IRC Siren Pro Rise Tires Added To bmxultra.com Gear Calculator.

The free online bmxultra.com Gear Calculator has now been updated to include the IRC Siren Pro Rise tires. a massive thanks to Grant at CTD for measuring them up for us.

We have added:

• 20 x 1.75″
• 20 x 1.90″

About the IRC Siren Pro Rise

World-Class Performance. Rider-Developed.

Developed alongside world-class BMX riders, the SIREN PRO RISE is the ultimate weapon for conquering the world’s toughest racetracks. This revolutionary tire delivers a powerhouse combination of:

• 12% Reduced Rolling Resistance: Blast off the starting gate and maintain blistering speed throughout the race.
• 10% Lighter: The RISE is 10% lighter than the SIREN PRO TLR. Feel the difference with a tire that minimizes weight without sacrificing performance.
• 10% Increased Cornering Force: Carve through corners with confidence and maintain your racing line with unmatched precision.

The winning formula is in the details:

• Center Slick Design: Provides smooth acceleration for explosive starts and minimal rolling resistance for maintaining speed.
• Aggressive Tread Pattern: Generates significant cornering force and assists with precise line tracing.
• Micro-Files: Offer additional grip for confident lane changes and maneuvering.
• Grippy Edges: Bite into the track surface during tight turns for maximum control.
• RBC Compound: Delivers phenomenal grip to keep you glued to the track.
• Available in 2 sizes: 20×1.75 (330g) and 20×1.90 (345g) – Find the perfect fit for your racing style.
• Trusted by IRC Pros Simon Marquart, Rico Bearman, Romain Mahieu, and Alise Willoughby. 

Silence the competition. Rise to the Top. Get Your SIREN PRO RISE Now! 

ABOUT THE BMXULTRA.COM GEAR CALCULATOR

For over two decades we have been committed to providing the best and most comprehensive FREE online BMX Gear Calculator available, keeping it up to date with the latest in BMX racing tires. If you notice any tire options missing be sure to contact us and we will add them as soon as we can.

While all other gear calculators provide you with the Gear Inches or Roll Out for your specific gear, ours provides both in an accurate chart based on your tire of choice, so you can compare multiple gear options with just a single gear selection. You can also store up to 5 tire/gearing combinations for quick reference.

As always we do plan to update the iPhone/iPad app soon to bring it in alignment with the online calculator.

The free web based online calculator works well on any browser and device (Android devices, iPhones, iPads, PCs, laptops, etc) and we encourage everyone to take full advantage of the free calculator.

Check out the updated online version here: bmxultra.com/gear-calculator