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I don't have 28s, at least not yet, but with 25s I tend to run them at 90psi. More for comfort than for speed, but I can live with losing 1.8 watts as they're not on a bike I race on.
Brommers-
This is for racing. I normally load tyres up at 90-100 psi so that I don't have to worry about reinflating them during an ultra.
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with 25s I tend to run them at 90psi
First time out on the 25C Pro One I went with 75F/90R, and I'm not going to be going up from that even with an all up weight of about 115kg
hippy
gbj_tester
Faster. Note, not fatter.
http://www.bicyclerollingresistance.com/road-bike-reviews/schwalbe-pro-one-tubeless-2016
Rolling Resistance 120 psi / 8.3 Bar 11.0 Watts
Rolling Resistance 100 PSI / 6.9 Bar 11.6 Watts
Rolling Resistance 80 PSI / 5.5 Bar 12.8 Watts
Rolling Resistance 60 PSI / 4.1 Bar 14.8 Watts
Do you run them lower because you can or because if you don't they'll explode in a shower of jizz?