I can’t seem to find pads for them (apart from CRC, but I wanted to compare prices before buying), lots for M525 – are they the same does anyone know please?

They are the same shape as M525. Shimano 525 pads only came in resin where as 575 had a sintered option.

575/525/515 are all the same

Loads on Superstar: http://superstar.tibolts.co.uk/product_info.php?cPath=21&products_id=135

great thanks for help – it was superstars that I was after. Brill

The kevlar ones work well in my 575s. The sintered pads are OK but there’s some shing-shing going on until they bed in, at which point they start to feel a bit wooden.

Neither are as good as the original organic Shimano pads but they wore out very quickly.

Clarkes sintered for me, loads of stopping power and last longer than 5mins in gritty conditions, unlike shimano.

http://www.xcracer.com/shop/viewproduct.php?productid=147