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Thread: Crossing Cables under the downtube

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    Default Crossing Cables under the downtube

    so on the kinky thread many say they cross their cables under the downtube, I've never heard of this...

    would someone be so kind to explain the ins/outs and why to do this?

    Thanks,
    Chris
    Life is too short to grow up, go ride a bicycle!

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    Default Re: Crossing Cables under the downtube

    i do it on my cx bikes because
    1. i use campy
    2. i prefer downtube cable routing
    3. this ensures the derailleur housing does not interfere with the exposed cantilever brake cable

    i noticed i do not need to do this on my road bikes
     

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    Default Re: Crossing Cables under the downtube

    Quote Originally Posted by Fourflys View Post
    so on the kinky thread many say they cross their cables under the downtube, I've never heard of this...

    would someone be so kind to explain the ins/outs and why to do this?

    Thanks,
    Chris
    Crossing the cables allows the housing coming from the shifters to pass in front of the head tube, making a more gentle arc around it, which prevents the rubbing/paint removal that occurs around the lower part of the head tube when routed without crossing.
     

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    Default Re: Crossing Cables under the downtube

    Quote Originally Posted by WayneJ View Post
    Crossing the cables allows the housing coming from the shifters to pass in front of the head tube, making a more gentle arc around it, which prevents the rubbing/paint removal that occurs around the lower part of the head tube when routed without crossing.
    ahh, I think I see now... so the right shifter still shifts the rear, you just route it around the headtube so it enters the stop on the non-drive side and then crosses back over under the downtube...

    so where does the crossover usually occur?

    thanks
    Life is too short to grow up, go ride a bicycle!

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    Default Re: Crossing Cables under the downtube

    Quote Originally Posted by Fourflys View Post
    ahh, I think I see now... so the right shifter still shifts the rear, you just route it around the headtube so it enters the stop on the non-drive side and then crosses back over under the downtube...

    so where does the crossover usually occur?

    thanks
    You've got it right. The bare cables usually cross a bit more than mid-way down the underside of the downtube. This arrangement may not be possible with larger tubed bikes.
     

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    Default Re: Crossing Cables under the downtube

    Quote Originally Posted by Fourflys View Post
    ahh, I think I see now... so the right shifter still shifts the rear, you just route it around the headtube so it enters the stop on the non-drive side and then crosses back over under the downtube...

    so where does the crossover usually occur?

    thanks
    The cables cross over each other between the cable stops on the headtube/downtube bosses and where they enter the bottom bracket guide. Depending on the bike, this routing may not be possible. If your headtube/downtube boss is too "high" (think where shifter bosses once sat) then your cables will rub the crap out of your downtube.
     

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    Default Re: Crossing Cables under the downtube

    cool, thanks guys!
    Life is too short to grow up, go ride a bicycle!

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    Default Re: Crossing Cables under the downtube

    Here's a quick photo:

    Untitled by cortezcycles, on Flickr
    steve cortez

    FNG

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    Default Re: Crossing Cables under the downtube

    Also and esp. with short HT bikes doing this can make them less "self centering" when riding slow speeds or no hands.

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    Default Re: Crossing Cables under the downtube

    For those of us on smaller bikes or using shorter stems, it's the only smoooth way to route the cables. Keeps them off the head tube, doesn't interfere with steering (as TT noted) and the cables simply make the cross under the downtube and are back on track to finish running them. Clean and simple.
    Aiming to KICK cancer's butt this time around
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    Default Re: Crossing Cables under the downtube

    so I went to pick my new bike up from my mechanic yesterday (a new Hakkalugi) and was looking at it last night and noticed he set my bike up like this... nice!
    Life is too short to grow up, go ride a bicycle!

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    Default Re: Crossing Cables under the downtube

    Quote Originally Posted by Fourflys View Post
    so I went to pick my new bike up from my mechanic yesterday (a new Hakkalugi) and was looking at it last night and noticed he set my bike up like this... nice!
    Some people say that's the mark of a good mechanic...
     

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    Default Re: Crossing Cables under the downtube

    Quote Originally Posted by alexstar View Post
    Some people say that's the mark of a good mechanic...
    Most manufacturers don't recommend this but some folks dig it. I think it is minor. Some frame makers used to recommend this though, I vaguely remember Cannondale saying to do this on their early bikes.

