---
product_id: 1646161
title: "Kryptonite Keeper Long Shackle 12mm U-Lock Bicycle Lock with FlexFrame-U Bracket"
brand: "kryptonite"
price: "S$100"
currency: SGD
in_stock: true
reviews_count: 13
category: "Kryptonite"
url: https://www.desertcart.sg/products/1646161-kryptonite-keeper-long-shackle-12mm-u-lock-bicycle-lock-flexframe
store_origin: SG
region: Singapore
---

# 12mm hardened steel shackle 4" x 10" interior locking dimensions Double deadbolt anti-rotation design Kryptonite Keeper Long Shackle 12mm U-Lock Bicycle Lock with FlexFrame-U Bracket

**Brand:** kryptonite
**Price:** S$100
**Availability:** ✅ In Stock

## Summary

> 🔐 Secure your ride, own the streets—don’t get left unlocked!

## Quick Answers

- **What is this?** Kryptonite Keeper Long Shackle 12mm U-Lock Bicycle Lock with FlexFrame-U Bracket by kryptonite
- **How much does it cost?** S$100 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/1646161-kryptonite-keeper-long-shackle-12mm-u-lock-bicycle-lock-flexframe)

## Best For

- kryptonite enthusiasts

## Why This Product

- Trusted kryptonite brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rock-Solid Security:** 12mm hardened steel shackle resists bolt cutters and leverage attacks for peace of mind in urban jungles.
- • **Ergonomic Key Design:** Stainless steel keys crafted to reduce torque and prevent bending—because every detail counts.
- • **Versatile Long Reach:** 4" x 10" locking space lets you secure your bike to meters, poles, or fences others can’t reach.
- • **Smart Anti-Theft Defense:** Double deadbolt design locks down your bike with pick and drill resistant cylinder technology.
- • **Lifetime Support & Protection:** Key Safe program ships replacement keys globally + $500 anti-theft reimbursement for ultimate confidence.

## Overview

The Kryptonite Keeper Long Shackle U-Lock features a 12mm hardened steel shackle with a double deadbolt anti-rotation design, providing robust resistance against bolt cutters and leverage attacks. Its 4" x 10" interior locking dimensions offer versatile securing options, while the pick and drill resistant cylinder ensures enhanced security. Ergonomically designed stainless steel keys reduce torque and bending risk. Backed by Kryptonite’s Key Safe program, lifetime warranty, and up to $500 anti-theft reimbursement, this lock is ideal for quick urban stops and longer suburban or rural parking.

## Description

The Kryptonite Keeper Long Shackle U-Lock features a 12 mm hardened steel shackle with a double deadbolt anti-rotation design that resists bolt cutters and twisting leverage attacks. The lock’s disc-style cylinder with center keyway is protected by a vinyl coating and is pick and drill resistant. It includes two stainless steel keys with an ergonomic design to reduce torque and keep them from bending or breaking. Rated at a 5 / 10 on our security scale, the Keeper Long Shackle is good for quick stops in a metropolitan area, a couple hours in the suburbs or all day & overnight in rural areas. It also includes our patented Side Mount, Snap-In Bracket providing convenient U-Lock transport. The combination of these great features and our support programs including Key Safe, Anti-Theft Protection, and Lifetime Warranty make Kryptonite Bicycle Locks the best choice for protecting what you value.

Review: Lost key for old lock needed replacement - I had a long Kryptonite bike lock but lost one of the set of keys and was not happy with having one key for a lock for my bike. So I ordered this off desertcart because I could not find an affordable long U-lock in my local bike shops, and there are several in the area. I was surprised that I could keep the old U part of the lock and use it with the new locking part. Why would I do such a thing? I had a little trouble getting the plastic part on the new U off and did not want it as I was not going to attach it to my bike. I'm in a city with a lot of bike thefts and so I have a crappy looking bike and three (sometimes 4) locks, I'm not attaching them all to my bike. Ugly bike+3 bike locks*leaving bike outside=Not getting stolen in 10 years. I love the long U lock because I can get it around a parking meter base, the bike frame and sometimes the front wheel. The regular bike locks are too short to get them around whatever I'm attaching the bike to (iron fence, skinny pole, railing, etc) and my frame.
Review: Excellent lock, slightly faulty bracket - This is the third Kryptonite lock I buy and the first Keeper. The lock works perfectly. I have never had any problems with Kryptonite lock in general, and this was not the exception. The lock itself is not as heavy as other, "more secure" locks from Kryptonite, but it seems just as sturdy. I feel safe leaving my bike in a park-and-ride for the whole day. They changed the bracket and it's much easier and straightforward to attach it to the bike, but it has the same problems that that other one had. Mainly, it gets slightly loose over time, not enough to stop being functional, but enough to make it sound like all the screws in the bike are about to fall off. It is a matter of tightening it every so often, or just carry the lock in your backpack like most people do. Not a deal breaker though. Overall, the lock is five stars (the bracket not so, but compared to other brackets out there, it is on par).

