Simon

I tried REDDOT 6 groove in Coupe, good enough, can last up to 60000km
also tried black diamond groove in MR2, not bad.
The best is Pagid groove, not sure if you can get Pagid anymore.

Simon

In our SMD application, no need so many grooves, it reduces the usable brake surface.
6 grooves is enough, also no need to have drill holes, it reduces the rigidity of the disc.

Simon

http://www.needforspeed.co.uk/pa ... &PartType=BRB01
Grooved Black diamond front 20vt GBP167

and... GTR Nelson's friend is the importer of DBA in Hong Kong, he surely can help.

Simon

Cryogenic tempering好似係堅野.真係用黎加強金屬耐用性.
http://www.cryointegrity.com/benefits.html
不過, 迫力唔係由金屬同迫力皮磨擦而產生制動力, 係主要由迫力皮物料bed-in入金屬上, 而由迫力皮同迫力皮粅料互相磨擦.
所以, harden左嘅金屬未必係最有利bed-in迫力皮的.
我唔會推介你用.

Simon

I am using black diamond for AW11. I feel comfortable using them now. $3200 front and rear, 4 disc, including shipping. ok price for disc with such small diameter.