How do I find out torque settings for bike build

mosa

Building a new frame up where do I find out the setting to tighten each component. Can anyone recommend me a suitable torque wrench cheers

sungod

you need to look at the assembly instructions for each component

if not supplied with the components, you'll usually be able to download from manufacturers' websites

most 4mm hex bolts will be 5-6Nm at most, 5mm 6-9Nm*, for bigger stuff like cassette lockrings and pedals it's more a matter of tightening to mngghhh Nm (but not MMNNNGGAHHHHHH Nm)

*an obvious exception is the top cap bolt for headset preload, finger tight is usually enough

some lightweight components may have lower ratings that mustn't be exceeded, but, again, you need to check the instructions

torque ratings are often maximums, and presume any recommended lubrication has been done

in general you only need to go tight enough to get a secure fastening, but there are some that have a specified range

there're some general guidelines here...

http://www.parktool.com/blog/repair-hel ... d-concepts


torque wrenches... viewtopic.php?f=40004&t=12900076

desweller

Not everything is tightened to a torque value. Headset top cap and crankshaft end bolt (for HTII units) are only done up to the point where play in the bearing assembly is eliminated.

Some manufacturer torque values are a bit conservative; it's not unusual to hear of slipping seatposts and loose stems. It's worth having some hairspray or carbon assembly paste around to help.

Coach H

If you are using Campag then PM me your e-mail as I have put together an A4 summary sheet of Campag torque values (inc diagrams)

g00se

The Zinn road bike book has a lot of torque settings in the back for particular parts.

Bear in mind that one some items like stem steerer-clamp bolts have quite different torque settings between manufacturers (you're setting the bolt torque - not the actual pressure exerted on the steerer).

father_jack

I've printed off and laminated A4 sheet from park tools, with newtons to lb foot conversion on the other side. Comes in handy, and stays clean & dry