## Features

- 12mm Hardened Steel Shackle Resists Hand Tools, Bolt Cutters, and Leverage Attacks
- Interior Locking Dimensions; 4" x 10"
- Key Safe Program; Kryptonite will ship your first 2 keys for free, globally, in the event you lose them.
- Anti-Theft Protection Offer; Up to $500 Reimbursement
- Lifetime

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000O38DDE |
| Best Sellers Rank | #676,043 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1,128 in Bike Locks |
| Brand | Kryptonite |
| Brand Name | Kryptonite |
| Color | Black |
| Control Method | Touch |
| Controller Type | Hand Control |
| Customer Reviews | 4.0 4.0 out of 5 stars (445) |
| Date First Available | November 19, 2007 |
| Finish Type | Painted |
| Global Trade Identification Number | 00720018997962 |
| Included Components | Locks |
| Item Dimensions LxWxH | 11.5 x 1.18 x 4.02 inches |
| Item Package Dimensions L x W x H | 13.78 x 7.99 x 2.4 inches |
| Item Weight | 1.2 Kilograms |
| Item dimensions L x W x H | 11.5 x 1.18 x 4.02 inches |
| Lock Type | U-lock |
| Manufacturer | Kryptonite |
| Model Name | Keeper LS |
| Model Year | 2007 |
| Number of Items | 1 |
| Number of Pieces | 1 |
| Package Weight | 1.25 Kilograms |
| Part Number | 997962 |
| Recommended Uses For Product | low crime areas. |
| Shape | U Shape |
| Size | 4" x 10" 12mm |
| Special Feature | Portable |
| Sport Type | Cycling |
| Style | U-Lock |
| Suggested Users | Cycling |
| UPC | 720018997962 |
| Warranty Description | Limited Lifetime Warranty |

## Product Details

- **Brand:** Kryptonite
- **Item dimensions L x W x H:** 11.5 x 1.18 x 4.02 inches
- **Lock Type:** U-lock
- **Recommended Uses For Product:** low crime areas.
- **Special Feature:** Portable

## Images

![Kryptonite Keeper Long Shackle 12mm U-Lock Bicycle Lock with FlexFrame-U Bracket - Image 1](https://m.media-amazon.com/images/I/7156JEuPR6L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Lost key for old lock needed replacement
*by M***E on April 21, 2014*

I had a long Kryptonite bike lock but lost one of the set of keys and was not happy with having one key for a lock for my bike. So I ordered this off Amazon because I could not find an affordable long U-lock in my local bike shops, and there are several in the area. I was surprised that I could keep the old U part of the lock and use it with the new locking part. Why would I do such a thing? I had a little trouble getting the plastic part on the new U off and did not want it as I was not going to attach it to my bike. I'm in a city with a lot of bike thefts and so I have a crappy looking bike and three (sometimes 4) locks, I'm not attaching them all to my bike. Ugly bike+3 bike locks*leaving bike outside=Not getting stolen in 10 years. I love the long U lock because I can get it around a parking meter base, the bike frame and sometimes the front wheel. The regular bike locks are too short to get them around whatever I'm attaching the bike to (iron fence, skinny pole, railing, etc) and my frame.

### ⭐⭐⭐⭐⭐ Excellent lock, slightly faulty bracket
*by S***O on June 15, 2017*

This is the third Kryptonite lock I buy and the first Keeper. The lock works perfectly. I have never had any problems with Kryptonite lock in general, and this was not the exception. The lock itself is not as heavy as other, "more secure" locks from Kryptonite, but it seems just as sturdy. I feel safe leaving my bike in a park-and-ride for the whole day. They changed the bracket and it's much easier and straightforward to attach it to the bike, but it has the same problems that that other one had. Mainly, it gets slightly loose over time, not enough to stop being functional, but enough to make it sound like all the screws in the bike are about to fall off. It is a matter of tightening it every so often, or just carry the lock in your backpack like most people do. Not a deal breaker though. Overall, the lock is five stars (the bracket not so, but compared to other brackets out there, it is on par).

### ⭐⭐ Lock/key is hard to operate
*by K***H on July 26, 2025*

The lock is very clumsy and the key to the lock is difficult to work.

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**Shop now:** [https://www.desertcart.sg/products/1646161-kryptonite-keeper-long-shackle-12mm-u-lock-bicycle-lock-flexframe](https://www.desertcart.sg/products/1646161-kryptonite-keeper-long-shackle-12mm-u-lock-bicycle-lock-flexframe)

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-03-02*