My front Tiagra 4600 shifter is toast. It is not a cable problem. Something inside, either a pawl or spring is broken. I want to upgrade to 105 10 speed 5700 shifters, since my Mavic CXP-22 wheels are only 10 speed. Can I use the new 5800 front derailleur, or do I need to stick with 5700 105 front derailleur or the Ultegra 6700 front? I know the indexing is different for 10 vs 11 speed cassettes, but I don't know if the indexing is different for the front shifters between 10 and 11 speed groupsets. Thanks for any advice. It is much cheaper to replace the Tiagra shifters with 105 10 speed.