Brake discs... Left & right?

[gmanxiii]

Does it matter? Im looking at some and the OEM ones state left and right, whilst the pattern ones fit both sides. As far as I can see there doesnt seem to be any visible difference in design or the way the OEM ones operate.
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I kills hondas

VFR400NC30 > ZZR600 > CBR600FX > CBR1000rr

[stinkwheel]

Some have non-symetrical, swoopy patterns on the carrier that might look funny if fitted on the wrong side.

Like this one:
https://upload.wikimedia.org/wikipedia/commons/7/74/Disc_brake.jpg
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[gmanxiii]

Would it make a difference to braking performance if you fitted them the wrong way around or had two "right" ones?
____________________
I kills hondas

VFR400NC30 > ZZR600 > CBR600FX > CBR1000rr

[Raffles]

[ian789]

[Phoenix]

It might be relevant on ABS bikes where the ABS ring is on one side. Might also apply to any bikes that have stock discs with directional cooling holes or slots in. Fitting 2 right or left discs that actually have no differences other than cosmetic like stinkwheel's picture wouldn't affect the braking as Raffle's friend suggests, there's no reason it would unless the discs were significantly different in width and then it wouldn't pull but it might wobble, car's pull, either way it isn't relevant here.

If you fit used discs you're supposed to refit them to the same sides so that they travel in the same directin which makes sense due to them being subjected to heating and pressure in one direction you'd be best to keep them running in that same direction. I once bought a used set that weren't marked left or right though so just fitted them and never had an issue, wouldn't expect to though really, maybe if I was riding in the MotoGP it would be a bad idea.

[Pete.]