If you can stretch your budget a little more, go for btwin rockrider 300. Btwin is renowned brand who makes quality products. I personally used btwin rockrider 5.0 and it was solid. if you need gearless model, there is btwin mybike which comes in the range of 6000 rs. If your riding terrain is plain, then this model would be enough. Try to google decathlon noida for address of the store where you can go in personnally and find one that apt you, else you can buy from online store such as amazon.