SE Bikes Locket Chain Tensioners
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Stacked official word:
"Your SE Bikes Lockit Chain tensioner is the perfect solution if your chain keeps coming loose. This device has two holes for your wheel axles to go in and a bolt that tensions your chain with ease. The chain tensioner sits in your dropout and with your axle nuts slightly loose you can tighten or loosen each tensioner to keep your wheel center. Tighten up the axle nuts and the set nuts on the bolt and your wheel will stay in place. This is a perfect accessory to add some color or keep your chain tight if you apply heavy pressure on your chain."
Keep your chain properly tensioned and your rear wheel positioned where you want it with the SE Bikes Lockit Chain Tensioners.
Designed for bikes using 3/8" (10mm) rear axles, these lightweight BMX chain tensioners help riders precisely adjust chain tension while helping keep the rear wheel properly positioned in the frame's dropouts.
The Lockit tensioners are CNC machined from 6061-T6 aluminum and feature a simple dual hole, single bolt design. Instead of repeatedly pulling the wheel backward by hand while tightening your axle nuts, the adjustment bolts give you more control over rear wheel positioning and chain tension.
This is especially useful on BMX bikes, Big BMX bikes, wheelie bikes, cruisers, and other compatible single speed bikes where proper chain tension and rear wheel alignment matter.
They're also an easy way to add another detail to a custom bike build, with multiple colors available to coordinate with your hubs, pedals, grips, stem, seat clamp, or other components.
If you're tired of your chain becoming loose or your rear wheel shifting under hard pedaling, SE Bikes Lockit Chain Tensioners provide a simple solution.
Set your chain tension. Center your wheel. Lock your setup down.
Product Use
The SE Bikes Lockit Chain Tensioners are designed to help adjust chain tension and position the rear wheel on compatible bikes with horizontal style dropouts and 3/8" axles.
They can be useful for:
BMX bikes
Big BMX bikes
Wheelie bikes
BMX race bikes
Cruiser BMX bikes
Single speed bikes
SE Bikes builds
Custom BMX builds
Rear wheel alignment
Adjusting chain slack
Keeping consistent chain tension
Positioning a rear wheel in the dropouts
Custom color builds
The tensioners sit at the rear dropout and allow the rider or mechanic to make controlled adjustments to the rear wheel position.
Once the chain tension and wheel position are correct, the rear axle hardware is properly tightened.
Specs:
Axle size: 3/8"
material: aluminum
extras: available in anodized colors
Why BMX Riders Use SE Bikes Lockit Chain Tensioners
Helps Keep the Chain Properly Tensioned
Too much chain slack can create unnecessary chain movement and make the drivetrain feel poorly adjusted.
The Lockit tensioners make it easier to fine tune rear wheel position and achieve the desired chain tension.
Helps Position the Rear Wheel
Chain adjustment isn't only about pulling the wheel backward.
Both sides need to be positioned correctly so the rear wheel sits properly in the frame.
Individual tensioner adjustment helps riders make controlled changes from side to side.
Useful for Hard Pedaling
BMX and Big BMX riders can put considerable force through the drivetrain.
Properly installed chain tensioners can help maintain the desired axle position while the axle nuts provide the primary clamping force.
CNC 6061-T6 Aluminum Construction
The Lockit tensioners are CNC-machined from 6061-T6 aluminum, providing a lightweight component designed specifically for this application.
Custom Color Options
Chain tensioners are small components, but they're visible.
Different color choices allow riders to match or contrast them with other components throughout a custom BMX or Big BMX build.
5 Problems You Can Run Into With Other Chain Tensioners
Poor Axle Fit
A tensioner designed around a different axle size may not properly fit your setup.
The SE Lockit is specifically designed around compatible 3/8" / 10mm axles.
Difficult Chain Adjustment
Trying to pull the rear wheel backward by hand while simultaneously centering it and tightening the axle can make precise adjustment frustrating.
Rear Wheel Positioning Problems
Adjusting one side differently from the other can leave the wheel incorrectly positioned in the frame.
Heavy or Bulky Designs
Some tensioners can add unnecessary bulk to the rear dropout area.
The Lockit uses CNC aluminum construction and weighs approximately 2.5 ounces per pair.
Limited Style Choices
Generic chain tensioners may do the job but offer little choice for riders building a coordinated custom BMX.
SE offers the Lockit in multiple colors.
5 Reasons SE Bikes Lockit Chain Tensioners Stand Out
CNC 6061-T6 Aluminum
The Lockit uses lightweight aluminum rather than a basic stamped design.
