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Just noticed a couple of things on a freshly bought but used bike

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Just noticed a couple of things on a freshly bought but used bike

Old 09-15-11, 05:58 PM
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AtariBaby
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Just noticed a couple of things on a freshly bought but used bike

Many of you steered me toward buying this Cannondale Tandem, for which I'm grateful. We just noticed something and I seek your advice.


IMG_1130 by DesmondDoomsday, on Flickr

We just bought the bike, then took it to a mechanic to adjust gears the same day. A day or two later my wife looks down and sees this big strip of paint missing here. She swears it wasn't like that when we bought it but I can't be sure if it was the mechanic or what. Anyway, it's the type of thing that will bother her.

What can I do to make that look better? Touch-up paint out there somewhere?

Might the mechanic have done something to cause this? I note there is clear tape along the top of this. I wonder if there was clear tape on the bottom where the missing paint is, and the mechanic pulled off the tape and paint with it?

I'm also concerned that there is a pinched place in the aluminum at the left end of that missing paint. You can sort of make out the indentation. There is one in precisely the same place on the other side, making me wonder if it's there as part of the bike's design. But I need to make sure I'm not risking our safety or anything.
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Old 09-15-11, 08:42 PM
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Can't really see the indentation all that well, but as far as the finish on the stay goes... ask the mechanic.

Easiest way to deal with the blemish is to touch it up and then install a chain stay protector that hides your touch-up job:

Something like this: http://lizardskins.com/store/product...sive-chainstay
Or something like this: http://lizardskins.com/store/product...stay-protector

Better photos would help on the indentations but, once again... the mechanic who worked on your bike or someone from your shop should be able to give you a first-hand assessment.
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Old 09-16-11, 05:05 AM
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The indentation is the one for clearing the crank arm as it rotates I believe. As for the missing paint, you may want to see if the crank is lightly contacting the frame, or possibly the mechanic tightened the crankarm, This could have moved it inboard, making it lightly contact when ridden. Possibly the bottom bracket is not the correct length or a type that can be adjusted and it moved.

Find out before you ride any further, you do not want to damage the frame or cranks.

If this were an off-road bike may first impression would be chainsuck.

It could also be nothing more than paint needing touch up.

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Old 09-19-11, 12:47 PM
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Looks like chainsuck to me. It can happen on road bikes, too! Chainsuck is when the chain doesn't fully disengage from the chainring, often resulting in it jamming or at least scraping the paint off the chainstays. It's somewhat possible that this could have happened to you without you realizing it while you were riding, although generally chainsuck is pretty obvious. For a good treatise on the topic, see http://***an.co.za/Bikes/Csuck/

The indentation does look like it's designed for crankarm clearance, but it's hard to tell from the photos. Many bikes with fatter chainstays (aluminum bikes in general, and tandems) have this designed in to allow clearance. You may not have noticed it until the paint scrapes drew your attention down there.

We have neoprene chainstay guards on both our big bikes and they work great. One would likely cover up your paint scrapes and provide additional protection for the future.

One final note is that it is possible it's just the age of the paint and it's flaking off the tube. I've had this issue with older Cannondale singles I've owned.
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Old 09-20-11, 07:49 AM
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Phantoj
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The dents are for clearance for the cranks... The chainstays are big, so they have to be dented for the crank to clear.

The first car I bought, I didn't realize it had a large dent in front of the front wheel until the first time I washed it. It was a white car, hid dents well I guess. I'm guessing the paint damage was there when you bought it. No worries...
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Old 09-20-11, 12:25 PM
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+1 on the indentation is designed in there for crank arm clearance.

And the area where the paint is off is where the chain would scrape with "chain suck" Really not unusual for paint to get dinged up on the drive side chain stay.

Just put some touch up paint on it to keep the AL from oxidizing, and you'll be fine.
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