Hi everyone 
               I could do with a rear disc for my K100lt 1990 ABS model their is less the 5mm on mine when i looked at prices i got a bit of a shock! £300 GBP and over! anybody any suggestions where I could find a more sensibly priced one?
Thanks K.

Check this at Motorworks
£156.00 INC VAT

Crazy Frog wrote:Check this at Motorworks
£156.00 INC VAT

Thats a bit more like thanks for that 

dakelvinator wrote:

Crazy Frog wrote:Check this at Motorworks
£156.00 INC VAT

Thats a bit more like thanks for that 

The only thing, I would not use metallic pads with this disk. My brother ordered a brand new EBC + metallic pads and it was scored in less than 100kms.
I believe that these disks are a bit softer than the original stainless steel and this is the reason why they advertise 18% more braking power. If you use the original BMW or the EBC organic pads, you will be OK.
I just received today 3 sets of organic EBC pads ordered on Ebay.
They are 1/2 of the price of the BMW ones, and according to people on this forum, they work as good.

About the thickness of the disk:
I don't think you will lose braking power if the rotors are under the minimum thickness. The only problem that you could encounter is that they may warp easier.
If you don't get any pulse when braking or the rotors are not deeply scored, you should not have to replace the rotors yet.

What is the major cause of warping a rotor?
After braking a lot (particularly in town) the rotors becomes hot. Then you ride in a water puddle and the disk will cool down in a fraction of second creating tension on the metal and warping the disk.

I have been using lots of EBC pads and very happy with them. What is interesting is that in April 2014 I put on a brand new rear disc and new pads,  these pads and 2 subsequent sets of pads have been worn through with new pads last put in during March I think it was. Pads life and rear tyre life seem broadly similar. But the braking is excellent. Disc is still fine and will see maybe another 2 years.

Brake discs run too thin won't spread and dissipate heat there is less metal to absorb braking heat, it all means they will run localised hotter patches and more likely to distort. I have had discs crack due to being too thin, the risk is a disc fracture.