Shimano Spd

I am switching to a 10 speed system on my bike. Will my old 8 spd Shimano 105 derailliers/crankset work?

I plan to purchase the new Nashbar 10 spd road shifter + chain but do not want too much ‘expense creep’ to kick in.

The derailleur will work, because all Shimano derailleurs use the same pull ratio. You *may* need to change the jockey pulleys, but that’s cheap compared to the entire derailleur. The crankset may not work because the shifters will thrown the derailleur the wrong distance for the new chainring spacing. With only a double to worry about, though, it may still work. The only way to tell for sure would be to try it first.

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