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Best Long Folding Bike Locks for Adult Tricycles
The longer the fold, the more likely it reaches around a trike axle and a post at once.
Updated · 3 min read · 4 products evaluated
Most folding locks are built for a narrow two wheel bike, and their reach shows it. An adult trike is wider and longer, so the useful ones are the folding locks with extra length. The longest option below opens to 43.3 inches, which is a real difference over the usual 33 inch models.
We sorted these four by how far they open, how the links are built and how they carry. None is an automatic fit for every trike, so measure your wheel and post before you buy. For shorter and lighter options see our folding lock guide at /accessories/best-folding-bike-locks-for-tricycles/.
Short answer
The Seatylock Folding Bike Lock opens to 43.3 inches and is the best long choice. The ROCKBROS 4.9 ft lock is the next longest with 4.99mm links. The ICOCOPRO 2.8 ft lock is a light budget pick and the Master Lock folding lock is a simple, widely available option.
Quick Picks
Our 4 recommendations at a glance. Tap a pick for the full verdict.
Best Overall
Seatylock Folding Bike Lock Sold Secure Gold
Large trike frames and outdoor parking
Best Simple Option
Master Lock Hardened Steel Folding Lock
Riders who want a known brand
Our Picks
Best Overall1 of 4
Seatylock Folding Bike Lock Sold Secure Gold
Opens to 43.3 inches, the longest in this group and a real help on wide trikes.
Best for
Large trike frames and outdoor parking
Why we like it
This Seatylock uses 6.5mm hardened steel plates, anti tamper rivets and a guard system for side attacks, and carries an 18/18 Sold Secure Gold level. It opens to a 43.3 inch circumference, comes with a frame mount, and has no cable or chain.
Compared with the ROCKBROS lock, it has thicker plates and more reach, but it is heavier to carry. The extra length is what a trike needs to wrap around an axle and a post. It is a key lock, so keep a spare key.
Key specs
| Size | Opens to 43.3 inch circumference |
|---|---|
| Fit and mounting | Frame mount bracket set |
| Features | 6.5mm hardened plates, Sold Secure Gold, anti tamper rivets |
Specs can change between model years; confirm the exact version before buying.
Strengths
- Longest reach at 43.3 inches
- Thick 6.5mm plates
- Sold Secure Gold level
- Frame mount included
Limitations
- Heavier to carry
- Key only
Consider it if
- Wide trike frames
- Outdoor parking
Skip it if
- Riders who want the lightest carry
Best Mid Length2 of 4
ROCKBROS 4.9 ft Folding Bike Lock
A 4.9 foot lock with 4.99mm links that rotate 360 degrees.
Best for
Awkward posts and angles
Why we like it
The ROCKBROS lock uses thickened 4.99mm alloy steel links with reinforced rivets and a 360 degree rotating folding structure that makes it easy to position. It folds compact and has a frame mounting bracket with straps.
Compared with the Seatylock it is somewhat thinner in plate but flexible around awkward posts. It reaches 4.9 feet, a solid length for a trike, though it is not a certified lock. Use it where theft risk is moderate.
Key specs
| Size | 4.9 ft length |
|---|---|
| Fit and mounting | Mounting bracket and straps |
| Features | 4.99mm alloy links, 360 degree rotation |
Specs can change between model years; confirm the exact version before buying.
Strengths
- 4.9 feet of reach
- 360 degree rotating links
- 4.99mm alloy steel
- Bracket and straps included
Limitations
- No security certification mentioned
- Thinner than the Seatylock
Consider it if
- Awkward posts
- Moderate risk spots
Skip it if
- High theft areas
Best Simple Option3 of 4
Master Lock Hardened Steel Folding Lock
A straightforward folding lock with a vinyl covered body and a lifetime warranty.
Best for
Riders who want a known brand
Why we like it
This Master Lock folding lock uses hardened steel links bound by stainless steel rivets, a vinyl covered body to resist scratches and weather, and a Velcro strapped carrier bracket. It has a limited lifetime warranty.
