# OnGuard RockSolid 8590

- Source: https://stierproducts.com/products/onguard-rocksolid-8590
- Category board: https://stierproducts.com/categories/bike-locks
- Placement: #3 of 15 in Bike Locks, A tier
- Brand: OnGuard
- LP on this board: 745
- 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

Performance in the YouTube test demonstrates effectiveness against common attack methods.

## For

- Strong resistance to attacks
- Well-tested on video
- Robust construction
- High security rating
- Portable design

## Evidence

Consolidated from 3 cited sources across 2 outlets

| Outlet | Said by | Stance | Link | Link status |
| --- | --- | --- | --- | --- |
| Cycling Weekly | cyclingweekly.com | B | https://www.cyclingweekly.com/news/product-news/7-of-the-best-bike-locks-5221 | fetched and confirmed |
| road.cc | road.cc Tech | B | https://road.cc/content/tech-news/recommends-september-2025-scribe-cayon-outstanding-value-316237 | fetched and confirmed |
| road.cc | Rebecca Bland | A | https://road.cc/content/review/onguard-rocksolid-8590-315735 | 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 |
| 4 | Abus Granit Super Extreme | B | https://stierproducts.com/products/abus-granit-super-extreme |
| 5 | Abus Bordo Granit | B | https://stierproducts.com/products/abus-bordo-granit |
| 6 | Abus Granit Super Extreme 2500 | B | https://stierproducts.com/products/abus-granit-super-extreme-2500 |
| 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 |
| 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.

## Frequently asked questions

### Who is the OnGuard RockSolid 8590 for?

The OnGuard RockSolid 8590 is for the rider who wants a high-security U-lock whose resistance has been shown on camera. Reviewers tested it on video against common attack methods and it held up, which earns it A tier and third place on our board. If you want the best value on the board, the Litelok X1 in S tier costs less for most of the security. If grinder resistance is the whole question, the OnGuard RockSolid ranks one place higher for that.

### How well does the OnGuard RockSolid 8590 resist attack?

Well, on the evidence of video testing. Reviewers describe strong resistance to the common attacks a street thief uses, robust construction and a high security rating. The board does not record a specific time-to-cut for this model, so treat it as a high-security lock that buys time rather than one that cannot be beaten. Nothing on our board is grinder-proof.

### Should I buy the OnGuard RockSolid 8590 or the Litelok X1?

Buy the Litelok X1 if value is the deciding factor. It is the only S tier lock on our board and reviewers rate it the best performance for its price. Buy the OnGuard RockSolid 8590 if you want the heavier-duty build and the reassurance of seeing it tested on video. Both are sound choices and either beats everything from C tier down.

### Is the OnGuard RockSolid 8590 easy to carry?

Reviewers call it portable, which is unusual for a lock with this much steel. It is still a U-lock, so plan on a frame mount or a bag rather than a pocket. If you need something that folds, none of the A tier locks do, and you would be trading security for convenience.

### How do you keep the OnGuard RockSolid 8590 working in winter?

Lubricate the cylinder with a dry PTFE or graphite product before the wet season and again mid-winter. Store the lock keyway down so water drains rather than freezing inside. If the key turns stiffly, warm the lock and relubricate rather than forcing it, since a snapped key is the most common winter failure on any U-lock.

## What this tier means

- A: Excellent. Strongly recommended, beaten only by the very best.

## 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-rocksolid-8590.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.