Originally Posted by
Russ Roth
You need to give a lot more info. What's the bike, how old, do you have pics? If you have an 1 1/8" head tube a front brake will be easy. Rear isn't usually though trek made an adapter to some of their bikes from the 00s. Most won't have this option but no clue without a lot more info.
Sorry for late reply. It a normal single speed bike. It one year old and I have pics