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#21
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Front derailer compatibility issue?
On Mar 25, 12:44*am, Hank Wirtz wrote:
On Mar 24, 7:55*pm, Marty wrote: On Mar 24, 8:48*pm, Marty wrote: On Mar 24, 9:05*am, Hank Wirtz wrote: On Mar 24, 6:59*am, Marty wrote: On Mar 23, 10:50*pm, AMuzi wrote: Marty wrote: On Mar 23, 11:57 am, Hank Wirtz wrote: On Mar 23, 10:12 am, Marty wrote: On Mar 22, 2:08 pm, Marty wrote: On Mar 22, 1:46 pm, AMuzi wrote: Marty wrote: Front derailer compatibility issue? I'm trying to upgrade an old (early 90's) Shimano friction shift system to an indexed system. *It's 7 speed rear and tripple front. The rear is fine, the front is not. This is a bottom pull FD setup (it’s really a “city bike”, not a mountain bike). *Also, it’s Bio-Pace, which I really don’t like, but, it’s my wife’s bike, she likes it, and I don’t want to spend too much to overhaul it. Anyway, when I attached the FD cable and tried to shift, it took a lot of pressure on the shift lever to even move the FD. *When the FD does move, it seems to swing out too much with the amount of shift lever movement. *For example, moving from low (1) to middle (2) causes the FD to move all the way to the big ring. I added slack to the cable, thinking maybe I had it too tight - that helped a little, but even with a lot of slack in there, it still moved too much and still takes what seems to be way to pressure to cause the movement. Chainline seems to be okay: http://www.sheldonbrown.com/chainline.html The above indicates 47.5 to 50mm and I’m at about 49mm.. Do I need a new FD that is compatible with this indexed front shifter? Maybe. First, ensure the gear wire is attached above, not below, the anchor bolt. If that's right, get a newer model changer. AFAIK anything Shimano from 1988-up (BioPace era) is front-click compatible. -- Andrew Muzi * www.yellowjersey.org/ * Open every day since 1 April, 1971- Hide quoted text - - Show quoted text - Hi Andrew and Hank, The original FD and crank/chainrings are Shimano Exage 300 LX (bio- pace), chainrings are 48/38/28. The original shifters are Exage Country SLR (friction). The new shifters are generic Shimano indexing rapid-fire type shifters - very nice actually. *For the front brifter, the thumb lever shifts to a highter gear, the finger lever shifts to lower gears. *The brake levers even have a little tab that you can move to change between V- brakes and cantilever type brakes. * They are similar to this, only mine are brifters: http://harriscyclery.net/itemdetails.cfm?id=2671 The FD cable was attached to the FD bolt to the left-top (non-drive side). I think the new brifters are newer model than the original stuff. -- Marty- Hide quoted text - - Show quoted text - Anybody? *I'm so close to getting this project completed. *Would love to know if anybody has had similar experience with converting FD friction shift to indexed. *I've read some thing on Sheldon's site that would suggest that I may have to upgrade the FD. *Just not sure. Help!!!- Hide quoted text - - Show quoted text - Your Exage 300LX is from after the introduction of Front SIS, so the pull ratio should be OK. Getting a new one will be dicey, too, because of the chainring sizes. Most FDs compatible with your shifters will be 44T max. Like Andy said, I'd mostly suspect that the cable's on the wrong side of the anchor bolt.- Hide quoted text - - Show quoted text - From Sheldon's web pages on FD: "The ratio of cable movement to derailer movement differs with Shimano's "road " vs. "MTB " front derailers. This can cause indexing problems if you use a "road" front derailer with upright handlebars or a "MTB" front derailer with drop handlebars. This is a concern if you are running an indexed front shifter, such as Shimano STI or RapidFire shifters." Is this Exage 300LX a true MTB FD? *Because, what is stated above is exactly what is happening in my case. *There is WAY too much FD movement with the amount of cable movement with this new index shifter. *Now, this would not be an issue with the old friction based shifter. *As stated by Sheldon he "It is not a problem if you are using a friction system, such as bar- end shifters or downtube shifters. It is also not a problem with ratcheting systems such as Campagnolo Ergo." Hmmmm??? Aha! *Get a road front changer -- Andrew Muzi * www.yellowjersey.org/ * Open every day since 1 April, 1971- Hide quoted text - - Show quoted text - By "changer" you mean derailer? -- Marty- Hide quoted text - - Show quoted text - He does. But to be sure what you need, we really need to know the model of your shifter. There's got to be a model number on there somewhere, probably next to the clamp, a number prefixed by "ST-" or "SL-"- Hide quoted text - - Show quoted text - They a Rear: *ST-EF50-7R Front: *ST-EF50-F Looks like this: http://www.mysimon.com/9015-11034_8-42322372.html This will no doubt help in my search for the correct FD! Thanks again. -- Marty- Hide quoted text - - Show quoted text - $9.99 @http://wheelworld.com/itemdetails.cfm?id=4151 Notice that the cable comes up from the BB and then over the top on a pulley like device - then if connects to the attachment bolt. *That is what the directions show as well. *Cold it be that this shifter is compatible with only this type of FD? -- Marty OK, that's definitely going to need a MTB FD. I guess your Exage was working to a different (earlier?) standard. The "pulley" on the one you cite is to allow the cable to come from either direction, to or bottom. The Acera-X likely won't work because your chainrings are too big. The same site has the Tourney FD-CO51, which works with 48t rings, but they only have the 35mm clamp version. Shims are available, and work to varying degrees if your seat tube is smaller, and DIY shims of PVC pipe or other plumbing hardware are often effective. Another option that should work with your shifter is the SRAM 3.0, which is widely available in a 48T version, and includes a shim to work with either 32 or 35mm seat tubes. http://www.jensonusa.com/store/produ...nt+Deraill...- Hide quoted text - - Show quoted text - Where did you see the FD-C051? -- Marty |
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#22
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Front derailer compatibility issue?
Marty wrote:
{10 kbs of old text deleted} Where did you see the FD-C051? Since the subject line concerns front derailleurs, how about TRIMMING?!? Bill "arr-arr" S. |
#23
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Front derailer compatibility issue?
On Mar 25, 10:23*am, Marty wrote:
Where did you see the FD-C051? -- Marty- http://wheelworld.com/itemdetails.cfm?id=6183 |
#24
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Front derailer compatibility issue?
On Mar 25, 11:49*am, "Bill Sornson" wrote:
Marty wrote: {10 kbs of old text deleted} Where did you see the FD-C051? Since the subject line concerns front derailleurs, how about TRIMMING?!? Bill "arr-arr" S. As in to fix simple chain rub? I wish. -- Marty |
#25
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Front derailer compatibility issue?
On Mar 25, 11:53*am, Hank Wirtz wrote:
On Mar 25, 10:23*am, Marty wrote: Where did you see the FD-C051? -- Marty- http://wheelworld.com/itemdetails.cfm?id=6183 Sweet. Thanks again! -- Marty |
#26
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Front derailer compatibility issue?
"Bill Sornson" wrote in message
... Marty wrote: {10 kbs of old text deleted} Where did you see the FD-C051? Since the subject line concerns front derailleurs, how about TRIMMING?!? But Bill, that would be dishonest! |
#27
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Front derailer compatibility issue?
On Mar 25, 12:57*pm, "Clive George" wrote:
But Bill, that would be dishonest! Ah! It was joke. Yea, I don't bother trimming because I'm using Google Groups and it hides the old stuff, so I don't think to expose it and trim. But, that's a good practice for sure. -- Marty |
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