BMX Guide
BMX Maintenance Basics
Check your bolts, chain, tyres, headset and cranks weekly, and give the whole bike a deeper service monthly, to keep a BMX safe and quiet.
Updated 3 min read751 words
A BMX needs a short check every week and a fuller service every month. The weekly check covers loose bolts, chain tension, tyre pressure, headset play, crank tightness and brake pad alignment. The monthly service adds cleaning, lubing and a closer look at the wheels and bearings. Both take little time and catch most problems before they cause a crash.
Tools you need
- Allen keys, usually 4, 5, 6 and 8 mm
- A spanner or socket set for axle nuts and pedals
- A floor pump with a pressure gauge
- Chain lube and a clean rag
- A torque wrench is useful but optional
Weekly checklist
Do these in order. It takes about ten minutes.
- Bolt check. Test every main bolt for tightness: stem bolts, bar clamp, crank bolts, axle nuts, seat clamp, pedals, peg nuts and brake mounts. A bolt should feel firm, not loose. Do not overtighten. Aluminium parts strip easily, so follow the torque number printed on the part if there is one.
- Chain tension and lube. The chain should have a small amount of slack in the middle, about 10 to 15 mm of up and down movement. Wipe it with a rag, add a little lube on each roller, then wipe off the extra. See how to fix a BMX chain.
- Tyre pressure. Use a pump with a gauge and stay within the range printed on the tyre sidewall. See BMX tyre pressure.
- Headset play. Hold the front brake and rock the bike forwards and back. If you feel a clunk at the top or bottom of the head tube, the headset is loose. Lift the front wheel and turn the bars. They should turn smoothly with no notchy feel.
- Crank tightness. Grab each crank arm and push it side to side. There should be no movement. Also spin the cranks and listen for grinding in the bottom bracket.
- Brake pad alignment. Look at the pad where it meets the rim. It should sit square on the braking surface, not touching the tyre, and about 1 to 2 mm from the rim when the lever is released. See brakes.
- Quick scan. Look over the frame and forks for cracks, especially near welds. Check the wheels for loose or broken spokes.
Monthly routine
Once a month, or after a muddy or wet ride, add these jobs:
- Clean the bike. Wipe it down with a damp cloth and mild soap. Avoid blasting water directly into bearings.
- Deep clean the drivetrain. Wipe the chain and sprocket with a degreaser or rag, then lube again.
- Check the wheels. Spin each wheel and watch the rim. A wobble from side to side means it is out of true. Squeeze spokes in pairs. They should feel firm and evenly tight.
- Check hub bearings. Hold the wheel and rock the axle. Play in the hub means worn or loose bearings.
- Grease threads. When you remove pedals or axle bolts, add a thin layer of grease to the threads. Always check which pedal goes on which side. The right pedal tightens clockwise and the left pedal tightens anticlockwise.
- Inspect grips, seat and tyres. Replace tyres that show cracks or flat spots, and grips that are worn through.
- Check cable and brake wear. A frayed cable or thin pad needs replacing before it fails.
Quick reference
| Task | How often | What to look for |
|---|---|---|
| Bolt check | Weekly and after crashes | Loose bolts, stripped heads |
| Chain tension and lube | Weekly | 10 to 15 mm slack, dry or squeaky chain |
| Tyre pressure | Weekly | Within sidewall range |
| Headset play | Weekly | Clunk or notchy steering |
| Crank tightness | Weekly | Side to side movement |
| Brake pads | Weekly | Square contact, even gap |
| Wheel trueness | Monthly | Wobble or loose spokes |
| Hub bearings | Monthly | Play or grinding |
| Full clean | Monthly | Dirt around the chain and bearings |
When to replace parts
- Chain: when it stretches or kinks. See how to fix a BMX chain.
- Tyres: when the tread is worn flat or the sidewall cracks.
- Brake pads: when the grooves are gone.
- Grips: when they feel slick or are split.
- Headset and bottom bracket bearings: when they are rough, loose or noisy after re-adjusting.
After a crash
Check the bike before you ride again. Look for bent bars or forks, a twisted stem, a bent crank arm, a cracked frame or a wheel that rubs the frame. If anything looks bent, replace it. Straightening steel parts weakens them.
Related
Frequently asked questions about BMX Maintenance Basics
How often should I check my BMX bolts?
Check the main bolts weekly, and always after a crash or a heavy session. Parts that take hits, like the stem, cranks, pedals and axle nuts, come loose first.
What is the best chain lube for BMX?
Any bicycle chain lube works. Use a dry or wet lube depending on your conditions, wipe off the extra, and keep it away from the brake pads and rims.
How do I check headset play?
Hold the front brake, rock the bike forwards and back, and feel for a clunk at the headset. Then lift the front wheel and turn the bars. They should move smoothly without notches.
Watch on the LUXBMX YouTube
Videos about BMX Maintenance Basics from the LUXBMX YouTube channel.
Shop at LUXBMX
Popular picks for this article from LUXBMX, an Australian BMX store.
Odyssey Travel Multi ToolView the Odyssey Travel Multi Tool at LUXBMX
Odyssey Chain BreakerView the Odyssey Chain Breaker at LUXBMX
Photos: LUXBMX
BMX Wiki and LUXBMX share an owner. Links to the store are not paid placements and do not change what articles say. About this relationship
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