A customer at my shop in Boise told me to never use a torque wrench on carbon parts

This guy came in last month with a high end carbon road bike, a real nice one. He watched me grab my torque wrench to adjust his stem and got real serious. He said, 'You know, a real mechanic just feels it. Those wrenches are for people who don't know what they're doing.' He was dead sure that his 'calibrated hand' was better than a tool set to 5 Newton meters. It stuck with me because he was so confident, but that's how you get a cracked steerer tube or a stripped bolt. I told him I'd rather trust the spec from the engineers who built the frame. He just shook his head like I was the one being dumb. Has anyone else had a customer argue against using the right tools for safety critical parts?

3 comments

3 Comments

josephl671mo ago

Seriously, that's how you end up with a broken bike. My buddy thought the same thing and snapped a seatpost clamp. Those torque specs are there for a reason, right?

adam7511mo ago

Wow, that's wild. Carbon needs a precise touch that even a good feel can't match, and those specs exist for a reason. That guy is gambling with a very expensive part.

markhall1mo ago

Yeah, that line about a "calibrated hand" is the whole thing... It's like people think having a skill means you ignore the rules. You see it everywhere, from cooking to working on cars. They treat the written instructions like they're for beginners, not the people who actually made the thing. It's a weird kind of pride that ends up breaking stuff.