JSCM Sport Aluminum Electric Dirt Bike Rim Set For Modified Jifeng Model

The Qilong Jifeng wheel set is 1.6×21 in the front and 2.15×18 in the rear. This configuration is a modified Jifeng model. The following is a detailed analysis:

Advantages of the front 21-inch:
- Passability↑: Large diameter wheels can easily crush obstacles such as rocks and tree roots.
- Stability↑: Long suspension travel with high front wheel, suitable for high-speed off-road.
Advantages of rear 18-inch:
- Traction↑: Wider 2.15 wheels can be installed with large-tooth off-road tires such as 120/100-18.
- Compatibility: Common with the rear wheels of most professional fuel off-road motorcycles (such as KTM EXC), with rich accessories.
3. Modification precautions
(1) Parts that must be adjusted
- Front shock absorber: The original 19-inch front fork travel may not be enough, and a longer travel shock absorber (such as DNM Volcano) needs to be replaced.
- Rear flat fork: The 18-inch rear wheel may need to extend the flat fork or adjust the chain length (the original rear flat fork is suitable for 16 inches).
- Brake system: After the wheel diameter is increased, it is necessary to confirm whether the brake disc diameter matches (usually retain the original 220mm).
(2) Tire recommendations
- Front wheel: 80/100-21 (such as Michelin Starcross 5 or Dunlop Geomax MX33).
- Rear wheel: 110/100-18 or 120/100-18 (such as IRC VE33 or Pirelli Scorpion MX).
(3) Performance impact
- Acceleration↓: Large wheel diameter increases moment of inertia and motor load increases slightly.
- Endurance↓: Tire resistance increases and endurance decreases by about 10-15%.

Upgrading to 21/18 wheels: Suspension/chain modification is required, suitable for professional off-road players (it is recommended to directly choose Storm Bee for peace of mind)