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Originally Posted by northey
If they feel hard (if you can't dig a thumbnail in) or the rubber looks hard (sounds funny but I'm sure you know what I'm saying) they may not recover (after heating in the burnout). They can look good again after a few runs but won't work as well.
WE used to use AzNu (or similar) tyre softeners on karts and it worked well but I didn't have any joy using it on drag tyres.
It's a hard call but pick the ones that look the best.
The number of passes itself only matters a little; the number of heat cycles the tyre can handle before it starts to degenerate.
cheers
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Yeh Ive had slicks go off on me, as you mentioned couldnt stick my finger nail in them as much as when they were new, they were over 12 month old and done a decent amount of passs with them. also had tyres go off for copping to much sun light, maybe why MT says to store them in a cool dry place when not in use.