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Ideas on stopping corrosion: brake cable mounts on top tube(6 posts)

Ideas on stopping corrosion: brake cable mounts on top tubeKiwi
Sep 8, 2001 7:57 PM
I have noticed an increasing number of bikes with the paint lifting off the brake cable mounts on the top tube. Underneath the paint there is a build up of oxide. In all cases the frames are aluminum (numerous brands) or at least in the case of treks carbon frame the mounts are aluminum. Does anybody have advice on how to minimize or eliminate this problem when assembling new bikes.
TIA
i used bar tapeMade
Sep 8, 2001 11:49 PM
before my trek 2200 was totalled, the 99 model was black. so i used a piece of black handle bar wrap. just a 2 inch strip. taped it on my headtube with black electric tape, no more rubbing the heck out of the paint.
GreaseKerry Irons
Sep 9, 2001 8:44 AM
I couldn't understand the other post about handlebar tape - seems to be answering a different question. At any rate, any place you want to prevent corrosion on a bike frame, put a light film of grease on the surfaces prior to assembly. Need to re-do this pretty much annually, but it should be a normal part of the winter overhaul. For many years this has been standard practice among people who want their bikes to last. I first saw it in 1972, back when all the cable guides were clamp-on and you had lots of things that could/would rust if not maintained. It both protected the pain from the clamps, and kept the clamps from rusting. You will inevitably get nicks in the paint at contact points like this - the metal cable ferrules will cut right through the paint. If there's a film of grease there, the metal surfaces will be protected from salt and moisture.
re: Ideas on stopping corrosion: brake cable mounts on top tubeLone Gunman
Sep 9, 2001 12:47 PM
Currently repairing the damage from this type of setup on a steel frame. The shop used metal ferrels(plastic would have been better or electrical shrink tubing) on the cable housing against painted steel cable bosses. The cable rusted bad enough that it was binding and not releasing. The paint cracked, the moisture leaked in under the paint and rust had formed on the bosses. So I have done the best I can with stripping paint, primer and touchup paint on the bosses and am switching to teflon coated cables all over the bike to prevent the dreaded rust problem. As for housings rubbing, I am going to double or triple up some clear packing tape and apply at the contact point. I would try and find stainless steel brake cable or go with teflon covered for the rear brake.
CorrosionXTig
Sep 9, 2001 2:19 PM
This stuff arguably works better than anything else on the market. Thousands of saltwater boaters and anglers use it on anything that can rust with incredible results. No, I don't work for them! :o) Find a distributor from the web site or call a local boating supply store.

http://corrosionx.com/products.html
Yup, what I did...Greg Taylor
Sep 10, 2001 6:51 AM
...was replace all of the steel cable ferrules with plastic ones. Shimano STI cable uses plastic ends that are perfect for the job. The paint problem/oxidation is due to the galvanic interaction between the steel cable end and the aluminum stop. If you can't find them, I put a little Permatex Anti-Sieze (get it at your local Trak Auto, etc.) in the cable stop. It acts as a barrier that keeps corrosion in check.