SRM Promax BMX
SRM Promax BMX - Image 2

SRM BMX

$1,799.00

Delivery time: 3-4 Weeks

excl. VAT plus Shipping Costs

Delivery time: 3-4 Weeks

Categories: ,

Description

Promax HF‑2 BMX Crankset with SRM Spider Power Meter—Maximum Power, Precision & Performance
Upgrade your BMX setup with the Promax HF‑2 Crankset combined with the SRM Spider PowerMeter—the ultimate solution for riders who demand uncompromising stiffness, world‑class power measurement, and race‑ready reliability. Engineered for explosive gate starts, consistent sprint performance, and long‑term durability, this system delivers industry-leading accuracy in every pedal stroke.

Key Features at a Glance:
  • Promax HF‑2 BMX Crankset —Ultra‑stiff, and designed for the high torque and power transfer of BMX!
  • SRM Spider PowerMeter – Industry‑leading ±1% accuracy for professional‑grade performance tracking
  • Compatible with 4‑bolt BMX chainrings (104 BCD)
  • Magnetless cadence measurement—Reliable data without external cadence magnets
  • Long battery life—up to 100 hours of ride time per charge

Maximum Stiffness for Explosive BMX Power
The Promax HF‑2 crankset is built for riders who push the limits. Its forged‑alloy arms deliver exceptional stiffness, ensuring that every watt you produce goes straight into forward motion—ideal for gate starts, sprints, and high‑torque BMX racing.

SRM Power Accuracy Trusted by Champions
The integrated SRM Spider PM 9 PowerMeter brings world‑renowned precision to your BMX bike. With ±1% accuracy, temperature compensation, and magnetless cadence detection, you get consistent, reliable data whether you’re training or racing.

Our 9th generation is our best PowerMeter yet and takes our proven formula and updates it with modern features. The result is a PowerMeter that is easier to use, even more accurate, even longer-lasting, and has improved connectivity.

Thanks to a combination of angle and torque measurement, the PM9 can now measure with higher accuracy in very low cadence situations, and oval chainrings no longer have an impact on the recorded data. The integrated temperature sensor allows for maximum accuracy in changing conditions. Users can now show L&R balance, as well as combined pedal smoothness. With a total of 8 strain gauges and 16 measurement grids, SRM PowerMeters offer the best measurement accuracy in the industry!

PowerMeter 9 comes with many usability improvements. First is the magnet-less cadence mode, which allows you to use the PowerMeter without any cadence magnet.
PowerMeter 9 can be used with ANT+ and Bluetooth LE. It connects to pretty much any head unit and comes with a mobile app. The app provides you with access to live torque data, battery status information, firmware updates, and much more.

The picture shown is for illustration purposes only. The actual product may vary due to product enhancement.

The Promax HF-2 Crank is a 24 mm BMX crankset.

Bolt Circle Diameter (BCD) – 104mm
Chainline – 43 mm
Q-Factor – 168 mm
Material – Aluminum Crank, Steel Spindle
Weight – 917 g at 175 mm incl. PM9 Spider,
Chainrings sold separately.

Additional information

Accuracy

±1% (PM9)

Bolt Circle Diameter

104 mm / 4 bolts

Chainline

43 mm

Connection

ANT+ (PM7 & PM9), Bluetooth (PM9)

Weight

917 g ( incl. 175 mm cranks, excluding ring)

Runtime

>100h – Rechargeable via magnetic charger

Cadence

Magnetless Cadence (PM9)

Cycling dynamics (PM9)

Combined Pedal Smoothness, Left/Right Balance

Warranty

2 Years

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