The picture is not really clear so I cannot tell what that is. It could be paint as far as I can tell by this picture. Is this the new bike you just bought?
Most tubes will not split (assuming that this is a steel bike which it looks like it is) they may have cracks in them, usually at welds or where a person might have run into somethign with the front wheel and the tubes give way, but usually in the other direction, (ie. the only way I can think of this is across grain rather than with the grain?) If a bike has a cracked tube, you can have someone weld another in place - the wonders and fixability of a steel frame!
spoke



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