Need help understanding wheel sizes Wheel Diameter: 64cm/25 inch what does this mean? I'm thinking of buying a new bike. but Ive never heard of 25 in wheels. Or is the 64cm a 700c. I've only had 26 in up till now and my knowledge in the cm is next to none. can anyone help me please?
Having a look at the link provided in the comments the wheel make and model is pretty clear. Following a swift Google search the same wheel is advertised on Amazon as a 26".

https://www.amazon.co.uk/Hybrid-Front-Wheel-Knives-Dx3000/dp/6254401010

So, any 26" tyre  should fit you fine, although I'd be questionable of the seller, as mentioned in the comments above.