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Best Budget Bike U Locks for Adult Tricycles
Three low cost U locks and what each realistically protects on a wide trike.
Updated · 3 min read · 3 products evaluated
A U lock is the classic way to secure a bike, but a tricycle is wider and bulkier, so the interior opening matters more than on a two wheeler. Budget locks make real compromises, usually in shackle thickness or key quality.
We took the cheaper half of the U locks in our set and compared shackle size, opening and cable length. None is a high security lock, so the goal is deterrence for quick stops rather than overnight street parking.
Short answer
Master Lock 8320D is the best budget choice with a hardened steel body, disc keyed mechanism and a deep 9 inch shackle. Hapleby is the light pick with a 6 foot cable for reaching the wheels. Kryptonite Parkview is compact with a 12 millimeter shackle, but the opening is shallow.
Quick Picks
Our 3 recommendations at a glance. Tap a pick for the full verdict.
Best Light Option
Hapleby U-Lock with 6 Foot Cable
Locking frame and wheels together
Our Picks
Best Overall Budget1 of 3
Master Lock 8320D U-Lock
A hardened steel U lock with a 9 inch shackle and disc keyed mechanism.
Best for
General daytime locking
Why we like it
Master Lock builds the 8320D with a hardened steel body to resist cutting and sawing, a disc keyed mechanism with strong pick resistance and a double locking shackle for pry resistance. The body is 7.25 inches wide with a 9 inch shackle length, and a vinyl coating protects the frame.
That 9 inch depth gives more room than Kryptonite Parkview on a trike frame, and it has a simpler build than the Hapleby with cable. It includes a mounting bracket and two keys. It carries no stated security certification, so treat it as a deterrent.
Key specs
| Size | 7.25 inch body, 9 inch shackle length |
|---|---|
| Features | Disc keyed, double locking shackle, bracket, 2 keys |
Specs can change between model years; confirm the exact version before buying.
Strengths
- Deep 9 inch shackle
- Disc keyed mechanism
- Vinyl coated body
- Bracket and two keys
Limitations
- No cable for wheels
- No stated security rating
Consider it if
- Daytime stops
- Frame to rack locking
Skip it if
- Overnight street parking
Best Light Option2 of 3
Hapleby U-Lock with 6 Foot Cable
A light lock with a 0.55 inch shackle and a long cable for the wheels.
Best for
Locking frame and wheels together
Why we like it
Hapleby has a 0.55 inch solid steel shackle and a thickened 6 foot steel cable, with a mounting bracket, two keys and a dust cover over the keyway. The lock weighs about 1.5 pounds.
The long cable reaches a rear wheel on a trike where Master Lock cannot, but the cable is easy to cut and the shackle reach is shorter. It has no stated security rating, so use it as a convenience lock.
Key specs
| Size | 0.55 inch shackle, about 1.5 lb |
|---|---|
| Features | 6 ft steel cable, bracket, 2 keys, dust cover |
Specs can change between model years; confirm the exact version before buying.
Strengths
- Light at about 1.5 pounds
- 6 foot cable reaches wheels
- Bracket and two keys
- Dust cover on the keyway
Limitations
- Cable is easy to cut
- Shorter shackle reach
- No stated security rating
Consider it if
- Wheel plus frame locking
Skip it if
- High theft areas
Best Compact Pick3 of 3
Kryptonite Parkview U-Lock
A compact 12 millimeter shackle lock with a 4 foot cable and bent foot design.
Best for
Short stops and small frames
Why we like it
Kryptonite Parkview uses a 12 millimeter hardened steel shackle with a bent foot design and a 4 foot braided cable, 8 millimeters thick. The interior opening is 3.25 by 6.25 inches.
It is the most compact of the three and has the thinnest shackle, and the shallow height limits what it can enclose on a wide trike. Measure your frame tube and the post before buying.
Key specs
| Size | Interior 3.25 x 6.25 in |
|---|---|
| Features | 12 mm shackle, bent foot, 8 mm 4 ft cable |
Specs can change between model years; confirm the exact version before buying.
Strengths
- Bent foot design
- Interior 3.25 by 6.25 inches
- 4 foot braided cable
- Lightweight
Limitations
- Thinnest shackle here
- Shallow height
Consider it if
- Quick stops
- Slim tubes and racks
Skip it if
- Thick trike frame tubes
Spec Comparison
Key figures side by side. A dash means the brand gives no figure, so ask before you buy if it matters to you.
| Model | Size | Features | Link |
|---|---|---|---|
| Master Lock 8320D U-Lock Best Overall Budget | 7.25 inch body, 9 inch shackle length | Disc keyed, double locking shackle, bracket, 2 keys | Check price |
| Hapleby U-Lock with 6 Foot Cable Best Light Option | 0.55 inch shackle, about 1.5 lb | 6 ft steel cable, bracket, 2 keys, dust cover | Check price |
| Kryptonite Parkview U-Lock Best Compact Pick | Interior 3.25 x 6.25 in | 12 mm shackle, bent foot, 8 mm 4 ft cable | Check price |
How We Chose These Budget Bike U Locks
- Shackle depth and opening
- We looked at interior opening size first, because a wide trike frame or a thick rack post will not fit inside a shallow U lock.
