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@BringMeMyFix
@mdcc_tester - I know what you're saying, but I'm not racing much on them anyway, and have gone way faster on butyl vs recent results on latex. They don't seem worth it because I'm carrying butyl spares anyway, due to latex's less forgiving attitude towards sloppy tube changes. If my results were a steady march of improvement, maybe, but no, I've gone faster on the sort of courses I enjoy with 46cm drop bars on 81" fixed / 32h box rims than I have with a disc wheel, deeper front, and aerobars fixed or geared. Due to not liking TTing much, my results are hugely dependent on attitude and conveniently placed riders ahead of me (not drafting, just chasing down). Kit upgrades are pretty moot.
@m.f. - I think with tyres/tubes, there are a number of critical points on the pressure scale (relative to rider weight) where significant changes in handling behaviour occur. A 5psi / 5% difference is enough to leap over/under one of those thresholds, whether it's the one below which you can't ride without bottoming out, or above the one that stops the wheel skipping off the road. Let's not forget a 5% difference in speed or rider weight is a huge fucking difference.