Made by one of the large manufacturers.
eBay
22×11×5.5cm Stable Bike Trainer Training Stationary Indoor Cycling Bike Front Wheel Fixing Frame Front Wheel Riser Block Holder
Aliexpress UK
Wheel Bearing for Yamaha PW 50 1981-2014 Front Left Koyo.
eBay
1.40-10 1.85-10 Front and rear wheels Black Front & Rear Iron Wheels Rims for Honda CRF50 XR50 Pit Dirt Bike Motorcycle Parts
Aliexpress UK
eBay
20/26" Winter Snow Mountain Bike Wheel Set 26x4.0 Fat Tire Front Rim 80mm 32H/36H with Snow Front Wheel 2-Sealed Bearings
Aliexpress UK
Yamaha genuine part Fits models listed above but maybe not all years and variants.
eBay
Wheel Front Drum Brake for INOKIM OX QUICK 4 Electric Scooter Wheel Kit Front Drum Brake and Swing Arm Replacement Parts
Aliexpress UK
eBay
Front or Rear Super Grip Road Wheel Slick Tyre Racing Slick Tire Set for 1/5 MadMax HPI Rofun Rovan KM Baja 5B Rc Car Toy Parts
Aliexpress UK
CG50U 1988 50 CG50 Riva Scooter. CG50W 1989 50 CG50 Riva Scooter. QT50F 1979 50 QT50 Yamahopper Scooter. QT50G 1980 50 QT50 Yamahopper Scooter. QT50L 1984 50 QT50 Yamahopper Scooter. QT50N 1985 50 QT50 Yamahopper Scooter.
eBay
BAFANG Wheel Hub Motor 48V 1000W 750W 500W Fat tyre Electric Bicycle Front Rear Disc Brake Conversion Kit 27.5 700C 20 26 eBike
Aliexpress UK
THIS IS A NEW FRONT OR REAR TYRE ,TO FIT BIKES LIKE THE YAMAHA PW50..THESE TYRES ARE RARE NOWADAYS CHINESE TYRE WITH KINGS INNERTUBE .THE KNOBBLES ON THESE TYRES ARE NOT REALLY BIG,LIKE THE MORE EXPENSIVE DUNLOP OR MICHELIN TYRES ,BUT THEY ARE BETTER THAN A WORN OUT OR BALD TYRE .THE PRICE IS FOR A TYRE, AND AN INNERTUBE.
eBay
Motorcycle Front Rear Wheel Mudguards Fender For Segway X260 X160 For Surron Light Bee X & Light Bee S Electric Bike Refit Parts
Aliexpress UK
eBay
Electric Bike Motor 48V 52V 2000W Front and Rear Brushless Non-gear Hub Motor Wheel for Ebike Conversion Kit and Scooters
Aliexpress UK