I was told the way I have them aids cooling(tarmac use). Fitting them the other way aids the removal of dirt and debris(off road use).
So was I told a load of crap, have I got to change them?
Edit
Just found this(pic below) on another forum, so maybe they were right?
Unfortunately, that is indeed "a load of crap" relative to your particular disc design, and they are
definitely the wrong way round for your particular groove design/length on a "standard street" vehicle.
If you look closely at the grooves in the "dual alternative fitting" diagram you posted, you'll notice that the grooves run "
full length" from outer to inner braking-surface diameter ... in which case the discs COULD be used either way round (ie trailing OR leading outer-edge spiral) depending on your desired goal.
Whereas the actual discs you're using are ONLY "
three-quarter length" groove across the braking-surface ... in which case (for a "standard street" vehicle) the normal fitment would be with a trailing outer-edge relative to the direction of travel (ie = the opposite of yours at present).
They are SOMETIMES fitted in a leading-edge-spiral direction of travel, but generally on "street race or semi-race" level vehicles (primarily for DRY conditions) as this way can give better "heavy-dab" faster initial braking for corners/bends ... but at the cost of being less effective in the wet AND needing higher/more-regular groove-cleaning + pad maintenance/replacement.
As your discs are currently fitted, I strongly suspect that you are likely to find your brakes will be quite "snatchy" and potentially considerably
less effective than standard discs
in wet weather (= or as we in Scotland technically call it ---> "Every Day" ).
Sorry to be the bearer of bad news, but I really would strongly advise that you refit the discs to give a trailing-outer-edge spiral relative to the direction of travel.
Regards
Bob