Compared with the Seatylock and ROCKBROS locks, it gives no length figure, so measure your reach carefully before buying and compare against your post. It is a simple choice for riders who trust the brand. Check the folded size on arrival.
Key specs
| Fit and mounting | Velcro strapped carrier bracket |
|---|---|
| Features | Hardened steel links, stainless rivets, vinyl cover |
Specs can change between model years; confirm the exact version before buying.
Strengths
- Hardened steel links
- Stainless steel rivets
- Vinyl cover protects paint
- Limited lifetime warranty
Limitations
- Length needs checking
- Velcro bracket is less rigid
Consider it if
- Brand loyal buyers
- Painted trike frames
Skip it if
- Wide trikes with a distant post
Best Compact Budget Pick4 of 4
ICOCOPRO 2.8 ft Folding Bike Lock
A light, short folding lock for quick stops.
Best for
Quick daytime stops
Why we like it
This lock has 26 links of thick alloy steel, reaches up to 85 cm and weighs 0.71 kg. It has a copper lock cylinder, three keys and a mounting bracket with screws and straps. Folded it measures 5.2 by 6.7 cm.
Next to the longer Seatylock and ROCKBROS, it is the shortest, so it will struggle around a wide trike frame. It is light and cheap to carry, so it suits quick stops only. Add a chain for longer reach.
Key specs
| Size | 85 cm length, folded 5.2 x 6.7 cm |
|---|---|
| Weight | 0.71 kg |
| Features | 26 alloy links, 3 keys, mounting bracket |
Specs can change between model years; confirm the exact version before buying.
Strengths
- Light at 0.71 kg
- Folds to 5.2 x 6.7 cm
- Three keys included
- Mounting bracket included
Limitations
- Shortest reach in the group
- Not suited to overnight parking
Consider it if
- Quick stops
- Light carry
Skip it if
- Wide trike frames
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 | Fit | Features | Link |
|---|---|---|---|---|
| Seatylock Folding Bike Lock Sold Secure Gold Best Overall | Opens to 43.3 inch circumference | Frame mount bracket set | 6.5mm hardened plates, Sold Secure Gold, anti tamper rivets | Check price |
| ROCKBROS 4.9 ft Folding Bike Lock Best Mid Length | 4.9 ft length | Mounting bracket and straps | 4.99mm alloy links, 360 degree rotation | Check price |
| Master Lock Hardened Steel Folding Lock Best Simple Option | — | Velcro strapped carrier bracket | Hardened steel links, stainless rivets, vinyl cover | Check price |
| ICOCOPRO 2.8 ft Folding Bike Lock Best Compact Budget Pick | 85 cm length, folded 5.2 x 6.7 cm | — | 26 alloy links, 3 keys, mounting bracket | Check price |
How We Chose These Long Folding Locks
- Length first
- We ranked locks by the length they open to, from the Seatylock 43.3 inch circumference to the ICOCOPRO 2.8 ft, since a wide trike frame needs reach.
- Plate and link build
- We compared plate thickness, rivets and security certification, such as the 6.5mm Seatylock plates against 4.99mm ROCKBROS links, because the rivets are where folding locks fail.
- Positioning ease
- Rotating links and bracket quality counted for riders with limited hand strength, since a stiff lock is hard to bend around a trike frame.
- Carry weight
- Weight and folded size were weighed against how often the lock is carried, from the 0.71 kg ICOCOPRO that folds to 5.2 x 6.7 cm to the heavier Seatylock.
What to Look for in a Long Folding Lock
Open length
Open length is the distance the lock spans when fully extended. A folding lock is a chain of rigid plates, so it can only make a loop as large as its open length allows.
Measure your trike's axle, wheel and post path with a tape. Pick a lock with at least 6 inches to spare, such as the Seatylock at 43.3 inches or the ROCKBROS at 4.9 ft.
Plate thickness and rivets
Thicker plates resist cutting and prying, and anti tamper rivets stop attackers from drilling the joints apart. A thin plate or exposed rivet is the weak link in any folding design.
Check plate thickness and any named security level in the product title or bullets. The Seatylock has 6.5mm plates and Sold Secure Gold, while the Master Lock uses stainless rivets.