Made for 3/8" / 10mm Axles
They're purpose designed for compatible bikes using this common axle size.
Dual Hole, Single Bolt Design
The straightforward design provides controlled chain and rear wheel adjustment without unnecessary complexity.
Multiple Color Options
Choose a color that complements your bike instead of treating the tensioner as purely functional hardware.
Designed for BMX Style Applications
These aren't generic hardware store adjusters. They're purpose built bicycle chain tensioners from SE Bikes for compatible BMX, Big BMX, cruiser, and related setups.
Tired of Your Chain Coming Loose?
You get the chain adjusted.
You tighten the rear wheel.
You ride.
Then you're dealing with chain slack again.
The SE Bikes Lockit Chain Tensioners give you more control over where your rear wheel sits in the dropouts, making it easier to dial in chain tension and rear wheel positioning.
Loosen the axle hardware.
Adjust the tensioners.
Position the wheel.
Set your chain tension.
Secure the rear wheel properly.
Done.
And because they're made from 6061-T6 aluminum, you get a lightweight BMX component available in multiple colors to match your build.
Whether you're riding BMX, Big BMX, a wheelie bike, or a custom SE Bikes build, these small components can make rear-wheel adjustment a whole lot easier.
Stop fighting your rear wheel every time you adjust your chain.
Lock in your setup with SE Bikes Lockit Chain Tensioners.
Why Buy From Stacked BMX Shop?
Stacked BMX Shop specializes in BMX and Big BMX bikes, drivetrain components, chains, sprockets, wheels, hubs, and the small parts that keep your bike properly adjusted.
We don't just want to sell you another part.
We want you to understand what it does, whether it fits your bike, and how it helps your setup.
Dial in your chain. Center your rear wheel. Get back to riding.
Shipping: Shipping is based of your orders weight, dimensions & your location. Ships next business day, excludes weekends & holidays. More shipping info here.
We accept all major credit cards.
Frequently Asked Questions
Q: What are SE Bikes Lockit Chain Tensioners?
A: SE Bikes Lockit Chain Tensioners are adjustable rear wheel tensioners designed for compatible 3/8" axle setups. They help position the rear wheel and make it easier to achieve proper chain tension.
Q: What axle size do SE Bikes Lockit Chain Tensioners fit?
A: They're designed for 3/8" (10mm) axles. Always verify your rear axle size and dropout configuration before purchasing.
Q: What are SE Bikes Lockit Chain Tensioners made from?
A: The Lockit tensioners are made from 6061-T6 aluminum, providing a lightweight component for rear wheel and chain adjustment.
Q: Will SE Bikes Lockit Chain Tensioners fix a loose BMX chain?
A: They can help when chain slack can be corrected by moving the rear wheel within compatible horizontal dropouts. They cannot correct every loose chain problem. A severely stretched chain, incorrect chain length, worn sprocket, worn driver/freewheel, or incompatible frame setup may require additional service or replacement parts.
Q: Do chain tensioners keep the rear BMX wheel from moving?
A: Chain tensioners help position the axle and maintain adjustment, but the rear axle nuts or bolts still need to be properly tightened. The tensioner should not be treated as a substitute for correctly securing the wheel.
Q: Can I use SE Lockit Chain Tensioners on a Big BMX bike?
A: Yes, on compatible Big BMX bikes using the correct 3/8" rear axle and appropriate dropout configuration. Check your exact rear hub and frame before ordering.
Q: Are SE Bikes Lockit Chain Tensioners sold as a pair?
A: Current product specifications list the Lockit tensioners by pair and give a combined weight of approximately 2.5 ounces per pair.
Q: Why do BMX riders use chain tensioners?
A: BMX riders use BMX chain tensioners to make rear wheel positioning and chain adjustment more controlled. They're particularly useful on bikes where hard pedaling or repeated riding can make precise rear wheel positioning important.
Q: How tight should my BMX chain be?
A: Your chain should have enough movement to operate smoothly without excessive slack. It should not be pulled excessively tight, because over tensioning can create unnecessary resistance and load on drivetrain components. Check chain tension through a complete crank rotation because chain tension can vary slightly as the drivetrain rotates.
Q: How do I install SE Bikes Lockit Chain Tensioners?
A: Install them on a compatible 3/8" rear-axle/dropout setup, position the rear wheel, and use the tensioner adjustment to fine tune each side. Once chain tension and wheel position are correct, properly tighten the axle hardware and recheck the adjustment before riding.
