Originally Posted by valleysuper

In my efforts to use parts I have for my build, I could use some help.
From what I have read I think it will work, but if anyone with experience could help.

It’s a 1996 GT Karakoram with full deore 8spd on it.
Looking to run Ultegra 10 spd 50/34 crank, with 105 9 spd shifters and front derailleur. I’d like to keep the deore rear derailleur, and cassette that’s on it.

I have read that the 9spd 105 shifter throw will match the 8spd deore rear derailleur. Also that the deore rear derailleur could run as 8 or 9 spd? It was stated things change when 10 speed was introduced, but that 8and 9 speed throw ratios were the same on Shimano road and mtb shifters?
Does anyone know if there is truth to this?

Thank you for any help.