Choosing frame size when still growing I am about to purchase a 2018 Kona Sutra touring bicycle but I need some advice on how to know which is the right size for me.

My measurements are 174cm tall with a 79cm inseam. I was advised that a 52cm size frame was the right size but I am 18 years old and I still have the potential to grow.

On a 54cm frame the top tube almost touches my crotch but I was told that if I were to grow anymore that a 54cm frame would be perfect and now I am left with the decision on which size to buy.
I would go for the bike that fits well today. You can allways increase the saddle height a bit should you grow a bit more. A good fit is very important when it comes to your enjoyment of the bike.

If you do grow, you can get a new bike in a couple of years, if you don't grow you're not stuck with a too large bike.