SX450 vs The Passion — Race Bike or Freestyle Bike?

By Bill Ryan · Founder of Supercross BMX · Former Technical Editor, BMX Plus Magazine · Workshop columnist, GO Magazine · Designer of 8× Bike of the Year race frames · 37+ years in BMX

This is not a question of which frame is better. The SX450 and The Passion do two completely different jobs, and the honest answer is that where you ride decides which one you buy. If your Saturday starts behind a gate, you want the SX450. If it starts at a skatepark, a set of trails, or a pump track, you want The Passion. Answer a couple of questions about how you actually ride and the frame picks itself.

What the SX450 is built to do

The SX450 Bubba Harris Edition is a race frame at $499.95, or $589.95 in Show Chrome. It started out as a cro-mo race frame that evolved from our UL series and quickly became Bubba's go-to bike, which is why his name is on it. It is built in 4130 cro-mo and it is designed around one moment: the gate drops and you have about six seconds to be in front.

Everything about it serves that. Race geometry is long and low so the bike tracks straight while you are standing on the pedals at full sprint. The wheelbase is stretched out so the front end stays planted instead of wandering when you are pulling hard on the bars. It runs Pro through Pro XL and up in Gloss Black, Show Chrome, Racing Red, and Bubba Neon Green.

I will be straight with you about the material, because our own published frame hierarchy already is. Full 4130 cro-mo is the legendary freestyle standard, bombproof and good at soaking up vibration, but heavier and more flexible than alloy at comparable stiffness. Premium air-hardening steels like Reynolds come in lighter than standard cro-mo and still sit above alloy in weight. So the SX450 is not our lightest race platform and was never meant to be. It is a steel race frame for riders who want steel ride quality, real durability, and a price that leaves money for wheels and tires.

What The Passion is built to do

The Passion is $399.95 and it is a freestyle and dirt jump frame. Look at what it is tagged for and you have the whole story: dirt jump, pump track, skate park, trails, street, ride out. It is built to take repeated hard landings, to spin, and to be manualed, grinded, and cased into a lip without complaining.

Freestyle geometry is compact on purpose. Shorter rear end, shorter reach, and a bottom bracket that sits higher relative to the axles. That combination is what lets the bike come around fast in a spin, pop up onto the back wheel without a fight, and stay balanced under you in the air rather than out in front of you. Sizes are called out by wheel size and top tube, like 20" Wheel with a 20.5" top tube, and colors run Matte Stone, Raspberry, Eggplant, Marshmallow, and Hi Vis Yellow.

The geometry difference in plain English

Think of it as two different kinds of stability.

A race frame is stable in a straight line at speed. It is longer front to back, sits lower, and carries a longer rear end. That length is what stops the bike from wagging under you when you are sprinting out of the gate or pedaling through a rhythm section at 30 miles an hour. The trade is that a long, low bike does not want to rotate. It resists coming around, and that is a feature at the track and a problem at the park.

A freestyle frame is stable in the air and on the back wheel. It is shorter in every direction that matters, so it rotates quickly and balances easily. The trade is that the same shortness makes the bike twitchy at sprint speed. Standing up and hammering on a park bike feels busy, and you spend energy keeping it pointed straight that you should be spending on the pedals.

Neither one is a design flaw. They are opposite answers to opposite problems.

Brakes, and what the track actually requires

This is the part people get caught out by, so read it before you buy.

At a USA BMX sanctioned track, a working rear brake is required. Not optional, not "we'll look the other way." You will not pass the practice or gate check without one, and the officials are right to enforce it. Race bikes run one rear brake, cable routed clean along the top tube, and that is the whole system.

Freestyle is a different world. A lot of park and street riders run a gyro, also called a detangler, so the bars can spin all the way around without wrapping the brake cable. Plenty of others run brakeless. Both are normal on a park bike and neither will get you through a race gate check. If you buy a freestyle frame with the intention of racing it, plan on running a rear brake and know that the frame was built assuming you might not.

Gearing splits the same way. Race bikes run tall gearing, usually in the 44 tooth by 16 tooth neighborhood, because the whole point is top speed once you are up and rolling. Freestyle went to short micro drive gearing years back, commonly a 25 tooth sprocket with a 9 tooth driver, because it accelerates fast in a short run-up and tucks the sprocket up out of harm's way on a grind.

Marcus Christopher, X Games gold, and a 20.5" Passion

If you want proof that The Passion is a serious frame and not a second-tier product, here it is. On July 4, 2026, Marcus Christopher won X Games gold in Men's BMX Park at MoonPay X Games Chiba, scoring 1002 on his 20.5" Supercross Passion. He backed it up with silver in Dave Mirra Park Best Trick, where he landed the first flair triple downside tailwhip ever done in competition. Marcus is a Paris 2024 Olympian who finished 4th.

That is what a frame at the highest level of park riding looks like, and it costs $399.95.

Side by side

Three questions and the frame picks itself

1. Where will this bike spend most of its hours? Not where you dream about riding it. Where it will actually be on a Tuesday afternoon. A track means SX450. A park, a set of trails, or a pump track means Passion.

