Spindle wear is a problem that can kill any crank, sometimes in record time. When it comes to cranks with integrated spindles, like a Shimano crank, rather than a modular system, like a Cannondale Si crank, excessive spindle wear can destroy a crank permanently. Let's talk about how this happens, how to diagnose the problem, and how to prevent it.
Now this is something that I like to do I mean when it's a really new bike or an old bike either way. I like to do it. It's just a good check and that is just to take our handy vernier caliper and make sure it's zeroed and calibrated and come in here and measure the spindle itself. Now of course these surfaces have been cleaned very thoroughly so we can get an accurate measurement and we want to see what kind of wear we're experiencing out here on this spindle over time because you can see definitely that where this has been what's called fretting right there. That is where the wear is occurring as this is operating you see it's supposed to be 24mm and you can see it's not 24mm everywhere this one's not worn enough for me to even worry about it because the polymer shield will take this up but if this was in a bottom bracket that used what's called a well a bearing that's a or I think it's a 37-24 either way the one that's 24mm in the id that a lot of companies use this could actually be a problem once it deviates from that 24mm dead on and to exacerbate that the steel races in that setup will actually wear this and cause this problem that's why we use polymer inserts in our Shimano products
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