Upgrade from Tiagra 9 speed to 105 10 speed?

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04housemat

New Member
Hi guys...first post.

I have somehow managed to break my left shifter (doesn't trim anymore) and it now rubs the chain in all gears. Bike currently has complete Tiagra group, I think its the 2010 version.
So I decided instead of replacing with the same, I thought I'd upgrade to 10 speed...and probably 105.
Now obviously, I'd need to buy new shifters, cassette and chain...but will my 9 speed Tiagra front and back derailleurs work with the new kit? And presumably these shifters will work with my Tiagra brakes?
Is it worth the extra £70 for the derailleurs anyway?

Cheers guys.
 
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