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One of these stronglight TT chainrings... 110BCD/53t
They have all the shifting ramps etc so that certainly isn't helping. I bought them because I wanted to use my existing 110BCD cranks and I struggled to find any single ring 110BCD/53t chainrings... but that was probably a false economy.
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Q rings? http://www.velotechservices.co.uk/shop/vclose2.asp?prd=200801&cat=259
(obviously you won't get thick thin in 53 though!)
What chainring are you using?