Mountain Bike Rear Derailleur Adjustment

Witch Bicycle will last longer, and support me the best?
1. Power X Men’s 26″ Bicycle:
# 18-Speed Shimano Grip Shifter Gearing System
# Over-sized dual-suspension steel frame
# Alloy Brake Lever with alloy linear-pull brake
# 3-piece cranks and alloy rims
# Plush MTB style seat with alloy quick-release for height adjustment
2. Roadmaster Granite Peak 26″ Men’s Mountain Bike:
* Steel frame
* Suspension fork
* 18 speeds with SRAM grip shifters
* Shimano rear derailleur
* Comfortable padded saddle
* Linear pull brakes
* 26″ alloy wheels
* Dimensions: 68″L x 23″W x 41″H
Or will thay both last as long and support me.
I am 250-260 and 6’2.
Both bikes are guaranteed to break down in a short period of time. These are bottom end bikes sold by big box stores. They sell the lowest quality available. Sorry if I sound too harsh. They’re also mainly “one size fit’s all “.
No, they won’t last. Want a real bike, go to a real bike store / shop.
How to Adjust a Rear Derailleur – Mountain Bike (www.fezzari.com)

