So I offered to do some routine maintenance work on a family members low-end road bike the other day. They dropped it off yesterday, and I started work today.
Chain was knackered so I take that off. I then tried spinning the cranks.. The bottom bracket was more like a resistance unit! I could tell this one was going to be a right pain in the...
It's the old cup and cone style BB, so start by taking the lock ring off. Simple enough, right? Nope, it's seized solid. Commence lots of faffing about with GT85 and plenty of leverage to try and loosen this damn thing up and it finally comes off.
So now I just need to unscrew the adjustable cup to gain access to the BB, except it's also seized solid. I couldn't put enough pressure on the spanner flats to unscrew it without the tool slipping off, so that's was out of the question. Next I tried a pair of tounge-&-groove pliers on the flats, still can't get enough grip on it to prevent it from slipping off.
Next I tried a vice grip securely locked on to the exposed thread section of the adjustable cup. I could get far more grip and leverage this way, but the cup still wouldn't budge.
So I get the electric heat gun out, however this won't get the frame hot enough. So next I get the propane torch out and heat the BB shell up to a decent temperature, still no luck.
So I took the seat post out, filled the frame with GT85 and walked away, fettle unsuccessful.
