There’s a good comment on Felix’s site from another user of Air Free Tires:
OK, I put around 200mi on the HP tires. They are:
– much rougher riding than my normal tires @ 90psi (yes, thatâ€™s what I run as I only weigh 140lbs). You can feel every little road imperfection. Not so pleasant.
– considerably higher rolling resistance than my normal tires. Normally I can cruise at 17-18mph without so much effort. To go this fast on the airfree tires required a lot more effort. Iâ€™d say 3mph is taken off your speed, for an equivalent amount of effort.
After these 200mi, I didnâ€™t want to ride my bike anymore with these tires. So Iâ€™m back to my flat-prone Avocet tires, and Iâ€™m taking my lumps with the flats. These airfree tires would probably be OK for short commutes to work, or a couple of miles on bike trails. But in my opinion, thatâ€™s about it.
I’ve logged over a hundred miles on these tires, and I have to agree with the rolling resistance point. I’ve remarked to Rae on several occasions that I’m much more tired during the ride with the Air Free Tires. I was estimating earlier to Felix that I’m losing 1-2 mph with the tires, but maybe George’s estimate of 2-3 mph is more accurate.
I do wonder, however, if the greater resistance of the Air Free Tires is somehow helping me to train better. When the Low-Key Hillclimbs start up again next month, I’ll probably switch back to clinchers. Hopefully, I’ll be flying up the hills instead of trudging up them.