Tioga Power Block OS20 Race Tyre

Power Block was designed in co-operation with top riders to excel on modern style, hard and fast tracks. A slick centre profile with lightly ribbed cornering tread makes this the fastest BMX tyre in the range.

• UTC rubber compound

• Steel bead

• 60tpi

What Is OS20?

OS20 is NOT 22”. OS20 is 20”, but bigger. There are two wheel sizes in the 20” category – the 20” on Jr/mini bikes which uses the 451mm diameter wheel in narrow widths (for 20-1/8” & 20-3/8” tires), and the conventional 20” which uses the smaller 406mm diameter wheel but in wider widths. OS20 is 451mm wheel diameter in similar widths as 406mm wheels. 

OS20 tyres are not compatible with Jr/Mini sized rims, and OS20 rims are not compatible with Jr/Mini sized tyres. 

Is OS20 Race Legal?

Independently verified, OS20 wheel and tires are within UCI and USA BMX sizing regulations for 20”. 

What Do I Need For OS20?

OS20 specific frame, OS20 specific wheels and tires (including OS20 rim strip and OS20 innertubes) are essential for OS20. Many current front forks made for 20” bikes will work with OS20. 

Why OS20?

OS20 rolls faster and retains greater forward momentum. This is achieved by a few factors.

First, it is well understood that minimising the energy loss from the tire casing's deflection is key to reducing rolling resistance. The tire's sidewall compressing when weight is applied is one example of casing deflection. When compared with 20”, OS20, with its larger diameter and greater air volume, exhibit a smaller proportion of its casing deflecting as it rolls – so smaller casing deflection, less energy loss. 

Second, the shape of the tire's contact patch also affects rolling characteristics. The contact patch the shape of the tread as it meets the ground. OS20 tire's larger air volume creates a different contact patch due to less casing deflection (see above). OS20 tires exhibit a smaller 

footprint resulting in lower rolling resistance. 

Another benefit of smaller casing deflection is being able to maintain more forward momentum. As larger diameter tire casings deflect less when rolling, less energy is wasted in overcoming the casing deflection, thus more forward momentum is maintained. OS20 has potential for higher top-end speed and more efficiently maintains the speed. 

When the difference between first and not is a fraction of a second, OS20 has the potential to be the winning edge. 

Material:

•  60 TPI casing

•  UTC Rubber Compound

•  Wire Bead

Weight:

•  OS20 x 1.85

•  OS20 x 1.60

•  15.17oz; 430g

•  12.27oz; 348g

Also available in lighter folding kevlar version.