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I have a Cube Analog Disc 2012 bike, and recently discovered that I have no screws inserted in the bottle cage mounts. Is it possible for rust to form in this area? Also, is it possible for the water to enter inside the tube and develop rust on the inside (since there is no hole at the bottom of the frame, I believe water will remain inside until it clears off)?

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2 Answers

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It is possible for water or sweat to enter the frame, and for corrosion to build up. Any rust would be most likely to happen on the steel bolt (which is missing) rather than on the aluminum frame, but oxidization comes in many forms.

While this is unlikely to cause you any significant issues, it's an easy fix. Any M4 threaded allen bolt, between 1.5 and 2.5cm will fit just fine.

Stop by the hardware store or your LBS, and you'll be sorted in just a few minutes.

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OK, I've seen a little bit of rust near the steel bolt and I thought my whole frame would be in "danger". I'll stop then and buy some bolts. I believe it won't be a problem if the bolts are not the original bolts which should have come with my bike, right? – linkyndy May 10 '12 at 13:59
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@linkyndy - As long as the bolts fit and turn smoothly, it doesn't matter if they're original equipment or not. – Neil Fein May 10 '12 at 15:39
The screws should be stainless steel and essentially rust-proof. The main danger from water on the inside (even in a steel frame) is to the bottom bracket -- they can get quite rusty. – Daniel R Hicks May 11 '12 at 10:52
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Your bike has aluminium frame, it can not suffer from rust. There is such thing as aluminium corrosion, but it is a very slow process, you bike will be fine for years.

But, of course, you better cover the holes. Cheap solution is a piece of tape, but you can either buy a bottle cage or any screws that fit there.

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