Nigel-YZ1
Guru
- Location
- Somewhere else... maybe soon.
Erm... can't remember which side. Just let me go out and look at my bikes 

Left side of the bike for me, and I always think it's odd seeing them on differing sides front and back. Also back one facing into the triangle between the stays, front one pointing to behind the forks.
Having said that I run with locking ones on my main commuter bike - so no lever!
This ^^^.... on a caliper braked bike both QR levers should be on the non-drive side of the bike. Front should be inline with the fork leg, so facing up so as to run no risk of interfering with the spokes. The rear, again on the non-drive side should be facing forward inline with the chain stay. Again to avoid the spokes. .... Gives you a point of leverage with your thumb when opening; the fork leg or chainstay.
I seem to remember reading a long time ago within the "Rules of Cycling" that on a caliper braked bike both QR levers should be on the non-drive side of the bike. Front should be inline with the fork leg, so facing up so as to run no risk of interfering with the spokes. The rear, again on the non-drive side should be facing forward inline with the chain stay. Again to avoid the spokes. Made sense to me and have stuck with it ever since.
I have noticed that this method also gives you a point of leverage with your thumb when opening; the fork leg or chainstay.
My son had a quick release lever loosened in primary school though I put that down to bikes being thrown down next to it possibly. Luckily he had the sense to say it didn't feel right, so a quick stop and it was sorted.This ^^^.
And I'm pernickety about the angles being "just right", so I can see if they've been tampered with.
Ever since some ****** loosened my front QR in a school bike rack. Fortunately, I had a puncture wthin a couple of days. When I lifted the bike to get on the kerb .... the front wheel fell out. Could have been nasty.