Good rule of thumb to keep you out of trouble on takeoff: the relationship between TOW and V2.
On the 737-700, the number of tons of your TOW minus 22 should be pretty close to the last two digits of your calculated V2.
e.g 55 (tons) minus 22 = 33, thus expecting V2 of 133.
Work it out for your own aircraft and fly safe...
P