What causes Controller failure causes sudden power loss on the Niu Rqi?

Ride at full speed, check for cutouts or hesitation Estimated fix cost: $150-$350

What causes Brake wear and misalignment common on the Niu Rqi?

Squeeze both brakes, check pad thickness and pull feel Estimated fix cost: $30-$80

Inspect sidewalls closely for cracks or bulges Estimated fix cost: $40-$90

Test full charge range, compare to original spec Estimated fix cost: $300-$600

Known issues to inspect before buying a used Niu Rqi. What to check and how much repairs cost.

SERIOUS

Test full charge range, compare to original spec

Fix cost: $300-$600

SERIOUS

Ride at full speed, check for cutouts or hesitation

Fix cost: $150-$350

MODERATE

Squeeze both brakes, check pad thickness and pull feel

Fix cost: $30-$80

MODERATE

Inspect sidewalls closely for cracks or bulges

Fix cost: $40-$90

☐Check battery cycle count if accessible

☐Test ride uphill for power consistency

☐Inspect frame welds for cracks

☐Verify charger included and working

Decent if battery is healthy, avoid high-mileage units