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[feeutfo]

Only advantage I see is an attempt to regain something approaching the original profile.

[Kevin Wood]

It's common to cut tyres for motorsport use. I think in the first instance you can make the tyre work with minimal "bedding in" - i.e. give it a flat profile at the pressure it's working at, and, secondly, if you don't need 8mm of tread (i.e. you're sprinting or hill climbing), taking the tread depth down makes the tread surface more stable and the tyre grips better.

[cem_devecioglu]

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 

yep.. thats a good idea

[cem_devecioglu]

Only advantage I see is an attempt to regain something approaching the original profile.

thats also another factor..

do you know what happens when you cook the meat initially at strong fire.. and than later use a smaller fire..

water inside the meat is blocked by the cooked layer... which is all professional cookers  accepted method..

if you do the mistake to cook the meat slowly from the beginning , it will loose all its water, dry up and will not have any taste..

same is true for tires(not for very old tires).. the tire softening agents (oils) evaporate from the compound at outer surfaces more quickly.. when you clean this layer you will have a better softer compund.. of course this process must be optimized and not done  within frequent invervals..