Schwalbe G-One Speed Pro 2.35 Review

I've got a couple rides and a race on these tires now. They measure up at just under 60mm (59.5-59.8mm depending on pressure) on 32mm IW wheels. The first thing that comes to mind when riding these, and the main reason to run them, is speed. They are extremely fast. I ran these at Old Man Winter 40 mile and it's wild how efficient they were on the dirt roads north of Boulder. I averaged between 20w and 90w less than everyone I raced with, and a big reason was how fast these tires rolled on pavement, dirt, washboard and the rougher gravel sections.

Grip is also surprisingly good for a slick tire, but very dependent on the pressure. At very low pressure (15-16psi), they grip about as good as my 40mm Terra Speed tires. Optimized for road (around 21psi), the grip is enough to take loose gravel corners in a large group of people without crashing, but is far from fun or confidence inspiring. At a middle ground of around 18-20psi, they grip and roll well on category 1 loose gravel, and are an ideal choice for flat, fast terrain with no switchbacks.

Puncture resistance seems great for the flat road, dirt, and crushed gravel around Boulder. No visible cuts in the tires yet.

So what is the downside? Handling is now terribly slow and heavy. I'm not sure if this is due to the change in bike geometry from running a tire 3mm wider/taller than the maximum recommended width, but the bike went from feeling extremely snappy and agile with 2.25 Thunder Burts (measuring 54-55mm on the same 32mm IW Zipp wheels) to feeling unwieldy and hard to turn. Because of this, it will probably be mostly reserved for a flat race day tire for me, but I think a lot of people will enjoy running this tire as the ultimate all road bike tire.