bhkyte

On the subject I will post the outers I use,kelvar coated,teflon linned and cheaper. "Reaction" elite preformance cables.
www.ashimam.com.tw
Only probblem is the cable sometimes goes though the cable ends. So I now add a brass spoke washer to prevent this.
Tough cable need some good cutters. I use these but not sure I remend then yet at price, teflon linners did improve downshifting.

Also make sure telflon coated cables are fitted. As far as I know only Later Bromptons fit as standard (mezzos really need this upgrade as standard).