All about the Torque

FrizzleFried

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Being (likely) over-careful about these chinese motors... what do you guys torque things on your bike down to? Do you use a torque wrench or just feel it out? I'm a big guy and have the ability to but some serious foot/pounds in to the wrench... which means I have a knack for over-tightening things.

Maybe y'all can give your opinions on these things... I'll put what I've done and see just how "off" I am...

Head bolts: 12 foot/pounds
Axle bolts: I torque them down pretty damn good... but still not nearly my maximum. I am afraid my maximum torque would simply torque off the damn bolts. I've actually broken a friggin VW rim bolt torquing it down... not fun. I'd love to know a good "official" torque to aim for.
Exhaust bolts: Using the smallest driver I have I really do not put a bunch of torque in to these. I'm afraid of breaking off the stud... no good.
Mounting bolts: These are what I'd love to know what people torque their down to. My brother really cranks on his... but I gotta admit, I'm so damn nervous of breaking off a stud I probably don't crank mine down enough. Is there an 'official' torque I can aim for?
Misc bolts: Rim brake bolts... I crank mine down pretty hard. Still not my max (nothing gets my max on the bike, actually). How about disc brake bolts (I don't have `em yet, but soon)... etc... etc..

Did I miss anything? Sometimes it's a pain in the ass being a rather large guy... I tend to be "all thumbs" when it comes to more exact things. Any/all help would be greatly appreciated.
 

Juicyjayocean

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There are cheap torque wrenches you can get they have a bar that moves though they don't click like the expensive ones so they aren't as accurate but they get you ball park at least
 

FrizzleFried

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...but is there a chart for Chinese manufacturered blocks... THAT is the most concerning... pulling the posts from the block...
 

FrizzleFried

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Looking at some charts... it seems that Metric uses CLASS not GRADE. Now how in the hell do we have Grade 8 hardware in metric sizes or am I reading things incorrectly?
 

FrizzleFried

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81S7OnFJ86S._AC_SL1500_.jpg


...though I see some referencing Grade 8.8 for metric sizes...

EDIT: Hell, at the top there it shows Grade 10.9 (i assume Class 10.9) = Grade 8.

So logicial... not.
 

FrizzleFried

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Tell me if I am right here... it looks like M8... which is what my mounting bolts are... at class 10.9... come in at 26 ft/lbs... or 24 ft/lbs... depending on if they are fine threads or not. I 'think' they are standard pitch... right? So 24 ft/lbs... but then why is the head coming in at 12 ft/lbs when those rods are also M8... right?

EDIT: Hell, those are LUBRACATED numbers... seems 10.9 comes in at 35 fine and 32 standard with non lube...
 
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