Originally Posted by
Sifaw
cutting my frame is not something i wanna get into id just rather replace the shifters derraileur and crankset to a 3 ring one (shimano makes 3 ring cranks for road with 130mm)
but still it bugs me that the same frame (cube attain simplest model) is on that website with a
- crankset Shimano Claris FC-2450, 50x34T
- Bolt Circle: 110mm
Which is why I say go to a shop. All of the things you report don't add up, between what you say you measure and what the frame spec online is.
A) If the BB is actually 73mm then a 105 or Tiagra crank will not work. Period.
We know 105 works, because the stock Cube 2017 105 model has well 105. Per Cube's own tables
B) You say you have "bb-rs500 70mm (no spacers) " that "and it attaches fine on the frame."....well firstly that bb is 68mm and not 70mm. Secondly the frame specification says that frame takes a pressfit BB and not a threaded BB at all. That BB part number and your frame (per Cube's data) 100% cannot work with one another.
It is hard to help you, because what you say you have is not what the manufacturers of the individual parts say you. Which means you are measuring incorrectly and/or using the wrong part numbers....or have knock off parts (like say a frame from EBay that wasn't actually made by Cube).