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@spenceey
Ok so I've been thinking how hard would it be to fit my century with a triple chain ring. Currently the specs are;
Rear Derailleur:Shimano Tiagra GS
Front Derailleur:Shimano
SoraShifters:Shimano Sora Dual Control STI
Chainset:Shimano Sora 50/34
Bottom Bracket:Shimano External
Chain:HG53
Freewheel/Cass:Shimano Cassette 11-25 9sp
Can I just go out, buy this and fit it?
http://www.google.co.uk/products/catalog?hl=en&nord=1&q=shimano+triple+chainset&bav=on.2,or.r_gc.r_pw.&ion=1&biw=1280&bih=909&um=1&ie=UTF-8&tbm=shop&cid=13794478142453669966&sa=X&ei=a47oTYuxEYK6hAeonOmBAQ&ved=0CCsQ8wIwAA
Or do I really need to start looking at front/ rear derailer and shifters, because if I do this might start to get very expensive.