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Early 90s Cannondale R500 Shimano RSX Set With Shimano Altus Crank?

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Early 90s Cannondale R500 Shimano RSX Set With Shimano Altus Crank?

Old 05-11-15, 10:39 PM
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workingthrewit
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Early 90s Cannondale R500 Shimano RSX Set With Shimano Altus Crank?

Hello everyone. I could really use some help here. My Shimano RSX front derailleur will not go out far enough to reach my 3rd (outer chainring). I have attempted to physically push out two different Shimano RSX front derailleurs to reach the outer chainring to no avail. Is the issue that the person that owned the bike before me put that Shimano Atlus mountain bike crank on a road bike? There is a gap between the crank arm and the frame of about 1/3 of an inch on each side of the bike. Keep in mind the high limit screws were all the way open in both Shimano RSX front derailleurs that I tried. Thanks in advance!

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Old 05-12-15, 12:56 AM
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Is the RSX FD made for a double or a triple crank (they were available both ways)? Double crank RX100 FDs were/are more common. The bottom bracket would have been changed to work with the triple crank, and maybe the bottom bracket that was installed is on the wide side. do you have much clearance between the crankarms and the chainstays? If so, you may be able to get a narrower bottom bracket that would be more compatible with your RX100 crankset.

You could also consider switching to a mountain bike triple FD. Many/most road bikes that came with triples at that time used mountain FDs because of the lack of suitable triple road FDs.
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Old 05-12-15, 03:44 AM
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Thanks for the response. I got a Shimano FD-A410 off EBay that says it's for a triple. That is one of the two that i tried on my bike to no avail. I also ordered a Shimano RSX crank before I made this thread. Is that crank not going to help? I just need a different BB or a MB triple FD?
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Old 05-12-15, 04:19 AM
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Road shifters + front derailleur usually won't work with that Altus MTB triple.

RSX crank should be doable, if the proper length BB is in there
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Old 05-12-15, 04:59 AM
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workingthrewit, Common among touring bikes, if you are using STI, you will need to use a triple FD from a road group with a mountain group's triple crank set. For example, my '96 Cannondale T700 uses a RX100 triple FD. Make sure that the backside of the RSX FD's cage isn't contacting the middle chain ring when shifting to the largest chain ring and that it is indeed a triple FD.

Another issue could be FD height if you have a braze-on style hanger that inhibits lowering the FD enough for the Altus' smaller large chain ring. The RSX crank set will work if it is 30-42-52.

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Old 05-12-15, 07:40 AM
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Originally Posted by LesterOfPuppets View Post
RSX crank should be doable, if the proper length BB is in there
+1 this. What doe the front chainline measure currently? Do you have clearance to use a shorter spindle?
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Old 05-12-15, 11:56 AM
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I'm not sure what I'm supposed to measure for the front chainline. As far as the spindle, I will have to look to see if a shorter one looks like it would cause problems. It was my understanding that the FD-A410 is for a triple, but how can I tell for sure? The front derailleur, when physically pushed all the way out and the high limit screw all the way open, has the largest chainring in the very middle of the FD's cage. I would be happy to get another Shimano RSX FD, but how will I know for sure it's for a triple, not a double? This one was supposedly for a triple. I have not delved into BB or Crank-related bicycle mechanics, yet, but would like to learn and do what it takes to make this work right.
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Old 05-12-15, 12:13 PM
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Super-basic rule of thumb: on a 68mm BB shell, the small ring should be approx lined up with the outer flange of the fixed cup.

I just noticed there's no mention of limit screws in your first post. Have you tried unscrewing the "H" screw some, so see if that allows the front derailleur to travel outboard a little more?
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Old 05-12-15, 12:17 PM
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Originally Posted by LesterOfPuppets View Post
Super-basic rule of thumb: on a 68mm BB shell, the small ring should be approx lined up with the outer flange of the fixed cup.

I just noticed there's no mention of limit screws in your first post. Have you tried unscrewing the "H" screw some, so see if that allows the front derailleur to travel outboard a little more?
Look at the last line.
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Old 05-12-15, 12:29 PM
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Generally speaking, newer (mountain at least) cranks require much shorter spindles than "older" mountain cranks.
I was having the same problem as you and had to swap my 127mm BB for a 113MM BB.

You don't mention "which" Altus crank you have, but look it up in the Shimano tech docs and see what BB THAT crank uses.
https://www.paul-lange.de/service/Su...Chainwheel.php
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Old 05-12-15, 12:40 PM
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My last post states that I unscrewed the high limit screw as much as possible. The FD will only go out as far as the outer chainring being in the middle of the FD cage when pushing the FD all the way out and having the high limit screw unscrewed as much as possible.

I will check to see which Altus it is. However, does that mean it HAS to have the associated BB of that size, or could it be different?

Looking at it, I'm wondering if a shorter spindle is going to be enough to make the difference.

Is there a way for me to know for sure if the FD is a double or triple?
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Old 05-12-15, 01:15 PM
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Originally Posted by workingthrewit View Post
My last post states that I unscrewed the high limit screw as much as possible. The FD will only go out as far as the outer chainring being in the middle of the FD cage when pushing the FD all the way out and having the high limit screw unscrewed as much as possible.

I will check to see which Altus it is. However, does that mean it HAS to have the associated BB of that size, or could it be different?

Looking at it, I'm wondering if a shorter spindle is going to be enough to make the difference.

