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Hello It seems that the stock 52t chainring for a road triple ultegra 9 speed is on back-order or has been discontinued. Is there a replacement that will fit and shift? This is for my wifes Trek and she is not one to be told " Just baby it a little on the up shift " Thanks in advance for any and all help in this matter.

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I can think of two options, neither one perfect. You could look at the Tiagra 4500 series. This is obviously a step down from Ultegra but on the plus side, this range was 9-speed and was current up until a couple of years ago, so you should hopefully still be able to source parts (and they'll be interchangeable with 9-speed Ultegra). Alternatively the 6600 chainrings should fit - it won't be perfect because the 10-speed chain is narrower than the 9-speed chain, but it should be workable. I leave this as a comment in case someone can think of something better. – PeteH Sep 3 '13 at 21:20

You should be able to replace your chainring this with any 9 or 10 speed chainring that is 110 BCD (which is the Bolt Circle Diameter for the spider on an ultegra triple crankset).

Tiagra/105/ultegra replacement rings should all fit, as well as most 3rd party manufacturers replacement rings. Make sure the ring you want to use as a replacement has ramps and pins so that it will work as well as the original. Stick with shimano parts to be sure of the best performance with the ultegra drivetrain.

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According to… , it should be 130mm BCD for outer and middle, 74 mm BCD for inner on a Ultegra 6503 30t/42t/52t triple. So you should need a 52t, 130 bcd 5-bolt chainring. – Batman Apr 28 '14 at 2:50

I had the same problem and found that the 6603-52T, made for the 10-speed Ultegra, works just fine on the 9-speed triple. BCD was 130.

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