Having owned BMW's for some years I know the OEM brake pads from BMW dealers can prove to be expensive. I was shocked to find that a set of rear pads for my R1200GSA LC were £72

So I looked around for alternatives. I have also done a bit of looking around for the S1000XR, but I have focused more on getting as close to the OEM pads, which of course means Brembo.
The front pads were easy as they are the same pads as in the front of the R1200GSA. The rear pads are not the same as in my GSA but a little bit of looking around soon found the Brembo equivalent.
The Brembo reference for the front pads is 07BB38SA and this is for sintered pads. It might also be listed as 07BB38.84. Brembo recommend these as the standard fitment so I would say these are the same as the ones you would buy from BMW, but without the BMW logo on them.
There are two possibilities for the rear.
The first are listed as a carbon ceramic pad, and these are not sintered. The Brembo reference is 07BB0435. They also list an alternative sintered version as 07BB0483.
I don't know how much the pads will cost from BMW, but if they are the same level as my GSA then they won't be cheap. I have found a supplier in Italy who supplies all sorts of parts and accessories for motorcycles, and their prices are very competitive. They are reliable (in my experience) when it comes to delivery, and it usually only takes 3-4 days from placing the order to getting my parts.
www.carpimoto.itAt the moment their prices for the Brembo brake pads are as follows:
Front 07BB38SA 23.74 euros per pair
Rear 07BB0435 carbon ceramic 16.12 07BB0483 sintered 32.49 euros
They also do the NGK spark plugs for the S1000XR at 7.80 each.
I would imagine the Brembo pads are available in the UK as well, but at least this is a starting point for those looking for replacement pads who want to stick with the OEM compounds but without paying BMW prices.