|LBS screw-up in wiring my new 5200?||OpusOne|
May 20, 2001 6:16 PM
|My wife and I just bought matching Trek 5200's at a LBS. I just noticed that on my frame they crossed the shifter cables in front of the stem, requiring that they cross them again on the down tube to line them up correctly for the final wiring to the derailers. So now I have two exposed cables that cross each and rub up against one another. It seems like this is dead wrong, and this isn't how my wife's bike is built.
So is it just me or should I have them correct it? I assume I can just wait until my "first tuneup is free" visit where they'll tighten up any cable stretch.
Thanks for any pointers...
|Maybe your wife's bike is the one that's wrong.||Spoke Wrench|
May 20, 2001 6:34 PM
|Actually, whenever I can, I make the shift cables cross under the down tube like on your bike. It allows the housing to make a more gentle curve and not rub so much against the head tube at the front of the bike.|
|Yeah, I thought of that, and that's why I'm asking||OpusOne|
May 20, 2001 6:40 PM
|Given the sample set of two bikes, it's not clear which one is the "wrong" one, or even if there is a "right" or "wrong". It still seems to me like having the cables rub against each other is a recipe for premature wear and tear, but I'll admit that I don't know the answer...|
|re: LBS screw-up in wiring my new 5200?||JohnnyP|
May 20, 2001 8:06 PM
|Yers is wrong. They aren't supposed to cross in front of the stem.How do I know? Cause I build all my bikes.None of them are like that(just checked) and I do nothing wrong.The shop moron built your bike.|
|re: LBS screw-up in wiring my new 5200?||Larry Meade|
May 20, 2001 8:50 PM
|Neither one is wrong. It is merely the preference of the mechanic that built the bike. Some like to cross the cables in front of the the head tube to keep the cables from wearing off the paint on the side of the head tube. There is nothing wrong with this set up and the cables rubbing on each other is really not a problem. They will not wear significantly faster than the other way. The other way while more traditional is not really any better and you do have to put some sort of tape on the side of the head tube to avoid damage to the paint. If both bikes shift well, then don't worry about it and ride them.|
|re: LBS screw-up in wiring my new 5200?||Kevin W|
May 20, 2001 8:53 PM
|Either way is correct. What crossing the cables does, it makes it so the cables don't hit the frame when you shift. On all the bikes I build I cross the cables for that reason. Either way your shifting won't be affected, It is just what you like.
|it's done to prevent cables rubbing head tube....||dave|
May 20, 2001 9:12 PM
|It's common on campy equipped bikes to route the right shift cable to the left cable stop and left shift cable to the right cable stop. The cables then arc away from the head tube, and don't rub the paint off. I set up my Colnago C-40 this way, and it works great.
This routing won't work on all frames though. I wouldn't do it if the cables rub on the under side of the downtube, or the downtube will get scratched up. On my frame, I've placed a short length of clear bikesaver tape on the downtube, in the area where the cable cross, as extra insurance against scratching (even though they don't rub the frame).
|re: LBS screw-up in wiring my new 5200?||Chas|
May 21, 2001 7:57 AM
|Only problem with the crossover cable is it won't work if you use a frame supported repair stand. Otherwise it makes for a cleaner route for the shifter cables. Shifting works fine both ways.|| |