That's a good point: tyres do work in concert with the suspension, and the load they are carrying.
With cars, they say 'the first quarter of your suspension travel is your tyres.' Dirt bikes of course would have a different ratio.
I spent ages trying to sort the front suspension on my Triumph. Eventually I discovered the tyres I'd been using had stiff sidewalls. Changed to a brand with soft sidewalls, instantly discovered the front end was hammering the tyre, adjusted the suspension to suit... voila! Tyre & suspension working well together, much improved ride.
I've learnt weight has a big impact (pardon the pun) and I don't have much of it. Metzeler and Pirelli sportstouring tyres are way, way too stiff to work well for me, except at stupid low pressures. Hmm, where've we heard that before, maybe that's why I find TKC80s so useless? Michelin and Dunlop make tyres with conforming sidewalls and work really well for me at the recommended pressures.
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