Q. I am 51 years old. My daily travllaling is 50/60km in city. I have back problems. Which bike should I buy Intruder, Avenger, FZ 25 or Suzuki SF 250?

You are 51 year old so intruder looks does not suits you as well as it build is of plastic which is prone very easily to damages ,while fz sitting position is not for 50km ride yet handling is good and in avenger the comfort is very good handling mileage pickup seat cushion as well as classy look suits the riding of 50kms ,rest of all is your wish and personal requirements

Avenger street is best for City use and also long hauls. Negate the critics, is totally wrong and pointless reviews. Very underrated bike but I'm really happy I actually bought the Street even after seeing all the negative reviews. I felt very lucky that the bike turned out to be nothing like the negative reviews.

Regarding the back problems that you have mentioned there's no better ride comfort that can be provided by any other bike as much the avenger series provide. You should surely go for Bajaj's avenger.