Last week we told you everything we knew about the IRC Siren Comp tires and over the weekend we managed to get the tire specs for the Siren Comp range. The free online bmxultra.com Gear Calculator has now been updated.

For 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 save 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