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@gbj_tester
Assuming you don't do much shifting from one ring to the other, DuraAce is an unnecessary extravagance
http://highpath.net/cycles/eggs/02.html £71.95 for a 55t solid ring
http://www.fibre-lyte.co.uk/ £81.95 for 55t carbon fibre
Not much of a saving, but either could be made stiffer than the DuraAce, and the fibrelyte would be substantially lighter.
If you want to try a 55, I've got a Stronglight Dural 130pcd in excellent condition (done a couple of 10s on it) you can have for £10 posted. Definitely works with 9-speed chain, not sure about 10-speed - it meshes OK with the 10s KMC on my road bike, but I haven't actually ridden it with a 10s chain.