you can also try what we use to use on drag days at avon park...
spray bleach onto tyre treads & good bit of revs dump clutch & light up the tyres bleach sofens the rubber compound & lighting them up (burnout) will remove aprox 1mm tread per 30 seconds, & make them sticky also good for track days too!!
also another way of resoftening rubber is to let tyres down to 20psi & have a short F1 style weive up & down the road that will scrub the tyres on front & heat them up wearing the tread but not to low pressure or ull fk the sidewalls!!
i have also found out that the harder the rubber compound the worse they get when worn, some tyres will do 30k on 1st 3mm tread & only 10k on last 4mm
others will burn the soft 3mm of the tread & go very hard at 4mm & have shite grip & will not wear out but you get pissed off with the grip level u bin them anyway!! (conti are bad for this!!)
tyre manufactures engineer this into there tyres
im sure somebody may post a link on tyre sidewall meanings but if i rem the lower the number the softer the tread... 180 220 240 280 320 360 400 etc etc so worth checking when buying tyres i try to go for a 220 it will have even wear all the way threw tread depth... also traction & temp ratings A AA B etc meaning the running temp tyre will grip at its best etc...
i Dont know of anybody in uk sanding tyres but im sure if u jack both rears in the air & leave in 1st gear on tick over you could use a pad sander on them??
Not as bad as me cutting new tread into a tyre with slick edges with an angle grinder to get another 1000miles outa them
