Strange paint chipping on chainstay

wilwil
wilwil Posts: 374
edited September 2008 in Workshop
The underside of my drive side chainstay is getting really badly chipped on my carbon Wilier Izoard (600 miles). There is a clear protecter on the top but I gather that the chain isn't supposed to hit the bottom of the stay. Any idea what is causing this? I have had some chain suck problems when changing down from large to small ring, could this do it? I have tried to retouch it but the chips fall on the edge of a white transfer on red section. Has anyone had similar problems?

Comments

  • biondino
    biondino Posts: 5,990
    Gravel?
  • Lagavulin
    Lagavulin Posts: 1,688
    I’ve just checked mine out and I just have a single, sizeable chip on the very bottom of the rear drive-side stay near to the drop out.
    However, I've only logged 210 miles since the computer went on it and probably a similar distance prior. It has also been pampered with no wet rides to date but I do usually pass a limestone quarry so I’d of expected mine to be worse than it is.

    Can I ask what paint you’re using to retouch? I just used to use Humbrol enamel on my Allez and then a bit of clear nail polish. Are these suitable for carbon?
  • wilwil
    wilwil Posts: 374
    biondino wrote:
    Gravel?
    From the front wheel? Funny that its only on one side.
  • wilwil
    wilwil Posts: 374
    Lagavulin wrote:
    I’ve just checked mine out and I just have a single, sizeable chip on the very bottom of the rear drive-side stay near to the drop out.
    However, I've only logged 210 miles since the computer went on it and probably a similar distance prior. It has also been pampered with no wet rides to date but I do usually pass a limestone quarry so I’d of expected mine to be worse than it is.

    Can I ask what paint you’re using to retouch? I just used to use Humbrol enamel on my Allez and then a bit of clear nail polish. Are these suitable for carbon?

    I have one near the drop out but most of them are in the middle under the wilier.it logo. I have a couple of stone chips on the down tube.

    The paint I use is Halfords Fiat red and Fiat white touch-up kits. The red is a perfect match. I hope its compatible with carbon! I'm considering putting a clear Lizard skin protector along the bottom, at the moment there is just a strip of insulating tape.
  • Lagavulin
    Lagavulin Posts: 1,688
    wilwil wrote:
    The paint I use is Halfords Fiat red and Fiat white touch-up kits. The red is a perfect match.
    Thanks. I might look into getting some of the red. Think my red Humbrol(s) will be a solid block. Been a while since I built an Airfix kit :lol:.

    Does seem a little odd that its drive-side only. While the Izoard is still pretty new the chips to my others bikes have, within reason, been evenly spread.
  • a_n_t
    a_n_t Posts: 2,011
    have the exact same thing on my mortirolo, chips under the drive side chain stay.

    strange!
    Manchester wheelers

    PB's
    10m 20:21 2014
    25m 53:18 20:13
    50m 1:57:12 2013
    100m Yeah right.
  • wilwil
    wilwil Posts: 374
    a_n_t wrote:
    have the exact same thing on my mortirolo, chips under the drive side chain stay.

    strange!

    What rear mech have you got? Have you got a compact chainset? Are Mortirolo chainstays the same shape as the Izoard's. Maybe its to do with the shape of the chainstay.
  • a_n_t
    a_n_t Posts: 2,011
    centaur rear mech, centaur carbon compact chainset.
    cant help with the design of the stays!
    Manchester wheelers

    PB's
    10m 20:21 2014
    25m 53:18 20:13
    50m 1:57:12 2013
    100m Yeah right.
  • wilwil
    wilwil Posts: 374
    I think I may have the answer, for me at least. Do you always put your left foot down first when dismounting? Then when you swing your right foot over do you catch the underneath of the stay with back edge of your shoe?
  • mididoctors
    mididoctors Posts: 18,419
    its the chain...no?

    bumpy roads whatever
    "If I was a 38 year old man, I definitely wouldn't be riding a bright yellow bike with Hello Kitty disc wheels, put it that way. What we're witnessing here is the world's most high profile mid-life crisis" Afx237vi Mon Jul 20, 2009 2:43 pm
  • SJLcp
    SJLcp Posts: 239
    Could be a slack chain slapping the underside of the stay? The fact that you mention its a compact suggests that a slacker chain is more likely - and the chain will be closer to the stay when on the inner front ring? Just an idea
  • Hi newby here! on my Pearson day rider( naff name , good bike)'ve cut a length of innertube to suit, then slit it along its length, then wrapped it along the chainstay held on with 4 black zippies, does the job 4 nowt. stumpy!
  • method
    method Posts: 784
    It's not a mystery, its your chain hitting the underside of the chainstay. Especially on bumpy raods. Get some clear bike shield or something and stick it on. Check your chain is the right length as well.
  • wilwil
    wilwil Posts: 374
    method wrote:
    It's not a mystery, its your chain hitting the underside of the chainstay. Especially on bumpy raods. Get some clear bike shield or something and stick it on. Check your chain is the right length as well.

    Why do they put the chain protector only on the top of the stay?
  • method
    method Posts: 784
    Good point, not sure. I think maybe its less common to have problems on the bottom. Probably dependent on chain length, although I'm just guessing.