Hi there. I have a couple of the acs claws 16/18T, i got mine from www.supercycles.co.uk, also they sell them for only £10 + £1 p&p. If you want to get the acs for the front then get the welded version which is available on www.tartybikes.co.uk Or wait and get the tensile £35 they say its a good one Cheers