JMCHstore Mini Bike Seat Spring Kit for Monster Mega Moto MMB80 MMB105 — Black 3.5mm Bracket, Heavy-Duty Springs

JMCHstore's upgraded seat spring kit replaces the stock seat mount to add spring-based shock absorption and stronger support for Monster Mega Moto MMB80/M MMB105, Coleman RB100, and similar mini bikes.

If your mini bike bottoms out on bumps or the factory seat feels rigid on uneven trails, this complete seat spring kit is a direct replacement option designed to improve cushioning and durability. The kit combines a 3.5mm thick weight-bearing bracket with heavy-duty springs and mounting hardware so you can transform the ride quality without replacing the entire seat assembly. Although the set is engineered for several popular 80–105cc models, it requires minor seat modification during installation.

How does the kit improve comfort on rough terrain?

The springs sit under the seat to absorb road shock and reduce rider fatigue over bumpy surfaces. Instead of transmitting every jolt to the rider, the spring mechanism compresses and rebounds, smoothing out impacts for a more controlled feel.

• High-strength coil springs tuned for mini bike weight ranges
• 3.5mm thick support plate spreads load and prevents flex
• Reduces vibration transmitted to hips and lower back

Which bike models are compatible with this seat spring kit?

This kit is built to work with Monster Mega Moto MM-B80 (80cc), MM-B105 (105cc), Coleman RB100, and FRP GMB100 99cc mini dirt bikes. Its universal-style bracket and hinge pieces match common mounting points, but confirm measurements before fitting.

• Designed for Monster Mega Moto MMB80 and MMB105 models
• Compatible with Coleman RB100 mini bike frames
• Works with FRP GMB100 99cc 3hp mini dirt bikes with minor trimming

What does installation involve and what modifications are required?

The kit includes the hinge plates, seat support plate, springs, and all fasteners needed for assembly. Installation requires removing the seat’s front and rear plastic clips; trimming or sawing these clips off lets the new bracket mount flush. Basic hand tools and a short saw are the only extras typically needed.

• Complete hardware set included for a single-seat conversion
• Small seat modification: remove front and rear plastic clips with a saw
• Simple bolt-on installation once seat clips are cleared

How durable is the conversion and what weight does it support?

The kit uses a robust 3.5mm thick, weight-bearing bracket and reinforced springs to handle regular off-road use. It’s rated to reliably support riders up to about 180 lbs (approximately 82 kg), offering long-term stability when properly installed and maintained.

• 3.5mm thick bracket resists bending under load
• High-strength springs retain shape after repeated compressions
• Corrosion-resistant finish on metal parts for longer life

Who is this for: Riders who own Monster Mega Moto MMB80 or MMB105, Coleman RB100, or similar 99–105cc mini bikes and want a straightforward upgrade to seat comfort and shock absorption. It’s ideal for commuters who encounter uneven pavement, weekend trail riders seeking reduced fatigue, and DIY mechanics comfortable trimming seat plastics and using basic tools. If you need a factory-style replacement that adds cushioning without a full seat rebuild, this kit offers a practical balance of comfort, strength, and affordability.