- Shackle thickness
- Shackle diameter, such as 12 millimeters or 0.55 inch, shows how much cutting resistance a budget lock offers, and none here should be treated as high security.
- Cable and reach
- Where a cable is included, we checked its length and noted that cables are the weaker link, since a trike has three wheels to protect.
- Budget half
- We took the cheaper half of the candidates and compared the mechanism, bracket and keys, since extras like a frame mount make a cheap lock easier to live with.
What to Look for in a Budget Bike U Locks
Interior opening
A U lock only works if the shackle can pass around both the frame and a fixed object. Trike frame tubes are often thicker and wider than a bicycle's.
Measure your frame tube and the post you usually lock to, then compare with the interior size. Master Lock's 9 inch shackle gives more room than the Parkview's 6.25 inches.
Shackle thickness
Thicker steel takes longer to cut or pry. A budget shackle of 12 millimeters or 0.55 inch deters casual thieves but will not stop a determined one with tools.
Read the shackle diameter in the title or description. Use these locks for short daytime stops and move up to a heavier lock for overnight parking.
Cable add on
A cable lets you secure wheels or a seat, but cables cut far more easily than a hardened shackle. Treat the cable as a way to keep casual hands off wheels, not as a theft barrier.
Check cable length against your trike. A 6 foot cable reaches a rear wheel, while a 4 foot cable may stretch to just one.
Keys and mounting
Two keys and a frame bracket make a lock easier to carry and replace. A dust cover keeps the keyway working in wet or dusty weather.
Check what comes in the box. Master Lock and Hapleby include a bracket and two keys, which saves buying a mount later.
How to Choose
By Frame Tube Size
| Situation | Our pick | Why |
|---|---|---|
| Thick frame tubes and wide posts | Master Lock 8320D | Deep 9 inch shackle clears bigger objects |
| Slim tubes and small racks | Kryptonite Parkview | Compact 3.25 by 6.25 inch opening is enough |
| Need to secure a rear wheel too | Hapleby with Cable | 6 foot cable reaches the wheels |
| Lowest carry weight | Hapleby with Cable | About 1.5 pounds |
U Lock vs Cable Lock
- U lock
- Master Lock 8320D relies on a solid hardened steel shackle and disc keyed mechanism, so it resists cutting and picking better than any cable.
- With cable
- Hapleby and Kryptonite Parkview add a cable for wheels, which is useful for convenience but easy to cut.
Use the shackle for the frame and treat the cable as a bonus.
For Short Errands Specifically
- Look for
- A lock that mounts on the frame and goes on quickly, so you actually use it for a five minute stop at a store.
- In this comparison
- Hapleby weighs about 1.5 pounds and includes a bracket, so it is the easiest to carry, while Master Lock adds depth if the frame is thick.
When to Spend More
- Spend more if
- You park outdoors overnight or in an area with known theft, where the thin shackles on Parkview and Hapleby fall short of a heavier lock.
- Save if
- You lock in your garage, at a patio or at a quiet store, where Master Lock 8320D is a reasonable deterrent.
Frequently Asked Questions
Can a budget U lock really protect a tricycle?
It deters casual theft, especially for short daytime stops. None of these three claims a security rating, so a determined thief with tools can defeat them. Pair the lock with parking in a visible spot and avoid overnight use.
Which lock has the most room inside?
Master Lock 8320D has a 9 inch shackle length with a 7.25 inch body, which is the most room here. Kryptonite Parkview has a 3.25 by 6.25 inch opening, so check it against your frame tube first.
Should I trust the cable on the Hapleby?
Use it to keep wheels from being casually taken, not as a theft barrier. Steel cables cut much more easily than a hardened shackle, so the shackle should secure the frame to a fixed post.
How do I lock a three wheel trike with a U lock?
Pass the shackle through the main frame tube and around a fixed post or rack. Rear wheels on a trike are harder to reach, so a cable like Hapleby's 6 foot length can help secure them.
Does a vinyl coating matter?
It keeps the shackle from scratching paint on the frame. Master Lock's vinyl coating does this and also reduces rattle in a bracket. It does not add security against cutting.
Bottom Line
Master Lock 8320D is the best budget U lock for most trike owners because of its deep shackle and disc keyed mechanism. Hapleby is the light choice with a long cable for wheels, and Kryptonite Parkview is compact but shallow. All three are deterrents for daytime stops, not heavy duty locks.