Discuss light weight issues concerning road bikes & parts.
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wheelsONfire wrote:It seems this is due to corrosion, humidity and salt?
Perhaps in conjunction with a twisting load when we pedal it work itself off or in some cases crack?
So Shimano Hollow Technology is bascially a U-profile with a reversed U-profile glued on?
Its humid here in Orlando for sure but no salt water to worry about this far inland. The customer lives and rides in the central florida area. The glue on the inside was dry and chalky. This is a recreational rider.
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- Joined: Mon Nov 23, 2015 12:18 am
I wonder just how wide spread this really is. Is it design flaw or just a bad run of cranks? I just purchased a full 6800 group hang on a new Ti frame and now I'm wondering if I should for forego the crankset and find a nice 6700 crankset on eBay.
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I dunno but here in Thailand there seems to be an increasing number of failures, this happened to one of our club members a few weeks back, Shimano swapped it out under warranty. Failed after just 2000km/5 months.
I just got a new Ultegra crankset on my M9 and quite worried about whether it is going to fail.
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It’s a raging failure. I’m in the US and have seen this on several peoples Ultegra cranks. Shimano needs to do a recall or get badly sued when someone gets hurt.
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- Joined: Mon Aug 29, 2016 11:19 am
I don't remember my chemistry very well but it could be possible that something has started a corrosion between the two bonded pieces. Maybe a foreign element creating a galvanic cell. I would clean it thoroughly and apply a light layer of oil or thin grease. Polish that baby up after.
I recently got a cheap sisl2 crank which are two bonded alloy pieces and I did notice that corrosion had attacked it and started getting inbeteen the bonded layers. This is not good. I took some oil on a rag and wiped the crank down. It was bone dry and looked rather dusty when I got it. Probably a result of leaving it in a damp and dirty place without any previous treatment for a longer time.
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