I upgraded to an XT crankset about 4 or 5 months ago, the shop where I bought it installed it for me as I'm not too proficient with tools and assembly!
I trusted their methods as they're a very popular shop on my side of Bangkok, however, I noticed they didn't use a torque wrench, this only seemed odd to me when I realised that a torque wrench is quite important...
Anyhow, today, whilst going round a corner, my chain derailed and the force of pedalling with no opposing force destabilised the tyres and I slid. I got up quickly as Bangkok streets are not the best places to lay around and I tried to pedal, that's when I noticed the chain was off, I had a fiddle around and noticed one of the chain ring bolts was loose, I took my bike straight to the shop but they were reluctant to do anything at all, I ended up having to pay for some new bolts, which I'm pretty unhappy about as they fit the bloody things in the first place!!
Have a look at these, the top 5 or 6 rings of thread have completely gone!
I wasn't feeling very confident about riding out of that shop when they fitted some new bolts, I wanted a complete new crankset, a little unreasonable I understand, and I didn't ask for that, but I bloody well wanted to!
Now I have another piece of skin missing...
Is it normal for these bolts to fail like this? I bought XT with the understanding that they were strong, albeit a little heavy, why are alloy bolts used for the chain rings?? Are alloy bolts usually perfectly adequate if they're not tightened to f*ck?
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