Here is an illustration of our smallest Stanforth Conway with an effective seat tube of 52.5cm and actual sea tube length of 43.1cm. We have estimated the saddle height at 628mm based on a height of 5' 2". A custom Conway for your specific measurements might be a better alternative to this size as assuming an inside leg measurement of 711mm (28") - the standover height of the bike will be circa 2cm higher at 729mm, so it might be worth considering bespoke geometry of this frame - we would recommend a slightly steeper sloping top tube tailored to your inside leg. Please email us on email@example.com to discuss your custom Stanforth Conway.
It will be worthwhile measuring your inside leg measurement - if it's longer than 28" than it's likely the saddle will need to be higher than that shown in the image. To do this 1. Get a book and stand with your back against the wall, 2. Place the book in between your legs as high as it will go, 3. Move away from the wall keeping the book against the wall and finally, 4. measure from the top of the book to the floor. It will also be useful to measure the saddle height (bottom bracket centre to the top of the saddle) on your current bike and compare it against the illustrations.
If you would like a specific illustration showing your current saddle height or based on your inside leg measurement, then click here to send us your measurements in mm and the frame size(s) you are interested in and we will create it and email it to you.