Bicycle Mechanics - What am I looking at ?

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poululla
07-21-04, 01:48 AM
This picture is of the underside of my father's De Rosa Planet downtube. What is it, and should he be worried? The bike has never been in a crash, if that helps. Comments are as always very welcome :D

NZLcyclist
07-21-04, 01:59 AM
uhhhh is it steel? that looks like rust under the paint......
poululla
07-21-04, 02:16 AM
uhhhh is it steel? that looks like rust under the paint......


A De Rosa Planet is an aluminium bike if you cared to check. If this is indeed a form of oxidation, is the integrity of the frame affected at all ?- only serious answers please. Watch the Boks beat the pants of the All Blacks this weekend :p

pucci
07-21-04, 03:00 AM
A De Rosa Planet is an aluminium bike if you cared to check. If this is indeed a form of oxidation, is the integrity of the frame affected at all ?- only serious answers please. Watch the Boks beat the pants of the All Blacks this weekend :p

You are looking at aluminum oxide powder under the paint. Lots of al frames get this around the braze-ons and other spots where moisture can get under the paint. There is no structual problem, just a bad skin condition.
poululla
07-21-04, 03:06 AM
Thanks for your reply Pucci, we thought along the same lines, but now we are sure. You were a great help.
Big H
07-22-04, 05:33 AM
RuA Bok fan. Not only am I a Bok fan and supporter I am a Blue Bull supporter as well!!!!

Big H