WOW, thank you so much, Neil, for your fantastic info!
It is great to read about all the details!
I have looked at the brochure page in your profile. Above I have attached the complete 1991 brochure - unfortunately it is in German...
The brochure says that the bike has XT equipment, but the pedals are Deore DX!?
I have also taken a closer look at the rest:
Both wheels are Avenir Duro 17. On the back hub I can read Deore and 14G. The front hub looks the same, but I cannot read anything.
The brakes (at the handlebar) are Dia Compe. At the tires I can just read Shimano, on the "brake rubber" it says Deore XT. The brakes seem to work very well - saved my life yesterday!
On the crankset I can only read Shimano SG. And the standard 24, 36 and 46.
The seat post is Avenir 4130 - just like the brochure says it should be.
The saddle is Selle Royal (Royal Vacuum Light). Seems like a nice one.
Both derailleurs are Deore XT.
The gear shifters are Deore XT. There is also the option of SIS - F. What is this for?!
My only problem so far with the bike has been the gear shifting. The shifter on the left (3x) is hard to move - I need to use quite some force to do so. Sometimes the chain even falls of! I am still trying to figure out exactly why and when this happens. With some gears there is sometimes a strange noice - like if the bike has not hit the exact gear. Sometimes it goes away, if I adjust the shifters a little. Oh, and the lowest gear (x3) does not seem to work/ the chain makes loud noices.
I asked the bike dealer to do the gears for me and this is the result...
Maybe the only thing to do, is to do it myself, but I do not have a clue what to do... I would be very happy for any advice!