its the 35mm! going with as little gears as possibile so 8 (Shimano HG40 8 sp Cassette 11-13-15-17-20-23-26-34) going to put on an older steel bianchi road or peugeot mixie (havent actually got the frame yer (thursday)) so probably going to try to use basic friction shifters. is there anything i shoud know. is it even possibile??? and i know i will need a long cage derail. anybody recomend a good one or one they see cheap or even have??