Crank bolt torques?

[cousinkenni]

Hey guys,

Any body know the crank bolt torque specs for Middleburn RS7s? Truvativ uses 30-35 ft-lbs, Race face uses 40 then 35 ft-lbs for subsequesnt tightenings. My cranks didn't come with any paperwork/specs.

Please don't answer with "till it stops" or "till it gets tight". No offense but it won't help.

Thanks

Ken T.

[xxxfr]

40 ftlbs, but check you bbs torque too

[Matt]

You can also always contact middleburn to double check. http://www.middleburn.co.uk/contact.php

[cousinkenni]

Thank you for your input xxxfr but I just wrote middleburn. Not that I don't trust your word but I would like to double check. I was hoping to install them this weekend, but I guess I will have to wait till monday/tuesday when they get back to me.

[[BMF]Andy]

You must be the most patient person in the world. As soon as I get new bike parts there is no waiting before they are installed, directions or not.

[jmkimmel]

On a similar, thread-jacking note, how important really is it to get exact torques for the various bolts on a bike? I usually just go by the "20 ft-lb's is the same as 5lbs from my hand on a inch lever arm" kind of measurement - ballpark but not exact. Anybody know if it really makes any difference?

[KeepRollin]

On a similar, thread-jacking note, how important really is it to get exact torques for the various bolts on a bike? I usually just go by the "20 ft-lb's is the same as 5lbs from my hand on a inch lever arm" kind of measurement - ballpark but not exact. Anybody know if it really makes any difference?
It has to do with bolt preloading. A bolt is the strongest when it is preloaded properly. Those values are most likely the value which will give you the strongest attachment. I never worry about it. I tighten as much as I can with my allens. (though I don't have the super long allens) I haven't busted any bolts/stripped threads yet and they never come loose.

[xxxfr]

technically....yes, but no

[tomacropod]

just use commonsense. If you're tightening an m5 steel bolt into an aluminium thread, go gentle. If you've been supplied with a fuckoff big m12 steel bolt and a matching hardened female thread, go nuts. Consider the vibrations and forces that the bolt will experience and whether overtightening will bind or bend anything.

The bolts that hold your brakes onto the posts, for instance, I see people overtightening all the time, and then they complain that their brake arms return slowly...duh...

- Joel

[cousinkenni]

In case anyone cares (not that anyone should with the responses I got back) the correct torque on Middleburn RS7 crank bolts is 20 ftlbs.

Ken T.

[tomacropod]

In case anyone cares (not that anyone should with the responses I got back) the correct torque on Middleburn RS7 crank bolts is 20 ftlbs.

Ken T.
it's good to know that for sure...I'll be installing a new pair of rs7s soonish...

...of course I don't have a torque wrench...

- Joel

[Turtlehead]

Seriously, I can't believe anyone would truly worry about the exact torque for their cranks, just put the stupid things on and go ride. If you don't know if you've tightened the bolt enough or not, then you probably shouldn't be doing your own work. To put off riding your bike because you don't know the correct torque is THE MOST ABSURD thing I think I've read on this site...

[mikeschiavone]

turtlehead, PLEASE dont tell me you work at a bike shop.

[tomacropod]

Seriously, I can't believe anyone would truly worry about the exact torque for their cranks, just put the stupid things on and go ride. If you don't know if you've tightened the bolt enough or not, then you probably shouldn't be doing your own work. To put off riding your bike because you don't know the correct torque is THE MOST ABSURD thing I think I've read on this site...
Dude, fuck up. Some people spend shitloads of money on nice bits, if they're not confident, they shouldn't just jump in. You're confident, and you're mostly right. Good for you. It's not like that for everyone else.

Advice can never hurt you. Kenni, ignore this shit.

- Joel

[Turtlehead]

Lol,
amazing how the trials world changes in just five years... from a bunch of guys riding to a bunch of guys who can't ride their bike unless they have the perfect torque. And then those guys who want the right torque go online to a forum where they are fed wrong information... tis a sad day

[cousinkenni]

Turtlehead,

You just shouldn't post, you only sound like an IDIOT! If you look at my post it said:

"I was hoping to install them this weekend, but I guess I will have to wait till monday/tuesday when they get back to me."

No where did I ever say that the torque was preventing me from riding. I am still waiting for a wheelset from webcyclery. I figured since I had all the spare time I might as well install everthing else CORRECTLY while it is new. I tend to save the jerry-rigging and hacking till after the parts are worn and not working properly.

Come to think of it, Mike was right people like you are the reason why I do all the work myself.

As for the guys on the forum, sure there is some "wrong information" but there is some good stuff from people like Kevin, Matt, Roman, Adam once in a while Elan, Andrew, Joel.

But hey, if you want to keep talking shit do it!
Like beef, fly Hawaii brah, we show you one good time!

Ken T.

[Turtlehead]

Lol, yep... cause I sound like an idiot when you say to read your post. That I did... I'd surmise that anyone else reading your post assumed that you were not riding these new parts because you were waiting for a reply... so maybe I sounded like an idiot to you, but maybe you just didn't include all the information needed... but hey... I'm stoked to have pissed you off. I hope we can ride together sometime.

