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zmjones_
Thanks, will look at them.
Bicycling rolling resistance is giving me Challenge Strada Bianca Pro HTLR
https://www.bicyclerollingresistance.com/cx-gravel-reviews/challenge-strada-bianca-pro-htlr
Anyone used them?
EDIT - just did some searches back in the thread and they sound positive, and come in 4omm. Might try them.