I have a Ultegra Crank 9sp double / standard crank, and the rings are staring to look like shark fins. I just raplaced the chain / cassettte last fall. I have put about 5k miles on the bike. I bought it used. So, I don't know how many miles are on the original.

But, when I look at the prices of the 105 10 speed cranks, they are approaching the cost of the chainrings. Would this cause a problem replacing a 9sp crank with a 10sp crank. Also, finding new 9sp cranks are becoming more and more scarce, at a decent price cept for fleabay.

So, would it better to get new chainrings, I haven't experienced much skipping if any, but I am worried that the shark fins might wear out my chain faster than needed. Any help would be appreciated.