Excellent and would definitely hire bikes again.
We had 4 hours rental but could of done with more as we didn't scratch the surface of Central Park bur what we did see was well worth it!
saved about 50% by booking this in advance with Viator. We booked the 4 hour slot which was just right. If you cycle round the whole of the outside of Central Park non-stop it only takes about 45 minutes which is really all we wanted to do so we had returned the bikes after about 2.5 hours, but at the price we paid, who cares? Bike shop is about a 5 minute walk from Central Park so very handy. Staff v helpful and friendly. I would highly recommend cycling round Central Park as you get away from all the hussle and bussle of the Big Apple for a couple of hours and with no traffic in the park you don't have to be an experienced cyclist (thank goodness as I hadn't been on a bike for about 10 years!)
Good value for money, best way to see all of Central Park.