At that weight, you're beginning to push things a bit. Plenty of bikes will hold up for casual riding, but going over a curb too fast or things like that can certainly break things.
First off, I suggest you look for a rigid, steel frame mountainbike.
You might be tempted to go for a suspension bike, but the good stuff, like air/oil suspension won't be rated for your weight.
On top of that, rigids are cheaper anyhow.
Make sure the frame is big enough for you. Lighter people can run long stems and long exposed seat posts. For you, that's not ideal.
For comfort, fit the widest tires that frame/fork can take. Something like Schwalbe Big Apple comes to mind.
Next thing is wheels. Look for 36 spoke(or more), and wide, beefy rims. For casual riding, pretty much any 36H front wheel will do. Rears are trickier.
If you want external gears, see if your budget allows for a 40 or a 48 spoke tandem rear wheel. Or go for one with internal gears or a single speed. Wheels w/o external gears are inherently stronger, so a sensible choice if you want to stay within the easier available 36H.
And do try to shop from a reputable, local dealer. Dedicated riding at your weight will require better-than-average stuff, which takes some skill to source and put together.
The best bikes for a 250 lbs woman are typically sturdy and durable models such as hybrid bikes, cruiser bikes, or mountain bikes with a higher weight capacity. These bikes provide better support and stability for heavier riders.
260 grains is equal to 0.037 pounds.
Bikes with sturdy frames and higher weight capacities, such as mountain bikes or hybrid bikes, are best for a 250 lbs man. Look for models with wide tires and strong wheels to support the extra weight.
a male can get up to 400 lbs and a female can grow up to 180-260 lbs :)
4 lbs. 1 oz.
Females weigh 200-260 lbs. Males normally weigh 300-550 lbs, but can reach 600 lbs.
A wildebeest calf typically weighs between 19-29 kg (42-64 lbs) at birth.
A 1-1½" needle is recommended in women weighing 152-200 lbs (70-90 kg) and men weighing 152-260 lbs (70-118 kg) SOURCE: http://www.immunize.org/catg.d/p2020a.pdf
About 260 HP and 250 lbs. torque.
260 HP 300 Ft/Lbs TQ
There are several versions of fit bikes, and they all have different weights.
192 ft/lbs or 260 NM