Used successfully on a shimano 105sc chainset to replace the original 42 tooth.
http://www.ebay.co.uk/itm/221006797604?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1586.l2649
http://www.ebay.co.uk/itm/221006797604?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1586.l2649
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