# OnGuard RockSolid - Source: https://stierproducts.com/products/onguard-rocksolid - Category board: https://stierproducts.com/categories/bike-locks - Placement: #2 of 15 in Bike Locks, A tier - Brand: OnGuard - LP on this board: 803 - 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 Strongest U-lock against angle grinders, low weight and excellent value. ## For - Best overall choice for angle-grinder resistance - Lightweight compared to other high-security U-locks - Exceptional value for the price - Top pick for grinder resistance - Lightweight design ## Evidence Consolidated from 15 cited sources across 12 outlets | Outlet | Said by | Stance | Link | Link status | | --- | --- | --- | --- | --- | | The Best Bike Lock | thebestbikelock.com | C | https://thebestbikelock.com/best-u-lock/onguard-rocksolid-review/ | fetched and confirmed | | Cycling Electric | mark sutton, Geoff Waugh | B | https://www.cyclingelectric.com/buyers-guides/best-bike-locks-2025 | fetched and confirmed | | Cyclist | Cyclist magazine | B | https://www.cyclist.co.uk/buying-guides/buyers-guide-choosing-the-best-bike-lock | fetched and confirmed | | The Best Bike Lock | thebestbikelock.com | C | https://thebestbikelock.com/security/angle-grinder-proof-bike-lock/ | fetched and confirmed | | Cyclingnews | cyclingnews.com | B | https://www.cyclingnews.com/cycling-kit-accessories/keep-the-bike-thieves-at-bay-with-the-onguard-rocksolid-u-lock-its-normally-one-of-the-most-expensive-bike-locks-on-the-market-but-right-now-its-20-percent-off-at-amazon/ | fetched and confirmed | | The Sweet Cyclists | The Sweet Cyclists | B | https://www.youtube.com/watch?v=uuVI2UHxuQQ | fetched and confirmed | | The Best Bike Lock | The Best Bike Lock | B | https://www.youtube.com/watch?v=uC6gpNQ4EBU | fetched and confirmed | | Extra UK | Extra UK | B | https://www.youtube.com/watch?v=xg4nB2n2DAQ | fetched and confirmed | | DedieMoon | DedieMoon | B | https://www.youtube.com/watch?v=y6DFXxATC2Y | fetched and confirmed | | Cycling Weekly | cyclingweekly.com | B | https://www.cyclingweekly.com/news/product-news/7-of-the-best-bike-locks-5221 | fetched and confirmed | | ProCyclingUK | Mathew Mitchell | B | https://procyclinguk.com/best-bike-locks-for-commuting-uk-2026-our-complete-buying-guide/ | fetched and confirmed | | E-Catalog | e-catalog.com | B | https://e-catalog.com/ONGUARD-ROCKSOLID-8590.htm | fetched and confirmed | | Cycling Weekly | cyclingweekly.com | B | https://www.cyclingweekly.com/group-tests/wrecked-and-rated-i-put-five-angle-grinder-resistant-bike-locks-to-the-ultimate-test | fetched and confirmed | | WIRED | Ryan Waniata | B | https://www.wired.com/gallery/best-electric-bike-locks/ | 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 | | 3 | OnGuard RockSolid 8590 | A | https://stierproducts.com/products/onguard-rocksolid-8590 | | 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 | | 12 | OnGuard 8020 Mastiff | D | https://stierproducts.com/products/onguard-8020-mastiff | | 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 for? The OnGuard RockSolid is for the rider whose main worry is a thief with an angle grinder. Reviewers call it the strongest U-lock against grinders on our board, and it does that at a low weight and a price they describe as exceptional value. It sits in A tier, second only to the Litelok X1. If grinder attacks are not common where you park, the Litelok X1 gives you high security for less. ### Does the OnGuard RockSolid stop an angle grinder? It resists one better than any other U-lock on our board. Reviewers name the OnGuard RockSolid their top pick for grinder resistance. No lock is grinder-proof, so what you are buying is time, noise and spent discs, which is usually enough to send a thief to an easier target. Compare that with the Kryptonite New York U-Lock, which reviewers cut with a handheld grinder in under a minute. ### Is the OnGuard RockSolid the same as the OnGuard RockSolid 8590? They are listed separately on our board because reviewers tested them separately. The OnGuard RockSolid 8590 is a specific model number in the RockSolid line, and it also sits in A tier on strong video-tested resistance to common attacks. The OnGuard RockSolid entry ranks one place higher on grinder resistance, weight and value. If you are choosing between them, either is a sound A tier buy and the 8590 is the one to search for by model number. ### Is the OnGuard RockSolid heavy? No, not for what it resists. Reviewers single out the OnGuard RockSolid as lightweight compared with other high-security U-locks. Grinder-resistant locks usually pay for their resistance in weight, so this is the reason it ranks where it does. Carry it in a frame mount or a pannier rather than a jersey pocket. ### How should you lock a bike with the OnGuard RockSolid? Put the shackle through the frame and the rear wheel and around a fixed object that cannot be lifted or cut. Fill the shackle so there is no room to fit a jack or lever, keep it off the ground and point the keyway down. A second lock of a different type for the front wheel makes a thief carry two tools. ## 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.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.