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I bought a used Cannondale SL Frame to build up as single speed. I was checking it over and I noticed this. Not worried about the mark on the top tube, more the line on the rear stay. Just a crack in the paint?
[img][url= https://c7.staticflickr.com/9/8086/28386880894_d9e20df7e3_k.jp g" target="_blank">https://c7.staticflickr.com/9/8086/28386880894_d9e20df7e3_k.jp g"/> [/img][/url][url= https://flic.kr/p/KfsbGW ]IMG_1090[/url] by [url= https://www.flickr.com/photos/143872962@N06/ ]Tim Dart[/url], on Flickr[/img]
Hard to say. Is it alloy?
Best bet is lay it on its side and spray some oil on the area, if it seeps through its a crack.
The top tube looks mashed though
Yes it's alloy. I will try the oil, cheers