Originally Posted by
LucVDE
I've exactly the same rims and just like you 3 years ago hesitating between 25 and 28 for the upcoming tire replacement. What's your experience? Are the 28's really so much better as everyone says? My concern about them is the aero penalty on the rather small rims. Most people who put wider tires have also wider rims than those SLR1's.
It's definitively better for me. Not in terms of performance (I can't tell the difference honestly, it's marginal for us mere humans), but in terms of comfort. The added comfort to me easily outweighs aero penalty (if any, it will be unsubstantial).
I am still using 28mm tires, but I now have different rims (hooked / 21mm internal width). They inflate at 29mm on them. Pressure is a little higher (+5 PSI) too.