    I don't know that I would use that as a base line for mechanical skills. :)

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    Default Re: Crossing Cables under the downtube

    I like the way the cable housing looks from the front when you run Campy this way, which I do ;>).

    Btw a rubber cable grommet on the cable closest to the DT will stop the cable from rattling against the DT.
    Frank Beshears

    The gentlest thing in the world
    overcomes the hardest thing in the world.

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    Default Re: Crossing Cables under the downtube

    Quote Originally Posted by alexstar View Post
    Some people say that's the mark of a good mechanic...
    he's considered one of the best in the city... he's actually one of the last mechs in the city that's still trained to work on the Lefty forks... I think it's funny that we have one of the best mechs in the city and an ex-Tour (4x) at the shop I part time at... the funny part is it's a Performance Bike... just goes to show you can't always judge a book...
    Life is too short to grow up, go ride a bicycle!

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    Default Re: Crossing Cables under the downtube

    short bikes/ stems only

    cannondale started the fad on there MTB 's as the head tubes on sub 20" frames were too short , when sti became the rage it transitioned to road bikes down tubes do not need such things

    kline did it internally first
     

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    Default Re: Crossing Cables under the downtube

    Quote Originally Posted by Fourflys View Post
    the funny part is it's a Performance Bike... just goes to show you can't always judge a book...
    I live in a bike town. The two best mechanics I've ever worked with are both from Performance (one of which gave me an overly detailed, half hour explanation/execution of a race tuned rear DR adjustment). Most of the other tattooed greasy freaks just look at folks like they are idiots.
     

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    Default Re: Crossing Cables under the downtube

    Quote Originally Posted by alexstar View Post
    Some people say that's the mark of a good mechanic...
    I would say it shows someone's thinking about what's going on and trying to make things better.

    Also, if you heat up a spoke you can re-shape the little plastic thingy under the BB to align to this type of cable routing better...it's the little things.

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    Default Re: Crossing Cables under the downtube

    Quote Originally Posted by WayneJ View Post
    Crossing the cables allows the housing coming from the shifters to pass in front of the head tube, making a more gentle arc around it, which prevents the rubbing/paint removal that occurs around the lower part of the head tube when routed without crossing.
    This is one reason

    Quote Originally Posted by Too Tall View Post
    Also and esp. with short HT bikes doing this can make them less "self centering" when riding slow speeds or no hands.
    Yup, see below

    Quote Originally Posted by SpeedyChix View Post
    For those of us on smaller bikes or using shorter stems, it's the only smoooth way to route the cables. Keeps them off the head tube, doesn't interfere with steering (as TT noted) and the cables simply make the cross under the downtube and are back on track to finish running them. Clean and simple.
    Indeed on small HT/small size frames to cross the wires under the DT may be the only option. As sometimes, on the same small frames, is to have the Fr brake on Lh lever.

    There is however an important thing to note, and is the position of the cable stops on the DT. When they are too close to the HT, if not on the HT itself, this may leave very little room for the cables and it may be necessary to have the cables leaving the handlebars a good 7-9cm to give them a bit more room.
    Is also important how the wires would reach the BB shell, as said the DT/HT cable stops may give a routing that would lead the wires to touch and rub against the underside of the DT. This can be solved by using a tall BB cable guide (like the ones the Specialized uses on their commuter models), although cannot be used on BB lugs with integrated cable-guides.

    I do like the position of the cable stops on the DT that Pego has chosen.
    Makes a lot of sense to me, as it leaves plenty of room to the cables between the point they leave the bars and they reach the frame. This makes for less movement of the cables, which in turns makes for better shifting.
    Andrea "Gattonero" Cattolico, head mechanic @Condor Cycles London


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    vuolsi coś colà dove si puote
    cị che si vuole, e più non dimandare"

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    Default Re: Crossing Cables under the downtube

    Quote Originally Posted by Gattonero View Post
    There is however an important thing to note, and is the position of the cable stops on the DT. When they are too close to the HT, if not on the HT itself, this may leave very little room for the cables and it may be necessary to have the cables leaving the handlebars a good 7-9cm to give them a bit more room.
    Also, the degree of the location of the cable stops on the downtube (tucked under the tube more, or towards the outside of the tube), AND diameter of the downtube could eat up some real estate for clean routing of crossed cables. I prefer to cross my cables whenever possible.
    Will Neide (pronounced Nighty, like the thing worn to bed)

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