Is there a way for me to know for sure if the FD is a double or triple?
Triple FDs usually have an inner cage plate that extends well below the outer cage plate, in order to better shift up from the granny ring. There's generally a "stepped" shape to them, too:


VeloBase.com - Component: Shimano FD-A417, RSX

A shorter BB could make all the difference -- you say that there's 1/3" of clearance to the frame, and it sounds like you only need a couple mm. Find out what model Altus crankset you have, and we can help find out which BB it wants.
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Old 05-12-15, 01:45 PM
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Originally Posted by workingthrewit View Post
My last post states that I unscrewed the high limit screw as much as possible. The FD will only go out as far as the outer chainring being in the middle of the FD cage when pushing the FD all the way out and having the high limit screw unscrewed as much as possible.

I will check to see which Altus it is. However, does that mean it HAS to have the associated BB of that size, or could it be different?

Looking at it, I'm wondering if a shorter spindle is going to be enough to make the difference.

Is there a way for me to know for sure if the FD is a double or triple?
Do you want it to work?

IF your BB is a cup type, you could probably reverse the spindle to see if that gets you in the ball park.
Typically the DS is longer than the NDS. Depends on the specific spindle though.
Scroll down a bit to spindle dimensions-
Sheldon Brown's Bottom Bracket Size Database
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Old 05-12-15, 02:19 PM
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Originally Posted by workingthrewit View Post
I'm not sure what I'm supposed to measure for the front chainline.
Measure from the centerline of the seat tube to the center of the middle chainring.
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Old 05-12-15, 03:30 PM
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Thanks everyone for the help!

It is an Altus FC-AT10. I measured the chainline at 50mm. Looking at that page for bottom brackets from Sheldon, I see that the RSX A410 is a double on there. My FD is also an A410. I think the derailleur that was sold to me as a triple, is actually a double. Since I can't find the other model that is the RSX triple on Ebay, what could I use alternatively that will fit? So, do I need a new crank, BB, and FD?

Also, Bill, when I was talking about the Altus and the associated BB having to be the specific size, I meant maybe the guy before me didn't put the right BB with the Altus crank. I wanted to know if it was something that could be messed up or if it was a guaranteed fit. I want to make sure all of it is right.

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Old 05-14-15, 12:09 PM
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Bump. I think we are getting close here. Can anyone assist? I would greatly appreciate it.
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Old 05-14-15, 12:43 PM
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Some pictures of what you have would really help. If it were my bike, I'd remove the crank and BB, check the length on the BB, and order one about 6mm narrower (3mm on each side.) If you're worried about the interface between the crank and BB spindle, everything we're talking about here is the same JIS taper, so it would all fit together the same. HTH...
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Old 05-14-15, 12:45 PM
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You'll want your chainline to be 45mm, most likely.

My 1999 RSX FD seems to be made for double or triple. I'm not sure what it's speccing in degrees, though.


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Old 05-14-15, 12:48 PM
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If it was my bike, I'd get a shimano road triple crankset and corresponding bottom bracket.
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Old 05-14-15, 02:00 PM
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Thanks for the replies, everyone!

Here are some pictures.


As you can see, the FD still needs to come out quite a bit. The limiting screw is open all the way and I'm physically pushing it out as far as it will go in the picture.

I found out the crank I bought is for the newer RSX's, not the older one like I have. I guess the one I bought is the RSX-A417. It has the same chainline, but different bolt pattern and a bigger largest chainring. I don't know if my frame can compensate for the bigger chainring, since I don't have much clearance between the FD and the 700x25c tires I bought. The problem is that I can't find the crank that is made for the associated components and frame I already have on Ebay. Do I have any other crank options? I will just sell the crank I just bought.

Should I just get a different BB for the crank I already have, or will I have some shifting issues? I want to get the right stuff, but I can't find the right crank that I need.
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Old 05-14-15, 02:17 PM
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Weird. Judging by that second picture, you don't have a whole lot of spindle length to lose.
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Old 05-14-15, 06:55 PM
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workingthrewit, Here's what I found at vintagecannondale.com:

-standard 2.8 frame R500 used a 26-36-46 RSX triple
-compact 2.8 frame R500 (650B wheels) used a 32-42-52 RSX triple
-standard 3.0 frame R500 used a 26-36-46 RSX triple

Your FD should look like the one in post 7. FWIW a specific BB model can be available in different spindle lengths.

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Old 05-14-15, 07:00 PM
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Originally Posted by LesterOfPuppets View Post
You'll want your chainline to be 45mm, most likely.

My 1999 RSX FD seems to be made for double or triple. I'm not sure what it's speccing in degrees, though.
Those degree measurements refer to the seat tube/chain stay angle.

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Old 05-14-15, 07:19 PM
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I looked at the FD and it does indeed have stamped on it that it can be used for a double or triple. As far as the chainring setup, it is the Shimano Altus Crank with a 46-36-26 setup. Unfortunately, the Shimano RSX crank I ordered on Ebay a couple days ago has a 52-42-32 setup. I wonder if it will work? I wish I could have found one with the 46-36-26 setup.

It says 2.8 on the side of my frame, so Im guessing I have the first one you named. Do you think the 52-42-32 will work? I just need to figure out my best road to go down.

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Old 05-15-15, 01:54 AM
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Originally Posted by workingthrewit View Post
...Do you think the 52-42-32 will work? I just need to figure out my best road to go down.
The crank set may interfere with the FD's cage (what the chain passes through). Often the FD cage shape is determined by the size of the largest chain ring it is designed to shift. Worth trying before buying a replacement.

Just to be sure, you do have the FD shift cable disconnected from the FD to determine how far outward it can travel, right?

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