2. Are you lining up at a sanctioned race this year? If yes, the SX450 is the answer and you are running a rear brake either way. If racing is a maybe someday, buy for the riding you are doing now.

3. What is going to break this bike? If the load is pedaling hard and landing flat and fast, that is race duty. If it is casing lips, dropping in, and landing sideways out of a spin, that is freestyle duty. Build for the load you are putting on it.

If you are unsure on size for either frame, the BMX Frame Sizing Chart will get you there. If you want to find out whether there is a track close enough to make racing realistic, use the BMX Track Locator.

What happens if you buy the wrong one

Nothing dangerous. It just makes the sport harder than it needs to be, and it usually shows up as the rider blaming themselves.

Take a race bike to the skatepark and it feels long and lazy. It does not want to spin, the front end sits out ahead of you in the air, and manuals take more effort than they should. Nothing is wrong with the bike. It is doing exactly what a race frame does.

Take a freestyle bike to the gate and you feel it in the first straight. The bike wants to move around under a hard sprint, the short gearing runs out of top end, and with no rear brake you are not getting past the gate check. A good rider on a park bike will still beat a slow rider on a race bike, because riders win races. It is just a longer road than it has to be.

Here is the part I want to be clear about: plenty of people start on whatever bike is in the garage, and that is fine. That is how most of us started. Ride what you have, find out whether you love the track or the park, then buy the right frame once you know the answer.

The answer a lot of riders land on: own both

Some of the best racers I know keep a park bike. On a rest week, a rained-out weekend, or a night when they just want to ride with friends and not train, they go to the skatepark or the trails. It keeps bike handling sharp, it builds air awareness that shows up on race jumps, and it is fun, which is the reason any of us started.

Together the two frames are $899.90, less than a lot of single high-end race frames. If you already own an SX450 and have been eyeing the park, The Passion at $399.95 is an easy call. It works the other direction too. Park riders who add an SX450 tend to find out that gate starts are addictive.

My recommendation

Buy for the riding you are doing right now, not the riding you are imagining.

If you are racing, or you are about to start, buy the SX450 at $499.95. It is a proper race frame at a price that leaves budget for good wheels and tires, and it is one of the few race frames in the category with a factory rider's name on it who actually rides it. Get the rear brake sorted the same day you build it.

If you are riding a park, trails, or a pump track, buy The Passion at $399.95 and do not think twice about it costing less than the race frame. Cheaper does not mean lesser here. It is a frame that won X Games gold this July.

If you genuinely do both, get the one that matches where you spend the most hours first, ride it for a season, then add the other one. That is the order I would do it in myself.

Frequently asked questions

Can I race a Supercross Passion at a USA BMX track?

You can enter on it as long as you fit a working rear brake and the bike passes the track's equipment check. It is not built for it, though. The short geometry moves around under a hard sprint and the micro drive gearing runs out of top end down the straight. It will get you racing this weekend if it is what you own. If you decide you like racing, move to a race frame.

Can I ride the SX450 at the skatepark?

Yes, and people do. It will feel long and slow to rotate, and manuals and spins take more effort than they should. It is not fragile, it is just built to go straight and fast. If the park becomes your main thing, The Passion will make you better faster than any amount of trying harder on a race frame.

Why does the freestyle frame cost less than the race frame?

Different frames, different builds, different job. Price is not a ranking. The Passion at $399.95 is the frame Marcus Christopher won X Games gold on in Chiba in July 2026. The SX450 at $499.95 is a race frame in a race platform with its own build spec. Buy the one that matches your riding, not the one with the bigger number.

Do I need a gyro on The Passion?

Only if you want to run a brake and spin the bars past 360 degrees. A gyro lets the cable stay connected while the bars keep turning. Riders who do not spin bars can run a standard rear brake, and plenty of park riders run brakeless. If you are also going to race the bike, run a normal rear brake and skip the gyro.

Is cro-mo steel a downgrade for racing?

No, it is a different choice. Full 4130 cro-mo is heavier and more flexible than alloy at comparable stiffness, and premium air-hardening steels like Reynolds come in lighter than standard cro-mo while still sitting above alloy in weight. What steel gives back is ride quality and durability at a price that leaves money for the rest of the build. If you want the lightest race weapon we make, that is a different frame and a different budget.

What size should I buy?

The SX450 runs Pro through Pro XL and up. The Passion is sized by wheel size and top tube, like 20" wheel with a 20.5" top tube. Sizing for the two is not interchangeable, because a 20.5" park frame and a 20.5" race frame put you in different positions. Use the BMX Frame Sizing Chart and size for the discipline, not just for height.

My kid wants to race and ride the park. Which do I buy first?

Whichever one matches where you will actually be driving them each week. If there is a track nearby and they want to line up, buy the SX450 and let the park riding happen on it for now. If the local skatepark is the after-school routine, buy The Passion. Kids figure out what they love pretty fast, and by then you will know which second frame to add.