Rant Bangin 8 Crankset — 175mm, 19mm 8-Spline, Chromoly (Chrome)
This is the Rant Bangin 8 BMX crankset built from heat-treated 4130 chromoly for strength and durability under hard riding.
Designed for park, street, and trail use, the trapezoid tubular arms reduce flex while still offering a grind-friendly surface.
Key Functional Details
- 175mm crank arm length
- Heat-treated 4130 tubular chromoly arms
- Trapezoid arm profile for improved stiffness
- Wrap-welded pedal bosses for added strength
- 8-spline pinch bolt interface
- Includes 19mm x 150mm spindle
- RHD and LHD compatible sprocket bosses
- Weight: approx. 34.5oz
- Single-speed BMX application
Compatibility & Technical Notes
- Designed for BMX frames using 19mm 8-spline bottom bracket systems
- Includes 150mm spindle
- Compatible with RHD and LHD drivetrain setups
- Requires compatible 19mm BMX bottom bracket (not included unless specified)
- NOT compatible with 24mm, 22mm, or 48-spline systems
- NOT intended for geared MTB or road drivetrains
Service / Ownership Context
This is a durable mid-level BMX crankset intended for aggressive riding. Proper torque on pinch bolts and regular inspection are recommended for long-term reliability.
Fit & Use Signals
- Good Fit: BMX park, street, and trail riders running 19mm 8-spline bottom bracket setups.
- Not A Fit: MTB, road, gravel bikes, or riders running 22mm or 24mm spindle systems.
Solid mid-tier BMX crank. 4130 heat-treated chromoly is legit for street and park abuse.
Trapezoid profile stiffens the arm compared to round tubes. Not as high-end as 48-spline setups, but strong enough for most riders.
Biggest mistake customers make: assuming any 19mm crank fits any BB. Needs a 19mm BMX mid or Spanish BB depending on frame. Confirm frame spec first.
Pinch bolt interface must be torqued properly and checked after first few rides. BMX riders don’t always re-check and that’s when arms start creaking.
Wrap-welded pedal bosses are strong but pedal threads still strip if riders cross-thread or don’t grease pedals.
Who this is really for: intermediate BMX riders, park/street/trails, someone upgrading from stock one-piece or entry-level 3-piece cranks.
Who should avoid: serious street riders looking for 48-spline or riders over 220+ lbs who ride hard street daily.
Common failures: loose pinch bolts, worn spindle splines from improper torque, stripped pedal threads.
Mechanic advice: grease spindle splines lightly, torque evenly, use threadlocker on sprocket bolt if applicable, and check torque after break-in.