AlanG said:Â
This is a good idea but where do you find all of these values? I have a torque wrench and some things are marked, but I don't know where to look for other values. And I have several bikes, old and new.
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That's a fun question. Well, all the group components--derailleurs, shifters, brakes--will have spec sheets on their manufacturer websites. Get thee to those and inspect. As Swampy said, most of the torque values are going to be in the ball park of 5N-m. It could 5, 6,7,8 or summat. The torque on pedals is not large. In fact, unless there's an issue with bearings seizing, most pedals will tighten themselves a bit on the crank. Still, the manufacturer instruction sheet should specify that torque. The biggest torques are typically associated with the crank.....like the bolt tightening the hirth joint on Campy, Lightning, and Specialized cranks. Then there's the odd torque: on my Look 595 the biggest torque is on the seat rail clamp, 22 N-m. Sometimes stems and handlebars have torque printed on 'em. Another large torque item is the cassette lock ring. It usually has the torque printed on it. In short, you're gonna have to do some inspection and some searching online. If you can't find something, you can always post here and ask. It should be emphasized that if you're going to work on your bike, you really need to know these torques or have them readily available. In fact, there's no excuse, if you're working on your own bike, for not having these values. If something breaks, manufacturer analysis can reveal the point of failure and the likely cause. That means they can, if they put enough energy into it, find that something likely failed because it was over-torqued. That is of course only the case if you want the manufacturer to replace something.
