Quick Question?
Is there actually any difference with Shimano calipers, e.g. if a website is selling a 'front' caliper can it be used on the rear?
Ta
EDIT - sorry I should have said hydraulic disk calipers
If you mean road brakes then Yes the bolt is longer on the front to go through your fork than your frame.
I also think it makes a slight dif with disc's too.
Same calipers, different adapter. A 160mm on the rear would be a 180mm on the front.
The actual calipers themselves are identical (apart from XTR).
PM ones are the same, IS mount ones are different, as nickjb says.
IS rear caliper needs a 160mm disc, if you use it on the front it needs a 180mm disc, if you use an IS front caliper on the rear you need a 140mm disc.
You do just mean the caliper and not complete brake setup where hose length would come in to it?
Yes just the caliper