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How much do you weigh? Regardless I would always go bigger. You're not moving fast enough a lot of the time that aero matters too much and fatter tyres have better rolling resistance and sure as shit last longer when you smash into the 14th pothole on that goat track you've routed along... plus there's comfort it running lower tyre pressures. But it is personal. Try some variations in training.
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Yes, there is a wide range used. Schwalbe Pro One tubeless and Conti GP4000 (tubes) are probably the most common. I've had a tyre failure in a big ride using each of those so won't give any recommendations!
Same with width. I'd guess 25mm probably most common but plenty of 23 and 28mm and a few fatter ones.
Right, slowly getting the lighting and charging side sorted as even if I don't get in this year sure I will another year.
Question re tyre choice. Was watching some of the TCRNO5 YouTube clips last night and seems there was a very wide range of tyres. I guess it's somewhat dependent on route chosen but 25 or 28? And is there a preferred brand? I've always ridden Vittoria or Conti GP 4000Sii