There are no complete bikes in BMX 2000. Every bike in your garage is built from parts you’ve unlocked, one per slot, and you can keep several builds (a modern street bike, a race bike, an 80s freestyler) and switch between them. Parts of any line fit together, so an old-school frame can run modern pegs.
Every part has real-world specs and the game rides them: weight and rotating weight, gearing, tire width, pressure, tread and casing, the brake, and frame and fork geometry. The shop sums that up in four traits, each a % against the stock bike, which rides with the default handling. The swings are small on purpose. Finishes and paint are cosmetic.
Trait
What it is
Range in the shop
Biggest gains
Speed
How quickly the bike gets going and how fast it goes under pedal power.Pace, % against the stock bike: 0.6 × acceleration + 0.4 × sprint speed + 0.1 × rolling resistance saved.
−7% to +3%
tires +3% and frames +1%
Pop
How high your hops, bunny hops and pops off lips go.Hop height, % against the stock bike (the bike and 60% of the rider are lifted).
−2% to +2%
frames +2%, forks +1% and rear wheels +1%
Grip
How hard the tires bite before they slide.Tyre grip on hard ground, % against the stock bike.
−3% to +3%
tires +3%
Control
How hard the bike stops and how it answers the bars.Braking and steering, % against the stock bike (their mean).
−3% to +5%
brakes +5% and frames +2%
What goes into them
Acceleration
Drive force over the mass it moves: the rider, the bike and its rims and tyres again, and the gear.
Sprint speed
The speeds the pedals reach: a taller gear (gear inches) a little higher; a gear that spins out (190 rpm short of the sprint) lower.
Hop
Hop height: the rider's work over the bike plus 60% of the rider.
Grip
Tyre width, pressure and tread on hard ground.
Rolling resistance
Tyre pressure, casing and tread (lower rolls further).
Braking
The brake fitted, against brakeless (skids and foot-jams).
Steering
How far the fork turns below the grip limit: a shorter wheelbase (top tube, stays, fork offset) and a steeper head angle turn quicker.