i bought old Peugeot carbolite 103. With size 60cm which is very big for me, so I have an idea to cut it to 50cm. Do you think it's worth it and the risks?
Edit: Guys thanks for the fastest responding. I will search for another frame.
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It isn’t possible to resize a bike like this. You would be talking about removing each individual tube, cutting it down to size, and then rejoining them. We would be talking about all the tubes, not just one. You don’t know how much to remove. You don’t know how to rejoin the tubes. You would basically be destroying the bike to rebuild it even if you knew these factors. It would have been better to buy the correct size bike to being with, and if you have no idea what is the correct size you are better off buying new from a store or getting a knowledgeable friend to help.
One other factor to consider is how economical this action would be. Even if it were practical to re-construct the frame, you'd need to remove all the parts. You aren't likely to have the tools to do this, so this is already a bit of a pricey proposition. Given that these are steel tubes, you'd also need the equipment to cut and miter the tubes so that they can be joined. Then you'd need equipment for joining the tubes - I think the frame isn't lugged, but I can't tell if it's brazed or welded. Whatever the case, the framebuilding equipment is much more expensive than tools for bike servicing. Even if the process were possible and you had the skills to do it, this is unlikely to be practical unless you're already a framebuilder.
While not directly relevant to the question, one commenter referenced the concept of the Ship of Theseus. This is a thought experiment used in the metaphysics of identity. As applied to bicycles, the consensus is that if you upgrade the frame, it is essentially a totally different bicycle. That would seem to apply here.