The IRC Formula Pro X-guard is a grippy, hard wearing all weather sort of tyre. It gives up a bit of grip and rolling resistance over the RBCC tyre for added puncture protection. The tyre has a 40x40 TPI puncture protection belt that cover the tyre bead to bead. This makes it a bit heavier but there is nothing better for high mileage riders or those that ride in the filth of a British or northern European winter.
While IRC do not say this in the literature the tyre compound is the same as the RBCC tyre.
The tyre has a latex lining meaning low rolling resistance and the tyre is repairable with normal vulcanising glue and patches, although if anything does get through then a worm will do the trick.
The tyres have high puncture/cut resistance, they grip well in the wet and are capable of very high mileages. Now you know why they are expensive. They got a TCR no.5 rider through to the finish without incident. The rolling resistance is higher than the roadlite or the RBCC tyre but that is what the puncture protection belt does.
25mm tyre 294g real width on 19mm internal width rims 25mm and height 21mm. Rolling resistance is higher than the RBCC model but certainly not high.
Typical mileage for me 85kg and 15kg commuter bike is 8000km for the rear tyre.
28mm tyre 340g real width on 19mm internal width rims 28mm and height 24mm.
Why use tubeless tyres?
Tubeless tyres are simply better tyres well IRC are better tyres. Ride comfort is improved and is tubular like. Due to the lack of an inner tube rolling resistance are improved also lower pressure can be run improving grip. The latex sealant will heal most punctures.
Please read this blog post before buying and check your rim is tubeless tyre compatible (and not just going with the manufacturers claim).
For more detail on living and riding with road tubeless tyres have a read of this.
Consider these products with the tyres