RDLN Gear Set 17/49; 139QMB
RDLN High-Speed Gear Set (17/49) – GY6 50cc / 139QMB
$38.10
10 in stock
*Note: Free shipping to U.S. mainland (excludes AK, HI, and territories)
Orders placed by 1pm EST on weekdays ship the same day.
Product Details
Description
RDLN High-Speed Gear Set (17/49) – GY6 50cc / 139QMB
Specifications
- Width: 12cm||Gear Height: 8cm||Final Drive Gear Ratio: 2.88 (stock is normally 3.41 – 3.71), meaning less torque, but higher acceleration||||NOTE:| This requires pressing the gears off the shaft.|||Compatibility: |This product fits 50 – 100cc 139QMB engines and those engines with the following codes. |||139QMB-based 50cc / 80cc engines with the following engine codes:||||||139QMA||139QMB||1P39QMB||1P39QMA-2||||YN139QMB||JJ1P39QMB||139FMA-2||BD1P39QMB||||BN139QMB||147QMD||Other QMA models||Other QMB models||||||Don’t see your engine listed? If the engine code includes “QM” or “FM”, this product is compatible with your vehicle.||||About RDLN:| RDLN is a premier line of aftermarket performance upgrade systems and components for scooters. RDLN products are engineered to significantly improve the function, performance, and reliability of your vehicle with the ultimate goal being an optimal balance of price, power, and performance. RDLN’s extensive field-testing network ensures each product exceeds customer requirements and expectations every time. RDLN delivers full-throttle performance at uncompromised quality.||This product is intended for off-road use only.||This product is not intended for use on public roads or land.||This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.|||*Performance upgrades are considered racing parts and are not covered by warranty.||||
- Height: 8cm||Final Drive Gear Ratio: 2.88 (stock is normally 3.41 – 3.71), meaning less torque, but higher acceleration||||NOTE:| This requires pressing the gears off the shaft.|||Compatibility: |This product fits 50 – 100cc 139QMB engines and those engines with the following codes. |||139QMB-based 50cc / 80cc engines with the following engine codes:||||||139QMA||139QMB||1P39QMB||1P39QMA-2||||YN139QMB||JJ1P39QMB||139FMA-2||BD1P39QMB||||BN139QMB||147QMD||Other QMA models||Other QMB models||||||Don’t see your engine listed? If the engine code includes “QM” or “FM”, this product is compatible with your vehicle.||||About RDLN:| RDLN is a premier line of aftermarket performance upgrade systems and components for scooters. RDLN products are engineered to significantly improve the function, performance, and reliability of your vehicle with the ultimate goal being an optimal balance of price, power, and performance. RDLN’s ex
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 50cc, 80cc, 100cc, GY6
- Engine Code: 1P39QMA, 1P39QMB, 139QMB, BN139QMB, YN139QMB
- Fits Models / Common Applications: Lance and other compatible models may apply.
- Fitment Notes: Performance
Fitment Guide: This compatibility information is based on manufacturer and supplier data. Listed models are common known applications and may not include every compatible scooter. If your scooter has multiple versions or production changes, confirm the correct match before ordering. Check photos, measurements, original part numbers, engine code, model, and related fitment information whenever possible.
Common Fitment Questions
Q: Will this fit a 1P39QMA engine?
A: This SKU is listed as compatible with 1P39QMA engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Will this fit a Lance?
A: This SKU is listed with Lance model fitment where the scooter also matches the listed engine or fitment notes.
Q: Is this for 50cc scooters?
A: This SKU is listed with 50cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 0.8 lbs |
|---|
| Condition | New |
|---|
Is your 50cc 139QMB engine revving at its limit without a higher top speed? The RDLN 17/49 Performance Gear Set changes your final drive ratio from the stock 3.41–3.71 down to 2.88, allowing your engine to push the bike faster at lower RPMs. Depending on your engine mods and rider weight, this gear set can net up to 7+ MPH of top-end gain. It's also the essential final step for scooters running 72cc, 80cc, or 100cc big bore kits — eliminating the over-revving that comes with stock gearing on a bored engine.
Key Features
- 2.88 Final Drive Ratio: Down from stock 3.41–3.71 — up to 7+ MPH top-end gain.
- Ideal Big Bore Pairing: Eliminates over-revving on 72cc, 80cc, and 100cc kits.
- Forged and Hardened Steel: Precision-cut to withstand increased torque of performance engines.
- Balanced Configuration: 17/49 delivers the best acceleration-to-top-speed balance for the QMB139 platform.
- Reduces Cruising RPMs: Improves fuel economy and long-term engine wear at speed.
- SKU: 1200-1283
- Teeth Count: 17T pinion / 49T large gear
- Final Drive Ratio: 2.88
- Weight: 540g
- Material: Forged hardened steel
- Installation: Requires hydraulic press
Fits 139QMB / 1P39QMB engine cases found in nearly all 50cc 4-stroke Chinese scooters, including engines coded:
| Category | Engine Codes |
|---|---|
| Standard GY6 50 | 139QMA, 139QMB, 1P39QMB, 1P39QMA-2 |
| Extended Codes | YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD |
| Popular Brands | TaoTao, Wolf, Bintelli, Ice Bear, Kymco (select 4T), SYM, Lance, and more |
Installation Note: This is not a drop-in part. A hydraulic press is required to remove old gears from the secondary shaft and press the RDLN gears on. Professional installation is strongly recommended.
