Front Derailleur Question and Search
2378
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1170 days
Anton posted 7 weeks ago.
A clamp on will clamp around the seat tube. A braze on will attach to a bracket that has been brazed (welded) to the down tube during manufacture. Either is fine, but (snif) bike snobs usually demand braze on!
I've got a bunch of parts lying around...I'll look through them this afternoon and get back to you.
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73
Member
610 days
fastdog5 posted 7 weeks ago.
I'm not sure how long you've been looking on ebay, but if you're patient I'd guess something will turn up. My old bike was a 7-speed setup, and I was able to find everything I needed on ebay; sometimes it took a few weeks.
The inside of your existing clamp may be stamped with the size. If not, you can measure your downtube...some guidance from Sheldon Brown's site:
1 1/8" (28.6 mm) clamp on. (This is the traditional, standard type for most road bikes & older MTBs.
1 1/4" (31.8 mm) clamp on for mildly oversized seat tubes.
1 3/8" (34.9 mm) clamp on for oversized seat tubes, common on aluminum frames.
1003
Member
786 days
UFTriGator posted 7 weeks ago.
A lot of the rubbing may just be coming from the fact that you're running a triple. Triples tend to rub more because the front chainrings are further from the center chainline. Which gears rub?
______________________________________________
-Matt
Not fast enough.
158
Member
380 days
krazyfranco posted 7 weeks ago.
UF:
I'd like to run a double (I don't remember the last time I used my small chainring) but the triple is what I have, and I have like 20 dollars in my bank account.
If I am on my middle chainring in front, I can use the 4, maybe 5, largest cogs in rear. The 5th one usually just rubs a little bit. The bottom 3-4 rub a lot, and I don't use them ever. On the big chain ring, I can use pretty much all of the rear cogs, except there is a little rubbing on the smallest cog.
Anton:
Thanks for looking. I'll keep searching e-bay too.
Any thought on components? Would having a sora or tiagra FD be a big deal?
453
Member
338 days
theShiba posted 7 weeks ago.
My GF's bike has a triple in front, and I can get a lot more range than that out of it. Shouldn't a 9-speed front deraileur actually give you more gears without rubbing, esp. if you only have a 9 speed in back?
Do you know how to tune your FD? Make sure you have the limits set properly.... You can also give yourself a little bit more by bending the back-end of the FD a little bit... Not idea, but it sounds like you are on the cheap. But seriously, make sure you have the limit screws set properly before you go looking for new gear.
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1003
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786 days
UFTriGator posted 7 weeks ago.
Franco,
I wanted to make sure that something was wrong before you spent the money a new FD and didn't get any results. That's definitely more rub than you should be getting, but even an 8-speed FD won't get rid of all of the rub. There shouldn't be rubbing at all on your big ring and smallest cog. Loosen your upper limit screw 1/4 turn at a time until it goes away (switch gears between each adjustment to make sure you're getting the full range of the FD).
Shiba,
The 9-speed chain is little thinner IIRC, so the FD would be a little thinner, too. An 8-speed FD would be marginally wider, allowing for a little more room. Another problem would be that I don't think 8-speed STI drivetrains have trim (I could be wrong, though), which would be another way to decrease the rubbing.
______________________________________________
-Matt
Not fast enough.
Hey All-
I'm looking for a used 8-speed triple front derailleur. As it turns out, the used bike I got last year has a 9-speed FD with all other components 8-speed. It really isn't a huge problem (I've ridden for a year now, just avoiding certain gears that rubbed), but I would like to get the proper FD. I've checked e-bay with no success. If anyone has one lying around or has any ideas of where else to look, that would be great.
Also, how can I find out what size I need, and what is the difference between clamp on and brazeon?
Thanks-
Greg