Primal Bigtube 21
Frame · Mid School line · Primal
The Primal Bigtube 21 is a 1990s–2000s frame from the Mid School line. Fitted to the stock bike on its own, it changes Control by −3%, and weighs 250 g more than the stock frame.
Riding
How traits workAgainst the stock bike with only this part swapped, worked out from its real specs. A whole build is worked out together, so parts don’t simply add up; weight counts.
| SpeedAcceleration and top speed | 0% | ||
|---|---|---|---|
| PopHop height | 0% | ||
| GripTire traction | 0% | ||
| ControlBraking and steering | −3% |
Measured effects what these mean
| Acceleration | −0.3% | ||
|---|---|---|---|
| Sprint speed | — | ||
| Hop | −0.4% | ||
| Grip | — | ||
| Rolling resistance lower is better | — | ||
| Braking | — | ||
| Steering | −5.0% |
Specs
| Material | 4130 chromoly |
|---|---|
| Type | Dirt |
| Retail price | $350 a comparable real part |
| Top tube | 21″ |
| Chainstay | 14″ |
| Head angle | 74° |
| Seat angle | 71° |
| BB height | 11.4″ |
| Standover | 9″ |
| Bottom bracket | American |
| Brake mounts | 990 U-brake |
Construction
- Oversized 1.75" down tube
- Gyro tabs · 990 bosses
How to get it
Reach level 19, then buy it for 625 credits in the BMX shop, Parts › Frame. Once it’s yours it stays usable whatever its level.
Finishes
Painted in the shop’s Paint tab; 52 finishes fit. Cosmetic. All metal finishes.
Starter
- Gloss Blackstarter
- ED Blackstarter
- Flat Blackstarter
- Gloss Whitestarter
- Black Anodisedstarter
- Polishedstarter
By level
- Raw + Clearlevel 2
- Fire Redlevel 2
- Pacific Bluelevel 2
- Show Chromefactory
- Bonelevel 4
- Army Greenlevel 7
- Safety Orangelevel 7
- Teallevel 10
- Mintlevel 10
- Red Anodisedlevel 10
- Blue Anodisedlevel 10
- Trans Bluelevel 12
- Trans Redlevel 12
- Burgundylevel 16
- Hot Pinklevel 19
- Lavenderlevel 19
- Trans Purplelevel 22
- Trans Greenlevel 22
- Neon Yellowlevel 26
- Gold Anodisedlevel 29
- Trans Goldlevel 33
- Oil Slicklevel 45
- Chameleon Fliplevel 57
- Rider-Aged Rustlevel 66
Prestige
- Carbon Weavelevel 78
- Raw Titaniumlevel 82
- Black Chromelevel 86
- Candy Applelevel 88
- Ultravioletlevel 92
- Pearl Whitelevel 95
- 24K Chromelevel 100
Earn-only (15)
- Founder TealStarter pack
- Trick Book GoldFill the Trick Book
- Holo FlipFill the Trick Book
- Podium GoldWin in rooms
- Race SilverWin in rooms
- Platinum FlakeWin Platinum medals
- AuroraEvery 28th check-in
- EmberEvery 28th check-in
- GlacierEvery 28th check-in
- Sunset FadeEvery 28th check-in
- ToxicEvery 28th check-in
- StormEvery 28th check-in
- Veteran BronzeReach its level
- Elite PlasmaReach its level
- Legend GoldReach its level
Other frames
All frames| Part | Line | Level | Price | Speed | Pop | Grip | Control |
|---|---|---|---|---|---|---|---|
 Northbound Loam 21.25Northbound · Pro line |
Pro | 22 | 925 | · | · | · | −3% |
 Knotted Bowlcut 20.5Knotted · Pro line |
Pro | 12 | 675 | · | +1% | · | +1% |
 Knotted Nightcap 20.75Knotted · Pro line |
Pro | 10 gift | — | · | · | · | · |
 Primal Curb ServicePrimal · Mid School line |
Mid School | 29 | 570 | · | · | · | −2% |
 Vortex Pro RacerVortex · Old School line |
Old School | 30 gift | — | · | +1% | · | −3% |
 Urbanite 20.5Urbanite · Basic line |
Basic | 1 | Free | · | · | · | · |
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