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@chillipepper
life is pretty good. On a geared setup for road racing you'll get 2500miles which is one season. But on a fixed gear with perfect chainline, a thicker ring and no gear change stress can expect 4000 or so miles, doesn't sound much but's a few seasons of TT use so for a dedicated TT bike I reckon it's OK. Besides, no-one makes off the shelf 55T track rings, you have a choice of carbon from fibrelyte or alloy from MDT. The carbon is cheaper...