# Sportneer 18mm Heavy Duty Bike U Lock with Adjustable Mounting Bracket

Sportneer 18mm U‑Lock: portable, rugged security with a mounting bracket. Practical for urban use and a spare key included. Check fit for your bike.

- [Original product page](https://www.ofertitastop.com/uk/product/sportneer-18mm-heavy-duty-bike-lock)
- [View offer](https://www.ofertitastop.com/uk/visit/sportneer-18mm-heavy-duty-bike-lock)
- Market: UK
- Language: en-GB
- Currency: GBP
- Product updated: 2026-10-20T05:51:18.165Z
- SKU: ofertitastop-uk-119565
- Category: Sporting Goods > Outdoor Recreation > Cycling > Bicycle Accessories > Bicycle Locks
- Source store: amazon UK
- Active deal: Yes
- Price: 14.29 GBP
- Previous price: 18.99 GBP
- Discount: 25%
- Rating: 4.5 / 5
- Reviews: 144

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## Description

## What it is
The Sportneer Bike Lock is a portable, heavy‑duty U‑lock designed to secure bicycles and other gear. With a robust 18mm shackle and a zinc alloy lock core, it aims to balance security with practical everyday use. The locking head is made from alloy steel, and a silicone coating helps protect your bike from scratches while keeping out the elements.

## Key features
This lock measures 9.85 x 6.3 inches and weighs 3.2 lbs, with a shackle thickness of 0.71 inches (18 mm). It ships with three keys, offering a spare for home or office so you’re less likely to be stuck if one is misplaced. A silicone coat adds water, dust and dirt resistance, which matters for bikes parked outdoors.

## Security stance
On paper, the combination of a zinc alloy lock core and alloy steel lock head is designed to resist common tampering methods. Sportneer suggests the lock can withstand hydraulic shear forces up to 12 tons. While this sounds impressive, real‑world security depends on where you park and how you use it, so it’s worth pairing with sensible locking practices (lock through the frame and a solid bike rack, for instance).

## Usability and mounting
The lock comes with an adjustable mounting bracket intended to fit bike tubes with a diameter under 2.2 cm (0.87 in) to 8 cm (3.15 in). This broad range makes it versatile for many bike frames, but it’s prudent to verify your tubing size before purchase to avoid fit issues. The bracket adds convenience for on‑the‑go locking but isn’t a guaranteed solution for every frame. Remember to check the mounting method and whether it aligns with your typical riding setups.

## What it’s best for
If you want a practical, mid‑to‑heavy‑duty lock that travels well and includes a spare key arrangement, this Sportneer model could fit. It’s particularly suitable for casual commutes, short city stops, and outdoor parking where you can’t rely on perfect security. It isn’t necessarily pitched as the ultimate anti‑theft solution for high‑risk environments, so consider your usual parking conditions before deciding.

## What it may fall short on
No lock is a guarantee against determined thieves, and the 18 mm shackle, while sturdy, is not the only factor in security. For some users, the weight (3.2 lbs) may feel heavy for long rides or when carrying other gear. The mounting bracket’s fit depends on your frame size, so a mismatch could complicate everyday use. If you prioritise minimal weight or maximum tamper resistance, you might weigh alternatives differently.

## Before you buy: practical checks
- Confirm your bike’s frame tube diameter and the bracket’s compatibility range. If in doubt, take measurements or consult the product details to avoid an ill fit.
- Consider your typical parking environments. In busy urban areas or places with higher theft risk, pairing a strong lock with smart locking practices is wise.
- Check the spare keys policy and decide where to store them securely to prevent loss.
- Compare weight and bulk against your daily carry goals. A lock should be convenient for you, not just secure on paper.

## Practical use case
Imagine you’ve parked at a busy train station for a short break. You lock the frame and wheel with the 18 mm U‑lock, stash a spare key in your bag, and leave the other two keys at home. The silicone coating helps keep the frame pristine, and you know you’ve chosen a practical, durable option for routine urban stops.

## What to compare it with (implied alternatives)
If you’re weighing options, you might think about other mid‑range U‑locks with similar shackle sizes or lighter portable locks for shorter errands. For high‑risk locations, you may lean toward heavier or double‑locking solutions. The Sportneer lock sits in a pragmatic middle ground: more secure than basic locks, but not an absolute guarantee in extreme scenarios.

## Final verdict
Final verdict: worth considering if you prioritise a balanced mix of portability, a robust 18 mm shackle, and the convenience of an adjustable mounting bracket, provided you’re parking in moderate‑risk environments. It may not be the best fit for riders who need the lightest option or who regularly park in high‑theft areas.

## FAQ
- How secure is the 18 mm lock? It is designed to resist common tampering and hydraulic shear forces on paper, but real‑world security depends on where and how you park.
- Will it fit my bike frame? It depends on your frame’s tube diameter, the bracket targets a range of sizes, so measure before buying.
- How many keys are included? Three keys are supplied, with one you can carry and two spares kept elsewhere.
- Is it heavy to carry? At around 3.2 lbs, it’s not the lightest option, but many riders find the durability worthwhile for urban use.

## Images

![Sportneer 18mm Heavy Duty Bike U Lock with Adjustable Mounting Bracket — 1](https://www.ofertitastop.com/i/C1rfzqj6dpFdBMbxuuJgKL9BagwvivaCwnZypDZR81ikK2A_pzjkKb8bnqnfYLFneq8DUqV6iyHAGHB2pf1oS6oXR7Rs3a2YJ35qnjmvZ4oSfC77OXEEtJ_67Q.jpg)

![Sportneer 18mm Heavy Duty Bike U Lock with Adjustable Mounting Bracket — 2](https://www.ofertitastop.com/i/_toGkiZvME-1KInBhaJ1gDb_nH-umsEMRvXcAkKq54HjbYqoftObGKNPE99G6-T0hl2BZxco4BIY1-Ed0-fK17HV_A5SKkGb4KAxnD5EEB4NBRCw17hjSoG5mQ.jpg)

![Sportneer 18mm Heavy Duty Bike U Lock with Adjustable Mounting Bracket — 3](https://www.ofertitastop.com/i/x8XEec14qTHz74CqiLdNYVIHkLW9bMBv2cLHQaAMIU83pQqAb4m5kv4qFq090GQ_nC7o1t4LkV1G0RbyOOk3uX3MgXgjofPHHwb0Ov0sa7THdMYGOYCE1aiauA.jpg)

![Sportneer 18mm Heavy Duty Bike U Lock with Adjustable Mounting Bracket — 4](https://www.ofertitastop.com/i/Yyb4Uk6zhAxNA1gyo5ka3VPBBM5MCTwd5x3we8BI44za0SNFG9N279DZuj7ZTc--wVVyL2NWYkrgyZM5cOqrJ7QHXZ-QP9ikMBCw-n_eU9XRJqqhpecK8eu7ww.jpg)

![Sportneer 18mm Heavy Duty Bike U Lock with Adjustable Mounting Bracket — 5](https://www.ofertitastop.com/i/zBhIEudbavo9zA7dxyThGwIBvIZSxF4IaDiJrMOw7tPJTaVQildCeZ4AsNPDkiBP1ATxtaW7UHX4cIcO0EXxZp4Bvf-iXS_kl4moZ58bgRBRIVeeWIWTb8npig.jpg)