To Torque Wrench or not?

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Roadrookie
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To Torque Wrench or not?

Postby Roadrookie » Wed Nov 28, 2012 20:59 pm

I bought a Giant Defy Composite a few months ago and have been worrying about over-tightening the seat post collar and cracking the frame. Is this a legit worry? Should I get a torque wrench and if so any recommendations on a reasonable budget model? I was out on a ride the other day and the seat post sank as it was under-tightened so I want to avoid that happening again but I definitely dont want to crack the frame.
Thanks

ChrisAOnABike
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Re: To Torque Wrench or not?

Postby ChrisAOnABike » Wed Nov 28, 2012 21:20 pm

I'll be interested in answers to this one too, since I'm in exactly the same position, also with a Giant Defy Comp.
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zippy483
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Re: To Torque Wrench or not?

Postby zippy483 » Wed Nov 28, 2012 21:25 pm

Yes it is worth getting one

And this one is well worth the limited expense

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Roadrookie
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Re: To Torque Wrench or not?

Postby Roadrookie » Wed Nov 28, 2012 21:29 pm

Thanks for the replies, will order one. Sounds like you need one too ChrisAOnABike.
Cheers

DefyComp2
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Re: To Torque Wrench or not?

Postby DefyComp2 » Wed Nov 28, 2012 22:14 pm

I have a Giant Defy Composite and I have a torque wrench and it is surprising how tight 6Nm actually is.
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Roadrookie
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Re: To Torque Wrench or not?

Postby Roadrookie » Wed Nov 28, 2012 22:31 pm

Thanks, that was my next question. 6Nm it is.
Cheers

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RRSODL
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Re: To Torque Wrench or not?

Postby RRSODL » Wed Nov 28, 2012 22:37 pm

DefyComp2 wrote:I have a Giant Defy Composite and I have a torque wrench and it is surprising how tight 6Nm actually is.


Totally agree with this statement.

I recently bought a torque wrench and I've been going through all stems, seatposts, etc. None were close to the limit. 5NM is more than I have used by hand.

To tight a seatpost, I always used guidelines given to me by a friend that is a bike mechanic. Tight enough that you cannot twist the saddle with one hand. I reckon that would be about 3NM

Stems were always finger tight and that was good enough and within the safety range.

gloomyandy
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Re: To Torque Wrench or not?

Postby gloomyandy » Thu Nov 29, 2012 00:05 am

Remember that if there is only a single torque value given this is the maximum. Very often a much lower value is more than sufficient, particularly if you use carbon paste.

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sungod
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Re: To Torque Wrench or not?

Postby sungod » Thu Nov 29, 2012 09:37 am

^^^this

rather than just tightening, get a tube of carbon assembly paste*, this increases friction between the post and tube, then...

remove seatpost, give it and the inside of the seattube a good wipe to remove any grease/crud

smear the paste over the post for the full length that will go into the seattube

put the post back in, it may take a bit of twisting/shoving to do this with the paste on it

tighten clamp, the post should now stay put with less clamping force

wipe off the excess paste around the top of the tube


*the finshline one is a bit grittier than the tacx one, if the post is already a tight fit i'd try the tacx type
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smidsy
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Re: To Torque Wrench or not?

Postby smidsy » Thu Nov 29, 2012 12:52 pm

You need to buy a decent quality torque wrench to get any benefit - cheap ones are as accurate as not having one.

Park tools one is where I would be going.
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ChrisAOnABike
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Re: To Torque Wrench or not?

Postby ChrisAOnABike » Thu Nov 29, 2012 13:43 pm

Roadrookie wrote:Thanks for the replies, will order one. Sounds like you need one too ChrisAOnABike.
Cheers

Yep, thanks too from me.
Is the gorilla tired yet?

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Rolf F
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Re: To Torque Wrench or not?

Postby Rolf F » Thu Nov 29, 2012 13:46 pm

smidsy wrote:You need to buy a decent quality torque wrench to get any benefit - cheap ones are as accurate as not having one.


Not really so - unless by cheap you mean something out of a Christmas cracker. Cheapness isn't necessarily going to be an indicator or otherwise of calibration accuracy and even a fairly poor torque wrench is likely to be vastly better than guessing.

Ultimately, unless you are assembling a bike from scratch, all you really need is consistency. You can use a torque wrench to measure how tightly a component is fitted (whether or not the measured torque corresponds to a specific factory setting) and use that setting as the value to re-torque the component when refitting. At no point in this process do you actually need to know what torque you are actually using. Obviously, if the torque wrench gives readings close to the factory values then you can be more confident that it is well calibrated but who gets their torque wrenches recalibrated regularly anyway?

BBB one works for me.
Faster than a tent.......

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Roadrookie
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Re: To Torque Wrench or not?

Postby Roadrookie » Thu Nov 29, 2012 15:38 pm

Thanks for the guidance all. I take the point about the carbon assembly paste and will order some too as I want to do what I can to avoid overtightening as much as possible but also dont want another dropped saddle halfway round a 20 mile ride. I see Giant do a Torque Wrench too so maybe that would be worth considering as cost is similar to BBB.
Cheers.

TommyB61
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Re: To Torque Wrench or not?

Postby TommyB61 » Thu Nov 29, 2012 16:05 pm

Rolf F wrote:
BBB one works for me.


+1 for the BBB version.

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drlodge
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Re: To Torque Wrench or not?

Postby drlodge » Thu Nov 29, 2012 16:18 pm

I've never used a torque wrench, and probably never will. I think I know by feel how tight something needs to be - the risk with a bike is generally overtigthening, and as long as its tight enough to do the job, then job done.

Different with say a car cyclinder head, where the bolts need to be at least a certain tightness, and even.
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PeteMadoc
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Re: To Torque Wrench or not?

Postby PeteMadoc » Thu Nov 29, 2012 16:20 pm

I have an inbuilt torque wrench

stem bolts = a little bit tight
seatpost bolts = not very tight
everything else = very tight
chainset bolts = very very tight

Always worked ok for me

TheTallCyclist
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Re: To Torque Wrench or not?

Postby TheTallCyclist » Thu Nov 29, 2012 16:28 pm

Get one. You will be surprised how much off you were before. Especially with carbon parts. I used to think a torque wrenches are bogus. Not anymore: http://www.thetallcyclist.com/2012/11/r ... ue-wrench/

Enjoy your new bike!

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drlodge
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Re: To Torque Wrench or not?

Postby drlodge » Thu Nov 29, 2012 16:31 pm

PeteMadoc wrote:I have an inbuilt torque wrench

stem bolts = a little bit tight
seatpost bolts = not very tight
everything else = very tight
chainset bolts = very very tight

Always worked ok for me


^--- this, kinda. The right amount to torque it is...not too tight, not to loose, just the right amount. Experience and common sense prevails, if you have both :lol:
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PeteMadoc
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Re: To Torque Wrench or not?

Postby PeteMadoc » Thu Nov 29, 2012 16:33 pm

Just turn the bolt until you hear a nice crackling sound....


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