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I asked because I recently read a review by Bike Radar that suggested Racing Ralph tubulars weren't suitable for racing at low pressures. This is because of low volume casing. You mentioned the Tracer lacks high volume casing, so naturally I was concerned because I feel comfortable in the low 20s on Tufos and Fangos. It sounds like the casing isn't an issue and I certainly like the tread pattern, I may take another look at these.
3 years ago on Tire Review: Specialized Tracer Cyclocross Tubular, 700x33c
The side wall indicates a recommended PSI of 30-90. Did you get a chance to run these at lower pressures such as 20-25 PSI, and if so, how did they hold up?