Once you've got your budget ready, then the next step is finding what size you need. It doesn't matter how much the bike costs or how flashy it is - if it doesn't fit properly, it won't be enjoyable to ride.
Too big, and the bike will be hard to handle, and you'll be stretching to reach the handlebars, making it uncomfortable on your back and shoulders. Too small, and you could end up banging your knees on the handlebars as you pedal. Either way, it's vital to get the size right.
Selecting a size that's too big or too small and thinking 'it'll fit' or 'I can make it work' isn't an option either, as the size of a bike doesn't just refer to the frame – components are quite often scaled to accommodate the rider.
For example, a small bike might come with a 170mm crank; however, on a Large bike, it might come with a 175mm crank instead. It's the same with the stem, handlebars and various other components, so not only will it be an uncomfortable ride, it might cost more money than you think to try to put it right by swapping for smaller or larger components.
Even then, just swapping the components offers no guarantee that it will correct the problem. An overly short or too long stem on a bike can dramatically affect the handling, making it twitchy or slow to respond, which gives a poor ride experience compared to the original bike you bought.
Now we've established the importance of finding the correct frame size, it's time to measure up. For a general guide, take your height and inside leg measurement and apply it to the sizing guide on our website – each bike has a 'what is my size?' link on the product page. Here's an example below;

While we offer a general size guide, we always advise brand new riders to go and try the bike before committing to any purchase. The only way to get a feel for a bike is to ride it, so contact your local Giant retailer, and they will be happy to assist you on your journey into road cycling.