I have been using 26mm tires for the winter since the cold weather in the Northeast US has opened up some pretty big holes and cracks in the roads. I like the extra cushion to smooth out the roads. Apart from the smoother ride, I'm not entirely sure if they are slower. In fact they may be faster for me. I am a larger cyclist at 100-103 kg. The 26mm tires I'm using are not a race tire, but yet they seem to corner well and roll nicely. I'm considering using these in the summer and rotating out my 23's for 25's. Thoughts?