Bicycle Mechanics - Dumb question about installing BB

Howdy-
My new FSA Compact SLK crankset came today, and I'll be doing my first BB install. Everything seems pretty simple and straight forward. My questions is how do you know your torque ft-lbs when using the Park BB-9 tool? Can you use this tool together with a torque wrench? If so, how? Thanks for your help...Pat
http://parktool.com/images/tools/BBT_9.jpg

I don't see how you'd attach it. I think you may need to do the measuring and weighting thing if you're that concerned about it. i.e. 1lb hanging 12" from center equals 1ft-lb.

Howdy-
My new FSA Compact SLK crankset came today, and I'll be doing my first BB install. Everything seems pretty simple and straight forward. My questions is how do you know your torque ft-lbs when using the Park BB-9 tool? Can you use this tool together with a torque wrench? If so, how? Thanks for your help...Pat
http://parktool.com/images/tools/BBT_9.jpgwww.parktool.com has the drill in the repair section,and even refrences that tool, and it's use. If all else fails,here is the ultimate torque wrench: www.sheldonbrown.com/tork-grip

www.parktool.com has the drill in the repair section,and even refrences that tool, and it's use. If all else fails,here is the ultimate torque wrench: www.sheldonbrown.com/tork-grip
I think I'll order Sheldon's Torque Wrench. Really, I read the section in Park Tool and that's where the picture's from. The site said to apply 60 lbs of force on the BB tool at 6" up the handle. I don't know how to tell if I'm applying 60 lbs or 100 lbs?

Find something that weighs 60 pounds. Something you can easily attach your wire of choice to. Then a hole in the wrench handle at your six inch mark and you're good to go.

My dog is about that and she has a harness with a nice convenient D-ring on the top.:D She's so amiable she'd probably go right along. The only problem would be getting it done while she's licking your face. hahaha my mental image is cracking me up.

Cheers

I think I'll order Sheldon's Torque Wrench. Really, I read the section in Park Tool and that's where the picture's from. The site said to apply 60 lbs of force on the BB tool at 6" up the handle. I don't know how to tell if I'm applying 60 lbs or 100 lbs?


I see your frustration. You're given a torque value, you're given a tool, but no way to combine the two.

That tool will not work with a standard torque wrench. You could make it work with standard torque wrench by cutting a square hole in it the size of a socket drive. Then you'd have to apply some physics to "calibrate" the torque wrench reading to applied torque.

Or, if you have a decent fish scale, you can use that to measure pull force. I think it's called a fish scale, used by anglers to find the weight of a fish by hanging the fish on the hook. The weight deflects a spring and weight can be read directly. In your case, attach the fish hook to a point at a known distance, say 6". Then pull on the fish scale until it reads 60lbs.

Remember:

60lbs @ 6 inches = 360 in-lb or 30 ft-lb or torque
30lbs @ 12 inches = 360 in-lb or 30 ft-lb of torque

Same results.

I said screw it to the torque specs and just tightened everything pretty snug. Installation went very smooth, barely even needed to adjust front DR. I tested it this morning on a 30 mile ride and I really like the compact crankset. I'll really try it tomorrow when I hit the hills for 80 miles :)

I said screw it to the torque specs and just tightened everything pretty snug. There ya go. I never torque anything on my bike and don't have any issues.