How does one convince their mum to buy them a bicycle?

Hello,

I found a really good deal on a raleigh criterium and I wanted to ask my mum to get it for me but she refused because it had "thin wheels so it must a a sports bike" and "tell me, what sport do you do" She wants me to get a bike with mountain bike/BMX wheels and even after hours of convincing her that those kind of wheels are for forest environments and that there are like 0 forests in London, she still hasn't been convinced.

Please help

I didn't find the right solution from the internet.

References:

https://forum.cyclinguk.org/viewtopic.php?t=121874

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Thanks