Mini-mini update, regarding a titanium spring. This:-
turned up on ebay a few weeks ago, attached to a broken 4x frame. I enquired with the seller about the spring rate, and he had it measured, the result was 450lb. Having made an offer for the shock only, we made a deal. It arrived this morning, and I popped over to my local suspension tuner, who I know very well, and used one of his tools to double check the rate.
The rate is exactly 450lb, which is surprising as a spring labelled '450' can usually measure anywhere between about 440-460. It is now fitted to the bike, and I am going to collect the brakes from the shop tomorrow.
I was also interested in buying the shock as it is XTD version, and I wanted to see if I could use the parts on this bike.
Upon stripping the shock, i was horrified to see the state of the oil. Not only was it black, but it was v smelly.
Although smelly oil isn't usually anything to worry about, black oil is. Something was worn inside and was depositing aluminium in the oil.Turns out the piston glide ring was completely worn, as was the piston oring, so the piston itself was rubbing on the shock body.
So much so that I assume the bearings were worn in the frame, and putting huge side loads on the shock. The shock bushes however feel brand new.
So, the shock stripped.
In no hurry to put it back together, I may get some parts made so that I can use this shock in the xtc, but I think it will be easiest to contact Foes to get the correct parts as spares, rather than make them. I would like to try a xtd shock, as the architecture is much more complicated inside, and I think the feel would be very different.
In the finish, the spring coming off is 444g, the ti spring going in is 230g. Happy, me.