Is this an okay bike for little money $150 - $200can or should i look elsewhere? like a mongoose that has all aluminum frame?

DESCRIPTION
1996 model year

Boulder 520 Giant Bike
Frame: 21" Cro-Moly custom tubing
Tire Size: 26" /w Weinmann aluminum alloy rims
Stand Over Height: 30.5"
Speeds: 21
Gear Shifters: Grip Shift throttle
Front Derailleur: Shimano
Rear Derailleur: Shimano Altus
Brakes: Shimano Altus front and rear
Crank Set: Dotek
Seat: Viscount vinyl seat
Suspension: n/a
Color: violet and maroon combo
Grips: Grip Shift rubber grips
Extras:
- quick-release front wheel
- built-in kickstand
- metal bottle holder


Condition: The bike appears to be in good/used working condition. There's a few visible nicks and scratches on the frame besides that it's still in good shape. Surface rust on some parts mostly on the handle bars but it can be cleaned and oiled. A couple of small tears on the seat but it can be patched (a very comfortable seat). Overall, the bike still rides well with good brakes.



WEIGHT: 15.8 kg


Mongoose
Cobalt blue Mongoose Bike
Frame: 20" aluminum alloy
Tire Size: 26" aluminum alloy rims
Stand Over Height: 30.5"
Speeds: 21
Gear Shifters: Shimano SIS
Front Derailleur: Shimano
Rear Derailleur: Shimano Acera X
Brakes: Shimano V-brakes
Crank Set: Crank Wheel
Seat: Bell two-tone gel seat, has tear at front
Suspension: n/a
Color: Cobalt blue with large print graphics
Grips: rubber grips in good condition
Extras:
- black bell horn
- front reflector light
- quick-release front and rear wheels for easy storage
- lock holder


Condition: The bike is in good/used working condition. There's a few visible scratches on the frame but still looks good with no dents. Some minor surface rust on some parts but it can be cleaned by a rust remover. The rear wheel is missing one spoke and the seat has a small tear on the front. Overall, despite its cosmetics, this is a well equipped bike that still rides and performs well with tight brakes.


WEIGHT: 14.5

Don't know the name might be a giant of some sort

DESCRIPTION


Blue hybid Style Bike

Frame: 21.5"
Tire Size: 25.5" (hybrid style)
Stand Over Height: 31.5"
Speeds: 21
Gear Shifters: Shimano indexed
Front Derailleur: Shimano
Rear Derailleur: Shimano Altus
Brakes: Shimano front and rear - tight
Crank Set: Shimano
Seat: generic vinyl seat
Suspension: n/a
Color: blue
Grips: rubber grips
Extras:
- CatEye bell horn
- Handle Guards
- Quick-release seat post
- Quick-release front and rear wheel for easy storage & disassembly


Condition: The bike appears to be in good/used working condition. There's a few visible scratches and some surface rust on the frame but it can be cleaned and oiled. Other than that, it's still in good shape. The seat has a few small tears but it can be patched. The bike's make is unknown. The make and decals were peeled off. The left handle guard's end cap is missing. Overall, the bike still rides well. Brakes are good, front brake is a bit noisy but may just need some WD40 (still works well).



This bike looks simple but it's packed with great extras and features. It's equipped with Shimano performance parts and it has a light aluminum alloy frame(check the weight). This bike is smooth and comfortable to ride and it's good for those long rides on the trails(touring.)



WEIGHT: 13.8 kg

This Kona is going for $190can is it worth it?

DESCRIPTION


Kona MTB Performance Bike

Frame: 17" aluminum alloy frame(light)
Tire Size: 26" with Mavic aluminum alloy rims
Stand Over Height: 27.5"
Speeds: 21
Gear Shifters: Shimano Decore LX
Front Derailleur: Shimano STX
Rear Derailleur: Shimano Decore
Brakes: Shimano Decore V-brakes front and rear
Crank Set: Shimano IG
Seat: Expedia vinyl seat
Suspension: unknown front suspension
Color: Gray
Grips: Yeti ridged rubber grips
Extras:
- quick-release front and rear tires for easy storage
- Giant corner-sided handle bars
- Shimano DX custom pedals
- Velocity Aluminum alloy handle bar


Condition: The bike is in good/used working condition. There's scratches on the frame especially where the decals were. It seem that the decals were removed by scratching it.Some rust patches on some parts especially the chain but it can be cleaned with a rust remover. But the frame is in good condition with no dents. The front suspension fork was painted badly but it can be repainted. The seat has a few tears but it can still be patched or replaced. Overall, despite it's cosmetics, this bike still rides and performs very well. It's well equipped with performance parts(check description). Has pedals that can be used with or without bike shoes.



This Kona Mountain Bike is equipped with Shimano Performance parts, aluminum alloy frame and rims(very light), and customized handle guards and pedals for that unique style. If you're looking for mid-high end bike that is a bit of a fixer upper, this is the one to get.




WEIGHT: 12 kg