https://stierproducts.com/products/seatylock-foldylock-forever |
| 13 | Kryptonite Evolution Mini-7 | D | https://stierproducts.com/products/kryptonite-evolution-mini-7 |
| 14 | Hiplok DXF | D | https://stierproducts.com/products/hiplok-dxf |
| 15 | Abus U-Grip Bordo | F | https://stierproducts.com/products/abus-u-grip-bordo |

The full board is at https://stierproducts.com/categories/bike-locks.

## What this tier means

- D: Weak. Hard to recommend when better options cost similar money.

## How to read this

- Each category is researched in four independent runs, one per lens (expert consensus, value, reliability, community pulse). Every run ranks a board of candidates that deliberately includes products buyers cross-shop but should avoid. Placements score on a ranked ladder (LP), and tiers are derived from LP, so no tier is ever assigned by hand.
- LP is this product's points on its own category ladder. It is comparable within a category and not across categories.
- Link status reports what our pre-publication link check found when it fetched the cited URL. It says nothing about the quality of the review.
- A citation with no usable link is listed rather than dropped, and is excluded from the counted total above.

## Image

https://stspimgdevmfyk46r5vwkay.blob.core.windows.net/images/products/onguard-8020-mastiff.webp

Product photographs are not covered: they belong to their respective owners and are reproduced to illustrate the product being reviewed. Do not redistribute them under this licence.