Cush drive, spacer, rear sprocket and chain fecked. Looks like the bolts wernt high tensile. The front disk bolts look to be titanium?
So someone replaced the originals high tensile bolts with non HT bolts seven years ago and they all broke today? As theres no dirt or grease on any of the sheared bolts they have all gone at the same time?
Its a kineo wheel with its own sprocket etc so i dont know what way it was supplied?????? The wheel was already on the bike when i bought it.
I wouldn't let a cap head allen bolt anywhere near holding any sprocket of mine on. I haven't got the Sport Classic torque setting for the brake discs and sprocket. But on another Ducati of mine, they are 32NM for the discs and 44NM for the sprocket. You'll struggle to get that on those fasteners without rounding them imo. I'd change them immediately.
Oh i will be.i will be stripping the bike and checking all critical fasteners. I dodged the bullet this time. Many thanks foe the advice...iv posted this hopefully to draw attention to what happened and why. Check yar bikes folks lol.
They look like stainless steel socket button head screws? I imagine they should actually be at least grade 10.9 steel button heads. If they are stainless, that would possibly be the issue. Try a magnet on one. Someone possibly fitted stainless steel button heads to stop them rusting????
Extracted the snapped remnants and guess what.........no locktight. Im removing the caliper bolts now with a view to some quality replacements and think i may go down the lockwire route also.
I bet they are stainless, which is a no no for that use. They are great but very soft. A lot of classic bike guys have there wire wheels re spoked with stainless but usually a warning to be careful with them as the nipples snap off after a while. The bolts must be high tensile & as you say threadlock.
There are different grades of stainless steel. Some sellers of SS do not specify the grade, which means their stuff is probably A2 (i.e. no better than mild steel). Other sellers (e.g. Westfield ) offer a range of grades, including SS which can be substituted for high tensile. Take a look at the helpful Material Key on this page: https://www.westfieldfasteners.co.uk/ScrewBolt_M.html