Link flexibility
Links that rotate easily make it simpler to lock around a trike's frame and an awkward post. A stiff lock forces you to find a straight path.
Try the lock on your trike when it arrives and return it if it will not close around your usual setup. The ROCKBROS links rotate 360 degrees, which helps with angled posts.
Mounting on a trike
A trike has few round tubes, so a bracket may not fit. Straps and brackets also hold the lock rigid on the frame to stop rattling.
Measure the tube you plan to mount it on, or carry the lock in a basket bag instead. The Seatylock has a frame bracket set, and the ROCKBROS includes a bracket and straps.
Folded size and carry
A folded lock still occupies space on the frame or in a bag, and a long lock folds into a heavy bundle. Light locks are easy to bring but give up reach and plate thickness.
Compare folded size and weight with your carrying method. The ICOCOPRO is 0.71 kg and folds to 5.2 x 6.7 cm, while the Seatylock is noted as heavier to carry.
How to Choose
By Reach Needed
| Situation | Our pick | Why |
|---|---|---|
| Wide trike, post some distance away | Seatylock Folding Bike Lock Sold Secure Gold | Opens to a 43.3 inch circumference |
| Awkward or angled posts | ROCKBROS 4.9 ft Folding Bike Lock | 360 degree rotating links reach odd angles |
| Known brand and painted frame | Master Lock Hardened Steel Folding Lock | Vinyl cover and limited lifetime warranty |
| Quick stops, light carry | ICOCOPRO 2.8 ft Folding Bike Lock | 0.71 kg and compact fold |
Certified vs Uncertified
- Certified
- The Seatylock carries a Sold Secure Gold level and 6.5mm hardened plates, a clear signal of tested resistance for outdoor parking.
- Uncertified
- The ROCKBROS, Master Lock and ICOCOPRO do not name a security certification, so judge them by plate or link thickness and the quality of the rivets.
Choose the Seatylock for overnight parking unless weight is a concern.
For Cargo Trikes Specifically
- Look for
- At least 4.9 feet of open length, or a 43 inch circumference, because the frame and rear axle are long and a short lock cannot loop both.
- In this comparison
- The Seatylock at 43.3 inches and the ROCKBROS at 4.9 feet give the best reach, with the Seatylock offering heavier plates and certification.
When to Spend More
- Spend more if
- The trike sits outside overnight. The Seatylock certification, 6.5mm plates and anti tamper rivets justify the cost of a heavier lock and a key-only opening.
- Save if
- You make short daytime stops. The ICOCOPRO at 0.71 kg with three keys is enough, as long as you never leave the trike overnight.
Frequently Asked Questions
How long should a folding lock be for a trike?
Longer than a bike lock, ideally a 43 inch circumference or more. Measure from your parking spot to the post with the trike in place, then add a few inches so the lock does not strain.
Are folding locks as strong as U-locks?
Thick plate models can be strong, but the rivets are the weak point. Look for anti tamper rivets and a named security level, as the Seatylock offers, and treat thin links as a deterrent for short stops.
Can I mount a folding lock on a trike?
If you have a round tube of suitable size, yes. The Seatylock and ROCKBROS include brackets, but a trike has few round tubes, so otherwise carry the lock in a basket bag.
Should I add a chain?
For long reach, yes. A folding lock plus a chain covers frame and wheel. See /accessories/best-long-bike-chain-locks-for-tricycles/ for chain options that add several feet of reach.
Which lock for a first time owner?
The Seatylock for outdoor parking, or the Master Lock if you want a familiar brand. Read /adult-tricycle-locking-and-theft-prevention/ first and check the open length against your frame.
Will a folding lock scratch my frame?
It can. The Master Lock has a vinyl cover that protects paint, but plates and rivets on others can rub where they touch. Fold the lock away from the frame when you ride.
Bottom Line
The Seatylock Folding Bike Lock with its 43.3 inch reach is the best long folding lock for trikes. The ROCKBROS 4.9 ft suits awkward posts, the Master Lock suits a known brand, and the ICOCOPRO suits quick stops. Test the loop on your trike when it arrives.