You can have them checked commercially. Or DIY by rigging a known force at a known distance.
Jonathan
You can but unless you’re a serious engineer how often do people do it?
Definately. I also recommend the same when taking them off. There is better designs in my opinion.Stevek76 wrote: ↑16 Sep 2021, 10:44pm For all the chat about torque wrenches or not I'd just like to highlight this part which I think is quite key!
"The two left crank arm mounting bolts should be tightened in stages rather than fully tightened at once. "
Don't just whack one straight up to 13Nm (or the equivalent 'about that much') while the other's still loose, and certainly don't do that and then do the 2nd up to 13Nm and ride away as the first will definitely be loose again and there'll likely be some odd stresses on the crank as well.
me neither. save your money.irc wrote: ↑16 Sep 2021, 1:55pm While Shimano may recommend regular checks I have never done (wasn't aware of the need) a d haven't had any problems.
I have also fitted the cranks without a torque wrench just judging tight but not too tight by hand.
One advantage for touring is they are easy to remove with minimal tool. Useful, I found, when packing the bike for return from the USA and could only get hold of a very small cardboard box. The frame with bars, wheels, and seatpost off still needed the cranks removed to squeeze in.
All that said at £22 I may try the torque wrench.