The model has been modeled in Blender 3.1 and rendered in Cycles. It is a High Poly model (No subsurface division used) and the polygon size is high because of the rims and bicycle chain. For the model, PBR textures have been used. It has been modeled from the reference images of three vintage bicycles and there was no brake system on none of the references, therefore, the brake system has not been modeled. In case of request, I model and add the brake system with no charge.
VintageBicycle.zip folder contains Blender file and also Textures in one folder.
All other formats (Obj, FBX, and Collada) have been exported from Blender 3.1 therefore in case of any problem with any format, please feel free to contact me. I will be happy to solve any problem with the files or model.