Julian_Boolean wrote: Thu Nov 26, 2020 1:42 pm
What makes you decide the tyres are shagged, I think mine have done 8 or 9 track days and still feel fine.
Wear, profile, and squirrelyness. The first 2 are down to me, the last is down to Mrs Weeksy.
Wear : amount of tread left, the composition of the sides/edges
Profile : tyres go 'out of round' on one side and have a step in them which gives a transition from say 20% to 25% lean and feel a bit wandery because of that.
Squirrelyness : This is down to Mrs Weekys 'feel' out on track, something we've been working on as rider/crew over the last few years. She's getting more used to what she likes and doesn't like in how a bike feels, how it turns, holds lines or indeed 'feels a bit squirrely' at times. I wouldn't go as far as to say she can notice when it's 1psi out, but 5psi she'd 100% notice an issue.
This isn't helped by the fact manufacturers now seem to have daft pressures and a lack of consistency within them. Back in the day you'd have a set of Racetec/SCs and you'd run 29-30 on both front and rear from cold. They'd work fine and everyone was happy.
Nowdays, you measure them hot, either while on the warmers or after a session, running 24-28 on the back hot and 33-37 on the front hot... It makes things more complicated to get right but also can give weird feelings on the first couple of laps if done off the warmers.
But then you'll get another set of rubber and their windows will be completely different.
Add to this the fact that tyres nowdays feel and react completely differently. For example, Racetecs have quite a soft sidewall which means they dig in, squirm and squat a bit under braking for example. The Dunlops have a stiffer sidewall and feel more consistent but arguably lack some 'feel'
I think i babbled on a bit from "they just look fucked"
