Cinturato Gravel M 45-584 (650 x 45c) Gravel Bike Tire - Gravel-Specific Design for Varied Surfaces - SpeedGRIP Compound for Superior Performance

Update: The tires stretched quite a bit. A digital caliper shows 50mm on the 45s. This expanded the tire to within a few mm of the drive side chain stay— not enough clearance to be safe from potential frame damage.There’s a notion out there that gravel tires are better and faster if they are smooth. I had to get over that sentiment to buy these. But I’m very happy with them. I’m not spinning out like I used to; this would seem to mean more power is being transferred. They also have a center line ridge that I think makes them good and relatively fast on the road. And of course the width and knobs mean shredding trails and fire/logging roads with abandon. Like other tires, tire pressure needs to be dialed in. As far as net speed goes, I can certainly believe they aren’t as aero as a smoother tire. But overall I’m sold.

I use my Cannondale Slate mostly for commuting and training with Conti Contact URBAN tyres; with limited choice on 650b rims these have been both fast and puncture bomb-proof.Now the good weather is here I wanted to use the bike for off-road adventures and decided on the Gravel M for the best flexibility on all surfaces as the UK does have endless smooth gravel tracks.I have used these on two 50km rides on road, hard pack, loose and woody paths and the tyres have blown me away. I only have one set of rims, so I was not looking forward to constantly swapping the tyres on and off when I use the bike for commuting.However, with a little more pressure applicable for just road, these are seriously quick tyres, much faster than their RR results on Bike Rolling Resistance. The reason for this is their pressure to RR curve is very steep, so once you get into the 40-50psi range you have a 14w tyre, not a 25w tyre. This is because the extra pressure allows the tyre to roll just on the thin centre blocks which are closely spaced. There is a distinct lack of road hum you normally get with a nobbly tyre - noise is wasted energy - further proving how fast they are. Comfort is not sacrificed either, because you still have the large volume of tyre, so when you hit a bump or pothole you have a big cushion (not as much as at a lower pressure, but significantly more than a 30/32c road tyre!). Oh, I am also using Schwalbe 26" extra light butyl tubes, but will swap to TPU so I can get some more speed!Needless to say, these are still on my bike and I won't be swapping them out for commuting, just raising the pressures!Well done Pirelli, I am blown away and that is not an easy thing to do!!

Used these for almost a year, no flats, very grippy in loose surfaces. Bought a 50c version for next year.

Very good value