25mm to 32mm. Feels sluggish!

the geometry is relaxed, so its not going to ride like a race bike with more traditional geometry. However for an endurance bike the big bottom bracket makes it responsive to power. On the hills I can feel the difference with my upgraded carbon wheels, versus the heavier stock Bontrager alloy wheels. However going uphill the geometry does make it feel a little sluggish compared to a race bike, but going downhill the geometry shines and is confidence inspiring.