Are you also wondering what to do with a bent BMX sprocket?
To fix it or to ditch it?
If I’m brutally honest with you: Ditch it and get a new one.
But let’s be real – no one wants to throw down cash if they don’t have to.
However, sometimes, fixing things isn’t always the smartest move either.
BMX sprockets, regardless of how tough they are made, can bend.
Sure, a 25T one will bend much harder than a 33T one, but they all can.
And likely, we all bent one (or a few!) sprockets in our lives.
That’s OK, it happens.
What to do?
Let’s find out.
This post covers:
- Causes of a bent BMX sprocket
- Inspecting the damage
- Fixing a bent BMX sprocket: pros & cons
- When to replace a bent BMX sprocket
- Preventing future sprocket bends
- Conclusion: replace or fix?
Causes Of A Bent BMX Sprocket
Did your sprocket get like a potato chip?
Okay, I’m a little exaggerating here because it’s nearly impossible to bend a modern sprocket this hard.
But I remember bending the 40T+ sprockets like that back in the day.
One of the main reasons for a bent sprocket is bashing sprockets into a rail or a ledge during grinds.
Either you hit it once really hard or multiple smaller hits – either way, your sprocket can (and will) bend eventually.
That’s why I recommend a guard BMX sprocket if you grind a lot.
But the case that annoys me the most: Riders throwing their bikes around. And it can happen pretty quickly that your bike lands sprocket-first and – BAM – bent sprocket.
Don’t be that stupid to throw your bike around – discipline your mind!
And, let’s not forget, sometimes it’s just down to cheap or poorly made sprockets.
If it wasn’t built tough, it’s gonna bend easier, especially under pressure.
Quality really does matter with sprockets!
Assessing The Damage
So, how bad is it really?
1. How To Check If The Sprocket Is Bent
First, do a visual inspection.
Spin your cranks slowly and watch the sprocket as it goes around.
If it’s wobbling or looks a little off-center, that’s a red flag. (Remove the chain for better visibility.)
Next, check the BMX chain alignment.
When you pedal, if the chain looks like it’s not sitting right or is skipping teeth, your sprocket might be throwing things off.
Finally, listen for abnormal sounds while pedaling.
Hearing weird grinding or clicking noises is a sign that something’s out of place.
But you’ll usually first notice either your chain skipping or something not sounding right. And you’ll then inspect it visually.
2. Determining The Severity Of The Bend
If the wobble is just minor and your chain’s only slightly off, you’re probably dealing with a slight bend.
You might be able to fix or ride with it for a while (especially if you don’t ride your chain super tight, like I do).
But if the sprocket looks like it’s got a major wobble, your chain’s skipping a lot, or things feel off every time you pedal, that’s a significant bend.
In that case, it’s time to think about a replacement.
Fixing A Bent BMX Sprocket: Pros & Cons
The pros and cons I’ve written below will help you decide if it’s better to fix your sprocket instead of dropping cash on a new one.
1. Pros Of Fixing:
First, it’s cost-effective — especially if it’s just a minor bend.
You won’t need to shell out for a new sprocket; with a little elbow grease, you might return it to a usable state.
It’s also a quick temporary solution.
If you’re in a pinch and just want to get back on your bike ASAP, a quick fix might be enough to keep you rolling (for a bit).
How To Fix A Bent BMX Sprocket?
Remember, a rubber mallet is the best way to make the sprocket straight. Don’t use a metal one, or you’ll damage it even more!
2. Cons Of Fixing:
But here’s the downside. Bending it back can (and will) weaken the sprocket’s structure.
You might get it straight now, but it won’t be as strong as before.
There’s a chance it’ll bend again faster. And, very likely, it will, at least from my experience.
You also risk damaging your chain or drivetrain if the sprocket isn’t perfectly aligned.
A bent sprocket can mess with your chain and make your whole setup wear out faster, which could cost more in the long run.
Lastly, even if you fix it, it might not restore perfect alignment.
If it’s still a little off, you’ll feel it when you ride – and that’s just annoying.
When To Replace A Bent BMX Sprocket
Sometimes, no amount of tweaking is gonna save that sprocket. Here’s when you should consider replacing it.
1. Signs It’s Too Damaged For Repair
If the sprocket is bent so bad that your chain keeps slipping, or the wobble is super obvious when you pedal, it’s probably beyond fixing.
Another tell-tale sign?
If you’ve tried bending it back, but it just keeps getting worse, it’s time to call it quits.
2. Why Replacement Is A Better Long-Term Solution
A new sprocket will save you headaches down the road.
Fixing might buy you time, but it’s usually a short-term solution.
A fresh, straight sprocket will keep your drivetrain working smoothly and help avoid bigger issues, like chain wear or worse – snapping mid-ride.
3. Durability & Performance Benefits Of New Sprockets
Plus, let’s be real: new sprockets are better for performance.
They’re more robust, more reliable, and will take a beating longer.
Upgrading also gives you a chance to snag one made from better materials, which will make it less likely to bend in the future.
Long-term, it’s a solid investment for a smoother, safer ride.
Preventing Future Sprocket Bends
Here are my top tips for keeping your sprocket straight for a long time without bending it.
1. Choosing High-Quality, Durable Sprockets
First off, if you’re replacing your sprocket, go for quality.
Higher-end sprockets are built tougher, and while they might cost a bit more, they’re way less likely to bend.
Look for ones made from solid materials like 6061 or 7075 aluminum. They can handle more abuse without giving up on you.
And, like mentioned earlier, consider a sprocket with a guard.
2. Proper Riding Techniques To Reduce Impact
While bending a sprocket happens mostly during grinds, avid grinds where you’re likely to hit your sprocket – if you run one without the guard.
Get a guarded sprocket first and then learn all the grinds, where you’re more likely to bash your sprocket when you miss or slip.
Also, if you do sprocket stalls, try to land straight to minimize the chance of bending it.
3. Routine Maintenance
Lastly, keep up with maintenance.
Check your sprocket regularly to spot any signs of warping early.
A quick look every now and then can save you a lot of trouble later.
Plus, keeping your chain and cranks in good shape means less strain on the sprocket.
It all works together!
Conclusion: Replace Or Fix?
Alright, so here’s the deal.
If your sprocket’s only slightly bent and you just need a quick fix to get back on the bike, you can probably bend it back.
But if the bend is bad, or you’re tired of dealing with a wobbly setup, replacing it is the smarter call.
Usually, I won’t even try fixing my sprocket.
I will ride it for as long as it functions and doesn’t annoy me – this means it’s only slightly bent.
In other words, if the sprocket isn’t messing with my chain, it’s good.
But I’m pretty gentle with my parts, so everything lasts me a long time.
Finally, investing in a quality sprocket is worth it.
You’ll get more durability, better performance, and peace of mind knowing your setup can take the hits.
Spend a bit more now, and you’ll save yourself the hassle (and cost) of constantly fixing things later.
Further reading:
- BMX sprocket maintenance (6 tips!)
- BMX sprocket thickness (does it matter?)
- How BMX sprockets impact grind tricks?
- Best 25T BMX sprockets
- Best 28T BMX sprockets
