Bicycle Mechanics - 8 speed Sora3300 STI versus 9 speed Sora3403/Tiagra4503 FDs
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04-06-11, 06:44 PM
I have two questions that I haven't been able to find a definite answer to.
First, will Sora 3300 triple STI (8 speed) work with later 9 speed series triple Front Derailleurs, i.e., Sora 3403 or Tiagra 4503 in terms of shifting/cable pull?
Second, if it will work, would chain rub then be an issue if I continue to use 8 speed chains? Should I switch to 9 speed chains to avoid chain rub..?
I'm asking because I need to get a replacement for my current 2203 FD that my old Trek 1000 came with. I haven't been too satisfied with its performance so I thought maybe I could upgrade it, but the older 8 speed Sora 3303 and Tiagra 4403 FDs are simply unavailable, around here at least.
But I will stick to a new 2303 FD if you guys think a 9 speed FD would just lead to new problems.
Thanks for any input/help!
04-06-11, 07:10 PM
What is your present FD doing that you don't like? Could an adjustment or luberication solve the problem or is it just worn out? The problem with "upgrading" to a 9sp is that you may get cought up in upgrade wannabe syndrone.
I believe that the 9sp FD can work with an 8sp setup but you have to make the setting of the limiting adjustment screws on the FD proper for your rear cog set up.
If you have the upgrade syndrone, plan any incremental purchases as part of an overall plan or you will be involved in a lot of trial and error and much cost.
No problem with cable pull or actuation ratios with these particular components. There may be a slight difference between 8-speed and 9-speed FD cage width but I doubt that it would even be noticeable. A 9-speed FD will probably work better with your 8-speed components than a 10-speed FD because of the cage width and inside rail depth.
Assuming that your cassette is 8-speed most people will recommend an 8-speed chain, but I think a 9-speed would also work well. The inside dimensions are the same.
04-07-11, 06:27 AM
Many thanks for your replies! jforman, I'm no bicycle mechanic so it could be due to my incompetence, but I found the 2203 really, really difficult to adjust. I have another bike which has Sora 3300 FD (for double) and that is much easier to adjust, to a degree that I think it's not all down to the difference between triple/double front derailleurs. Also, from what I could gather on different forums a lot of people have not been happy with the 2203 FD that came with the old (up till 2005/2006) Trek 1000 triple, and several reviews said they had replaced with Sora 3303 etc. But I hear you about the "upgrade syndrome". It doesn't take a lot of upgrades before you could actually have bought a complete group or new bicycle for the same money or less. Actually, unless replacement parts completely disappear or get as costly as newer generations, I'm planning to stick with 8 speed Shimano forever. :) Al1943, I will try a 4503 FD then, thanks! Something else. I am not sure what happened but when I tried to access the site earlier I was notified that my IP had been banned, so I thought my account had been suspended for some reason (unknown to me) but it appears that I can still log on, just not from my own IP address. Before asking this question I searched the site using Google to find the answer. I don't know if that's what caused my IP to be banned. Is that against the rules? I regret any inconvenience I might have caused. Thanks Lars ----------- Edit to say that I'm sorry for the lack of spacing and paragraphs in the reply but it's due to some restriction on the proxy I used to be able to log in.
I don't know why you had problems with your IP address but if you want to search these forums use the forums' search engines.
04-07-11, 10:58 PM
It should work without any issues, proper adjustment is what you need.
04-08-11, 12:14 PM
I ordered the Tiagra 4500 FD yesterday. I'll report back how it works. ;-)
My IP is allowed again now, but I'm still not sure what the reason for the ban was, maybe it was just a mistake.
Thanks again for all everyone's help!
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