Are you 10 or 11 speed? If 10 speed: All Ally cassette. 11-25. 100g. I have one. surprisingly hard wearing too. http://www.ebay.com.au/itm/SeqLite-Shimano-Ultegra-Dura-Ace-10-Speed-Compatible-Alloy-Road-Cassette/162590324911?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D20140106155344%26meid%3Db808821d426c4806a672fdacb7bd81d0%26pid%3D100005%26rk%3D3%26rkt%3D6%26sd%3D161189025713
I did come across those somewhere too. Got a SRAM Red 11sp cassette for good money. It's 180ish grams which is the lightest of the big manufacturers I think.
@Itisaboutthebike started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Are you 10 or 11 speed? If 10 speed: All Ally cassette. 11-25. 100g. I have one. surprisingly hard wearing too.
http://www.ebay.com.au/itm/SeqLite-Shimano-Ultegra-Dura-Ace-10-Speed-Compatible-Alloy-Road-Cassette/162590324911?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D20140106155344%26meid%3Db808821d426c4806a672fdacb7bd81d0%26pid%3D100005%26rk%3D3%26rkt%3D6%26sd%3D161189025713