JMCHstore Upgraded Seat Spring Kit for Monster Mega Moto MM-B80/MM-B105, Coleman RB100 — 3.5mm Bracket & Heavy-Duty Coil Springs

JMCHstore's upgraded seat spring kit replaces a rigid mini-bike saddle with a sprung cushion assembly designed to absorb bumps and improve rider comfort on Monster Mega Moto, Coleman RB100 and similar mini dirt bikes.

This kit supplies the metal hinge plates, seat support plate, heavy-duty springs and all mounting hardware needed to convert an OEM plastic-mounted seat into a sprung seat. It’s built around a 3.5mm thick weight-bearing bracket and high-strength coil springs to stabilize the rider and soften impacts on rough terrain. Installation requires minor trimming of the factory seat—removing front and rear plastic clips—so it’s ideal for someone comfortable with simple seat modification and basic tools.

How does the spring kit change the riding feel?

By placing steel springs and a reinforced support plate beneath the saddle, the kit introduces progressive shock absorption that reduces direct jolts transmitted to the rider. That results in a smoother ride over ruts, rocks and uneven pavement without altering the bike’s geometry.

• Coil springs cushion vertical impacts and rebound smoothly.
• 3.5mm support bracket prevents flex and maintains seat alignment.
• Improved comfort over longer rides and off-road sections.

Which models and engines is this seat kit compatible with?

This kit is specified for Monster Mega Moto MM-B80 (80cc), MM-B105 (105cc), Coleman RB100, and FPR GMB100 99cc 3hp mini dirt bikes. Compatibility focuses on common seat footprint and mount positions; slight variations may require additional trimming or adjustment.

• Designed for Monster Mega Moto MM-B80 and MM-B105 models.
• Fits Coleman RB100 mini bike seat configurations.
• Works with FRP GMB100 99cc 3hp models with minor fit tweaks.

What does installation involve and what tools will I need?

Installation includes removing the stock seat clips, positioning the hinge pieces, attaching the seat support plate and bolting the springs in place. You’ll need basic hand tools and a saw or rotary cutter to remove the front and rear plastic clips on the original seat for proper fitment.

• Includes all hinge components, support plate and mounting hardware.
• Requires cutting/removing OEM plastic clips—simple saw work.
• Basic tools: screwdriver, socket set, saw/rotary tool, and wrench.

How strong is the kit and what rider weight does it support?

The bracket is 3.5mm thick and the springs are high-strength steel, engineered to support at least 180 lbs (approximately 82 kg) reliably. The construction prioritizes durability and stable seat position under load.

• 3.5mm thick weight-bearing bracket minimizes flex.
• High-tensile springs maintain performance over repeated use.
• Rated to support riders of roughly 180 lbs and similar loads.

Who is this for: Riders who want a tangible comfort upgrade for short-track and trail riding on small-displacement mini bikes, owners of Monster Mega Moto, Coleman RB100 or FRP GMB100 models who don’t mind a quick seat modification, and DIY mechanics seeking a durable, easy-to-install cushioning solution. If you prefer a soft saddle out of the box, this kit offers a mechanical way to reduce vibration and impact without replacing the entire seat or frame.