Newbie - saddle, stem, handlebar tightening torque.

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deanyboy
Posts: 12
Joined: Sun Aug 26, 2012 12:55 pm

Newbie - saddle, stem, handlebar tightening torque.

Postby deanyboy » Sat Oct 27, 2012 15:26 pm

Hi

I just got a new Giant road bike and I'm looking to make adjustments for a good fit.
I was adjusting the seat post. My owners manual suggested the seat post - M4 binder bolt should be tightened to 1.9 - 3.9 Nm.

Where should I be exactly setting my torque wrench?

I set it somewhere in between 2 to 4 Nm (I have a basic Giant torque wrench). The bolt popped and now wont screw in, it's now useless. What am I doing wrong? I don't want to continue on the bike because I don't trust this user manual at the moment.

Thanks

alex_uk
Posts: 52
Joined: Fri Jul 17, 2009 22:54 pm

Re: Newbie - saddle, stem, handlebar tightening torque.

Postby alex_uk » Sat Oct 27, 2012 15:38 pm

If you just need to get the bolts tightened properly then this can be done without a torque wrench. I'm not sure from your post if this information will be useful to you - apologies if not.

A standard pack of allen keys are different lengths for each size - the bigger the size the longer the tool, and so the more torque you can put in to it. In other words, smaller bolts will receive a lesser torque by virtue of you having less tool to pull on. So, what I do, is tighten the bolt by just holding the available length comfortably in my hand and putting on a steady exertion.

That will get the sort of bolts your talking about done to an adequate torque.

Hope that is useful to you!

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sungod
Posts: 6644
Joined: Sat Nov 07, 2009 13:52 pm

Re: Newbie - saddle, stem, handlebar tightening torque.

Postby sungod » Sat Oct 27, 2012 16:46 pm

are you sure your torque wrench is accurate? m4 is quite small, if the parts are alloy or low strength then there's not much margin for error

as above, just tighten until things are secure

mostly i use a torque wrench as a way to avoid going over the maximum on more delicate bits like alloy bolts or fastening cf, the rest of the time an allen key is enough

there're some things that need a specific torque setting

but for most only the maximum rating is of interest, and you usually don't need to go anywhere near it
my bike - faster than god's and twice as shiny

deanyboy
Posts: 12
Joined: Sun Aug 26, 2012 12:55 pm

Re: Newbie - saddle, stem, handlebar tightening torque.

Postby deanyboy » Sat Oct 27, 2012 17:52 pm

Cheers guys.

Just got a new seat post clamp from Halfords. Its cheap but does the job a lot better then the Giant one.
It's thicker and stronger. I'm really surprised at how bad the Giant one was.

deanyboy
Posts: 12
Joined: Sun Aug 26, 2012 12:55 pm

Re: Newbie - saddle, stem, handlebar tightening torque.

Postby deanyboy » Sat Oct 27, 2012 17:56 pm

I'll just apply the right amount of torque that I think's needed from now on. I can tell if it's tight enough.

Yes Sungod it's definitely a M4. Really small and flimsy.


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