Quote:
Originally Posted by
tenerod
Watching some build videos on motorcross rims they are torquing their spokes up to 15 or 18 Nm.
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I'm no expert at wheel building, but I have done it a handful of times with (I have to confess) mixed results, but the above ain't right! That's the sort of torque you would apply to fork pinch bolts, triple clamps etc. Way too much for spokes, or rather the nipples. (If they're yank videos it may well be 15-18 in lb?)
I've not come across a spoked motorcycle wheel needing more than 5-6Nm or torque, and many are (like ther OE wheel) around the 2-4Nm mark. It's very much dependent on the nipple size, with a 6.8mm nipple torque is usually 5.4Nm, much over 6Nm and it will shear.
Not sure what size nipples you get with the Excel rim kit for the Tenere, but they are unlikely to be any bigger than 6.8mm?
The vast majority of wheel builders I've come across don't actually use spoke torque wrenches as the torque settings are so small that the amount of lube applied to the nipple, or a speck of grit can effect the reading by as much as 50% (plus they use their experience). Fastidiously tightening every spoke to exactly the same "recommended" torque setting will not give you a true wheel. The torque quoted is really no more than a "maximum" you should go to in order to avoid breaking something.
A clue to what's right can be found in the fact that Talon/Excel's own torque wrench has a range of adjustment from 1.7 - 6.8Nm.
A dial gauge (or marker pen) and a careful ear for dinging the spokes whilst listening for an equal pitch sound to resonate from them is all you really need, or just take it to a good experienced wheel-builder who'll be able to build a wheel with new spokes and rim that's spot on in about half an hour!
Plus spoke torque wrenches are ridiculously expensive!