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  1. #1
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    TREK 1.2 Groupset change-out SORA to ???

    Hi everyone, new here, but the question I have is I currently have a TREK 1.2 with SORA components a 3X8 gearing, and want to know the Minimum equipment I must change to upgrade to a 105 with a 2x10 or 2x11 and what gearing sounds good, I have a choice of 11/28 or 12/24 and a 50/34 or 53/39 upfront? (currently I can out pedal my bike on the downhills) and rarely use my smallest chain ring now. Mostly ride flats max elevation gain on my rides are about 450ft and my average ride is about 20-25 miles. Suggestions, recommendations and Thanks in advance!!

  2. #2
    What the what???
    Reputation: Opus51569's Avatar
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    You'll need:
    105 Front Derailleur
    105 Rear Derailleur
    2X crankset (possibly a new bottom bracket)
    Cassette
    10 or 11sp chain
    Rear wheel/hub for 10sp or 11sp
    Derailleur cables/housing/fiddly bits
    Possibly new bar tape
    All the requisite tools...
    A six-pack of your favorite beer
    A rainy Sunday afternoon

    As for which gearing combo, that depends on how strong a rider you are. Personally, I'd never have a use for a 53t chainring, so I'd go 50/34 with an 11sp cassette in back. But if you're strong, go bigger.
    The Law of Headwinds states: If the ride out is easy... wait.

  3. #3
    tlg
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    Quote Originally Posted by hd72 View Post
    Hi everyone, new here, but the question I have is I currently have a TREK 1.2 with SORA components a 3X8 gearing, and want to know the Minimum equipment I must change to upgrade to a 105 with a 2x10 or 2x11
    Unless you have Mavic wheels, I'm 99% sure your wheels are not 11sp compatible. I would suggest going Tiagra. 2018 Tiagra has a lot of trickle down technology from Ultegra and is still 10sp. It'll be the best bang for your buck.
    https://www.ribblecycles.co.uk/shima...uble-groupset/
    wiggle.com | Shimano Tiagra 4700 10 Speed Groupset | Groupsets and Build-kits

    You could try finding a 105 5700 groupset off ebay. There's always some listed.

    To go 11speed, you're better off just getting a new bike. It's not worth the investment trying to upgrade.

    (currently I can out pedal my bike on the downhills) Mostly ride flats max elevation gain on my rides are about 450ft and my average ride is about 20-25 miles.
    I'd suggest a 52/36 and 11/28
    Custom Di2 & Garmin/GoPro mounts 2013 SuperSix EVO Hi-MOD Team * 2004 Klein Aura V

  4. #4
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
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    Waste of money to upgrade that bike to 11 speed. As tlg posted sell it and buy a new bike.
    I work for some bike racers
    I've got some bikes, some guns,
    and a bunch of skateboards

  5. #5
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    actually to a 2X10 - and thanks everyone!
    Last edited by hd72; 08-08-2018 at 08:12 AM.

  6. #6
    Slowski
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    105 5800 11 speed shifters, cables, brakes, derailleurs, crank, cassette and chain can be had for @ $400. Then like others mentioned, you may have wheel compatibility issues, need bar tape, and other things.

    With 105 spec'ed bikes going for @ $1,000 (may need to look around a bit) you would be better off selling your current bike and getting a new one.

  7. #7
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    Another vote here for a new bike instead... it will cost a bit more but be a much better investment. Pass the Trek on to a rider just getting into the sport by selling it on Craigslist or something and it won't go to waste.

  8. #8
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
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    Quote Originally Posted by hd72 View Post
    actually to a 2X10 - and thanks everyone!
    Why on earth would you upgrade a bike to 10 speed just as things are about to convert to 12?
    I work for some bike racers
    I've got some bikes, some guns,
    and a bunch of skateboards

  9. #9
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    12sp isn't really of any concern to the sub-$1000 bike crowd.

    Quote Originally Posted by cxwrench View Post
    Why on earth would you upgrade a bike to 10 speed just as things are about to convert to 12?

  10. #10
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    COST --Unless you want to cover the difference./

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