I Need Help Screwing Something

[Snoop Doug]

Right - that's got yer attention.

So I have a carbon aero seat post fitted to a carbon frame. It has a do upness of 4NM apparently. I need a torque wrench or else. That's what Dauphins said anyhoo - they reckon if I overtighten it'll crack the frame. So what you may ask?? Well I've ridden this TT bike twice now and both times it's left me lower back very sore - quite a sharp specific pain. I think the saddle must be too high. I'm a bit worried if I let the bolts off then redoing them might be accompanied by a carbony cracky sound. So - here's the question (I should stress that I do of course take full responsibility for any action I take based on any advice I may or may not receive). If I undo the bolts and remember how many turns, can I redo by the same number of turns with any degree of confidence that the do upness factor of 4NM is unlikely to be breached?

Phew! Answers on a postcard to dimwit dungeons please

Snoop

[Dominic]

How does your saddle height on your TT bike compare to your road bike?

It could be just getting used to a new position. I haven't altered anything on mine and my back, shoulders and neck are stiff after racing just from not being used to it again.

Try a few training rides on your TT bike to get used to it perhaps?

[Grahame]

I have a torque wrench* you can borrow if you like.

Let me know and I can bring it along on Saturday morning.

More details (ie torque range, and socket size) to follow when I get to dig it out of the toolbox tonight.

[Andrew G]

Get yourself one of [url=http://www.sheldonbrown.com/tork-grip.html]these[/url]. I normally go to FT as a standard rule of thumb but if you want to be cautious with your carbon then just go to real tight.

Can someone point Brian at the Carrababy too.
Anyone got any experience of a realMAN saddle?

[Snoop Doug]

Cheers m'dears. The pain is considerable and lasts for days so summat's up. I'm gonna do some measuring soon and see what gives. Grahame I'll check the tighteny doodad and get back to you, thanks.

Snoop

[neilb]

I think Cycling Weekly are now giving away torgue wrenches with a year's subscription (genuinely!)...

Cheers

Neil

[Snoop Doug]

grrrrr

Well I got my measure out - what did I find.

Saddle on TT bike is a centimetre (maybe even 11mil) higher than road bike. And the TT bike has 172.5 cranks v 170 on the road bike. Reckon that's enough to put me in a world of pain eh wot?

I wish there was a local(ish) bike shop that paid as much attention to set up as helping to empty the old wallet.

[Rob C]

Where did you buy the cervelo?

[Snoop Doug]

[quote="Rob C"]Where did you buy the cervelo?

[Andrew G]

Different manufacturer, and different frame angles, not to mention the bar set ups. Would've been better measuring you to fit the bike you were buying. They should've notice what length cranks were on the bike too .

[Snoop Doug]

[quote="Andrew G"]Different manufacturer, and different frame angles, not to mention the bar set ups. Would've been better measuring you to fit the bike you were buying. They should've notice what length cranks were on the bike too .