Do I have to replace my bike?

dark scar

New member
I'm planning on buying a bike, and spending quite a bit of money making it awesome. The bike itself is relatively expensive (maybe not for a bike, dunno) at around £600, and I plan on customizing it a bit.
I don't want to waste money, as, at nearly 15, I'm still growing. I don't know exactly how tall I am, but it's about 6 foot. If I grow out of the bike, will I have to replace it, or is there anything I could do to not have to replace it. I thought that I could just get some bigger wheels ( tyres? ) as I grow. Would this work?
Thanks in advance. :]
PS. I'll be getting a trek hardtail mountain bike. Probably a 4300, 4500 or similar.
 
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