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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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So I need a new front calliper , http://www.chainreactioncycles.com/shimano-tiagra-r451-dual-pivot-brake-calliper/rp-prod74105 was thinking of one of these Shimano Tiagra R451 callipers
but the blurb says that they "Must be used in conjunction with ST-4600, ST-4603, ST-5700, ST-5703, ST-6700 or ST-7900 STIs for correct leverage ratio" is this a money thing or will I be fine just to use the lever I have now ?