The answer to that Ian is 'they can't' as previously said there is a huge placebo effect with all changes. For example some swear that 2 seat stays on the brake side is much better because you double the weight transfer to the top of the axle! Utter c*@p! where exactly can this extra weight / mass come from? same driver, same weight. same transfer with 1, 2, 3 or however many stays are fitted. nonetheless drivers report it is better and they go faster, But, have the track conditions changed between the sessions resulting in the improved time? Well yes, the conditions will have changed by virtue of rubber deposits, air temp, track temp and many other things.
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