Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
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Being as the bike as Shimano 600 components fitted, these are probably going to be at most 8 speed, getting handlebar shifters (STI's) is hard due to availability. Currently only Sora is available in 8 speed, but you may find the cost prohibitive. Stem shifters are a option, but you then have the problem of sourcing the clamp, new cables and any other parts you need to fit your stem.
Would look for a bike which already has handlebar shifters fitted, as this will be cheaper in the long run, for will you like them, how many bike do you see without them fitted?
There is also the option of barend shifters, again, not cheap, but cheaper than STI's, and you will need to get the bar rewrapped, which is hard if you have never done it before.