Torque spec for Aluminum 550M wheels?

Grant- On the 575M it is 100 Newton meters, which is 73.75 ft lbs of torque. On the 550 it is 98 Nm, which is 72.3 ft lbs.

Taz
Terry Phillips

 

Taz,
Where do you buy your torque wrenches from? They must be super accurate to measure 73.75 ft lbs!
Ron

 

Ron- Actually, my degree is in chemistry, so I just treat them like a burette and interpolate between the marks.

One of my assistants (I wish).

If you get a metric torque wrench, that matches pretty well, too.

I believe the pros actually use a higher torque number, at any rate.
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Taz,
That's what I was getting at, all you can do is interpolate between 2 marks and then take into account the accuracy, say +-4% and you dont know if it is over-reading or under-reading.
Nice photo, we used to have assistants like that in our research labs in the good old days.
Ron

 

that .75 is just the mathematical conversion

from Nm to ft-lbs

the torque figures for anything on any car is just the best measured value from factory, it's supposed to be not too high and not too low, whatever the part being torqued is it has a reasonably wide torque range that will work e.g. BMW torque specs for my car are 110Nm +/-15Nm

so anything from 95Nm to 125Nm will work

same on the ferrari


as for torque wrenches

I bought directly from snap on and then CDI (owned by snap on)

advice on wrenches
buy with small torque ranges for longevity, accuracy, and precision
-my CDI wrench goes from 60Nm to 250/300Nm (use it for wheels and suspension ($130-ish)
-my snap on goes form 15Nm - 60Nm for engine, suspension, and drivetrain

you can also visit garagejournal.com, they're an internet forum dedicated to tools there's a gentlemen on there that offers "Hazet" tools from germany

 

I know its not to spec but 72 ft pounds just feels too wimpy. I do 90 and it still feels weak with my 24" torque wrench. Just saying - my gut just says something different than head I guess.

 

Erik- Some of the pros use 90, 92, and 100 lb-ft. Not too many reports of wheels coming off, so somewhere between 72 and 100 has to be about right.