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Going all the way back to rotor grooves and which way they should point...
I was told today that curved or angled grooves can be used either direction, however, if you put them on so that the inner end of the groove arrives at the pad first then gas and particle removal is more efficient, but if they are put on so that the outer end arrives at the pad first then it will give less pad wear. Pays money and takes choice.
As an anecdote, I was also told that the Lotus Elise S2 had angled grooves, but only has one type of disc fitted (ie forward facing one side and backward facing on the other). Apparently its a bit cheaper!!
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