Quote:
Originally Posted by Bob Ross
Interesting. I recall reading an article many years ago that claimed the reason there are torque specs on stem bolts was because the weak link in the assembly is the heads of the bolts, that the bolt would break (bolt head would snap off of the threaded section) long before the threaded section would strip out the material it was screwed into.
Then again, I read it on the internet, so who knows how reliable that info is.
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That really depends on the materials and design. The initial reason for torque specs on stem bolts was to prevent crushing of carbon fiber handlebars and steerers. In some cases, it is prevent cracking the face plate or stripping thread in the (aluminum) stem. In my observation, it is unusual for the bolt head to be first to break.