Join Date: Sep 2008
Location: Loveland, CO
Bikes: Two LOOK 585s, one KG461
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The fact is, Ti cogs will last about 1/2 as long as steel, but everyone uses different cogs more frequently, so the ultimate life depends on how much each cog is used. As an example, I do a lot of climbing in the Colorado mountains. Using a triple, my most frequently used cogs were the 19 and 21T. I wore out the 19T steel cog on one cassette in 6,000 miles, but another cassette ridden on the same routes, had both the 19 and 21T worn severely after only 4,000 miles.
After that cog wear problem was recognized, I never bought another cassette with Ti cogs. I also found that you can maimize cassette life, by alternating the use of 3-4 chains, so a new chain is never installed on cogs with much wear. That's what results in chain skip - a new chain on worn cogs. That same worn cog with a chain having only a few hunfred miles of use will not skip.