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Replacing Sora derailleurs with 105?

Old 10-24-05, 10:10 PM
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Replacing Sora derailleurs with 105?

OK, say the bike I'm working on is... a Trek 1000. (full sora)
Could I replace the front and rear derailleurs with Shimano 105's?
Shifting is made faster with the derailleurs, and 105 front/rear derailleurs aren't very expensive... so why not replace them with a bit of Shimano 105?

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Old 10-25-05, 01:01 AM
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I have Sora and I don't do it because the Sora works. The minute the Sora doesn't work I'll think about it more. I suffer from the same upgrade affliction that most riders do, don't give in to temptation. Could you upgrade? Of course you could. The only problem would be if the bike you're working on is old enough to have shifters that don't match the derailluer you want. Double or tripple? 7sp or 10sp?, etc.
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Old 10-25-05, 01:11 AM
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That's how I see it. I find it rather senseless at my current state to invest in something like a full 105 setup, or ultegra... and if I were crazy enough-- Dura Ace.

I was thinking that the 105 front/rear derailleur would be worth it (as a small upgrade, if current Sora failed, or if you wanted something a bit better for a somewhat low cost) because they shift faster. You'll already be equipped with basic components like the STI Sora shifters, crank, and all that on a stock Trek 1000.

Why doesn't anyone do this instead of spending a load of money for a full 105 setup, or beyond? (Given that you wanted to stick with your frame)
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Old 10-25-05, 02:52 AM
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Originally Posted by ka12na
OK, say the bike I'm working on is... a Trek 1000. (full sora)
Could I replace the front and rear derailleurs with Shimano 105's?
Shifting is made faster with the derailleurs, and 105 front/rear derailleurs aren't very expensive... so why not replace them with a bit of Shimano 105?

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It will work but IMO 105 isn't going to give you enough of a difference over Sora to justify the expenditure. You might want to upgrade the briftes and not the derailleurs though. You will notice a bigger difference in swapping shifters than in derailleurs. If you can score some nice Ultegra shifters sell your Sora and help defray the difference. You can upgrade on the cheap. Good luck

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Old 10-25-05, 05:46 AM
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what he said. if u're gonna upgrade, do the brifters. derailleurs are all the same.

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Old 10-25-05, 07:44 AM
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The 105 derailleurs will be a bit lighter and somewhat nicer looking than Sora but the performance difference, assuming the Sora's aren't worn out, will be minor. Beat the Sora's to death first, then buy the upgrade.

BTW, the Sora shifters work ok too if the release button location doesn't bother you. Some riders don't like them for that reason but functionally they are pretty good. Again, use them until they quit then buy better ones.
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Old 10-25-05, 07:52 AM
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At Performancebike.com right now, you can buy a 105 RD for $25, a 105 FD for $20. Kind of hard to go wrong, really, at those prices.
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Old 10-25-05, 07:54 AM
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^^^^...Add shipping too. Besides it's basically pointless unless the sora stuff is wore out.
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Old 10-25-05, 08:03 AM
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Originally Posted by Coyote2
At Performancebike.com right now, you can buy a 105 RD for $25, a 105 FD for $20. Kind of hard to go wrong, really, at those prices.
These are the 105 9-speed items which are being closed out since 105 is going to 10-speed for 2006. The rear derailleur will certainly work with anything from 7 to 10-speeds so, if you NEED a new derailleur or want a spare, now is a good time to stock up. The FD may work with the new 10-speed components or older 8-speeds but I'd be hesitant to recommend it with anything but 9-speed cranks.

Earlier this year I purchased a 9-speed Ultegra triple crank for $99 since it was "obsolete". Unless you must have the latest thing, these transitions can lead to some real bargains.
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Old 10-25-05, 08:58 AM
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Originally Posted by HillRider
The FD may work with the new 10-speed components or older 8-speeds but I'd be hesitant to recommend it with anything but 9-speed cranks.
105 FD definitely works with 8-speed, no problem; I am using such a setup (Sora brifter w/105 FD).


Originally Posted by HillRider
Earlier this year I purchased a 9-speed Ultegra triple crank for $99 since it was "obsolete". Unless you must have the latest thing, these transitions can lead to some real bargains.
You can definitely find some bargains. Cambria Bike Outfitters has these "Sick Deals", sometimes you can really find some great bargains. Supergo frequently has stuff really cheap too.

But as others have said, it's still probably not "worth" the upgrade if the setup is functioning, just run the Sora into the ground (hard to do, I've found . . . they are fairly tough!). Only reason I replaced my FD is because the cable fixing bolt on the old one broke. If/when the brifters go, I'll probably start looking for Ultegra 9 or maybe used Ultegra 10 to replace them (+ cassette + chain).
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Old 08-22-14, 08:17 PM
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My '13 spec. sectuer f/d (sora) IS effin' up. It chainsucked on me twice. The first time really badly, jammed the chain. the second time enough to put it out of adjustment.

When I study the unit itself, i notice the cage is really thin compared to other models. Also, the stamp runs further down the cage than on the sora.

After they replaced it the first time, I babied it thinking it was me. But it failed again. The rear is fine. But this front d/r can go to hell. Being I have a nine speed casette, will a 105 work? Or should I save my ducketts until I can swap out the whole groupset. And if the g/s is actually 800 bucks, I'l just save for my carbon bike.

Yes I know this thread is old
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Old 08-22-14, 08:52 PM
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Learn how to shift....and get a new mechanic....
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Old 08-24-14, 09:05 AM
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I got a new derailleur...and a new mechanic. Testing today. interesting point he brought up though. Bottom price point bikes sometimes have mismatched parts to save the mfg money. My whole drivetrain is shimano, save the crankset and chain. The tiny difference could be the issue. I'll know more after today's ride.
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Old 08-24-14, 09:29 AM
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Not true, another bad mechanic. Hundreds of thousands of bikes with "mismatched parts" and with Sora front derailleurs are on the road running perfectly fine.
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Old 08-24-14, 04:42 PM
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Well, for now the problem seems handled. Todays 80 miler had no issues and I was all over the drivetrain today.

Thank you for your help, cny-bikeman. I'm going to pass out now.
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