[tomacropod]

Turtle, five years ago you were one of those noobs who asked everyone for advice, don't make like you were as cool as you are now from the get go.

This is a small sport and assholes like you who just want to prey on people online are going to make it as snobbish, elitist and unappealing as...photography !

- Joel

[netto]

Lol,
amazing how the trials world changes in just five years... from a bunch of guys riding to a bunch of guys who can't ride their bike unless they have the perfect torque. And then those guys who want the right torque go online to a forum where they are fed wrong information... tis a sad day
why would you bother posting that....

[netto]

unless you are retarded and have no life like me

[netto]

=)look this is my third post
and i have not answered his question
i must be cool

[Cryo-Cube]

im wit Turtlehead on this,
I never used a torque wrenche in my life, 99% of all the bmx riders probably too, they still kick trialers ass and stress their material. Seriously how often do you fuck up lets say a Crank because you didn´t apply the right torque?
wtf?

[tomacropod]

im wit Turtlehead on this,
I never used a torque wrenche in my life, so have probably 99% of all the bmx riders. Seriously how often do you brake lets say a Crank because you apply the right torque?
wtf?
The only thing that makes sense from your post is that you are wit turtlehead on this.

I don't understand how someone being catious hurts you guys?

What is your problem here?

I don't like pulling apart suspension forks or car engines, I have little experience with either. Does this make me a retard if I ask for advice or am cautious with the torques I apply?

I've never used a torque wrench in my life either, but if I had one, I would probably use it on sensitive parts until I got the feel for what the right torque was.

To answer part of your rhetorical question, I'd say it's rare for one to "brake" a crank because they applied the right torque. The whole point of applying the right torque would be to prolong the life of your components, not to shorten it.

- Joel

[Cryo-Cube]

car engines / suspension forks vs a crank bolt
your analogy sucks

The only thing that makes sense from your post is that you are wit turtlehead on this.

I
To answer part of your rhetorical question, I'd say it's rare for one to "brake" a crank because they applied the right torque. The whole point of applying the right torque would be to prolong the life of your components, not to shorten it.

- Joel

yeah thats my fault, i didnt get the sentence right.Edited it, should be readable now
My english = :ugh:

[tomacropod]

so we're even, my analogy sucks and you suck?

sounds fair.

- Joel

[Turtlehead]

Turtle, five years ago you were one of those noobs who asked everyone for advice, don't make like you were as cool as you are now from the get go.

This is a small sport and assholes like you who just want to prey on people online are going to make it as snobbish, elitist and unappealing as...photography !

- Joel
Actually, no I wasn't. If you knew much about the past of your sport you'd have more insight, but unfortunatel you don't. I know... you'll argue that, but hey, that's the fun of the net, posting and pissing people off... lol, get them all fired up. I love it...
So I guess I should get to my original point and make it a bit more simple:
Don't freaking fret over the torque of a bolt, just ride your bike.

[tomacropod]

when I was younger perhaps I found it fun to post for the sake of pissing people off. It's a pretty short-lived satisfaction though, as you might find out someday.

I'm not fired up, don't concern yourself. Good evening, don't shoot any photographers with that thing in your avatar.

I think that together, Tim, we can say we've made the point about the torque in a very well-rounded and multi-approach manner.

A good job by all.

- Joel

[Turtlehead]

Tomac...
When you were younger? how old are you now oh wise and mature one?
Do you not like photographers and people who shoot guns?
Well, I have no way of pissing you off, so I won't go on with anymore smartass remarks, cause obviously they cause no reaction at all... so sad... and yes... one day maybe I will become old and wise such as yourself and realize my foolish ways... one day
And yes, I would agree, we have covered both angles on this...
It's cool to torque to the right specs, and it's cool to ride...

[AndyT]

:dunno: if my bolt comes loose I tighten it.



When I started riding I knew nothing about bikes, I rode my bike with the headset almost falling off for 4 months- I had no idea. The first 'group ride' I had the guy was like "your bike is totally fucked up" and he fixed 10 things on it. It was awesome....yeah .... :hsugh:

[Elan]

concerning past, present, and future posts like this one, i think matt should adopt and front-pageify the motto "when in doubt, stfu and ride"



im listening to das modell hardcore style

[tomacropod]

Tomac...
When you were younger? how old are you now oh wise and mature one?
Do you not like photographers and people who shoot guns?
Well, I have no way of pissing you off, so I won't go on with anymore smartass remarks, cause obviously they cause no reaction at all... so sad... and yes... one day maybe I will become old and wise such as yourself and realize my foolish ways... one day
And yes, I would agree, we have covered both angles on this...
It's cool to torque to the right specs, and it's cool to ride...
I've never had a younger lover - you're no exception.

I have no problem with photographers per se.

even andrew admits ^^^^ he didn't always know all. HOWZAT !

- Joel