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I'm a Shimano guy. You can mix and match Dura-ace, Ultegra, 105, Sora, etc. It is very common on the lower end bikes to have 105 front and sora rear.
Ultegra is usually last years Dura-ace. Same with the 105. Usually the BEST price point for "performance" is Ultegra/105. I usually ran Ultegra.
Just make sure you have the right chain. 9-10 (rear gear) is different chain than 8 different than 11.
Honestly, most people run a double up front and 10 in the back. I am 3 years behind mechanically, these days...
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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