You can find high-quality bicycle replacement parts at specialty bike shops, online retailers like REI or Performance Bicycle, or directly from the manufacturer of your bike.
You can find a replacement 20-inch bike wheel for your bicycle at a local bike shop, online retailers such as Amazon or eBay, or at sporting goods stores that sell bike parts.
You can find a specialized bike chain replacement at a local bike shop or online retailers that specialize in bicycle parts and accessories.
You can find replacement parts for a Genesis Onyx 29'' cruiser bicycle at bike shops, online retailers, or directly from the manufacturer's website.
Bicycle parts are very rarely specific to a certain make & model. Functionally identical replacement parts will be available from almost any bicycle shop.
You can find replacement pads for your bicycle helmet at most bike shops or online retailers that sell bike accessories.
Bicycle tires can be bought and replaced easily at many biking stores. Bicycle Warehouse, Performance Bike, and Bicycle Tutor all sell replacement bike tires as well as teach one how to replace a bike tire.
Bicycle parts are much more expensive when bought piecemeal as compared to when bought as a complete bike, so usually not much point in buying a bike that will require a lot of replacement parts.
The best way to find a replacement 20-inch bike tire for your bicycle is to visit a local bike shop or search online at reputable retailers that specialize in bike parts and accessories. Make sure to know the specific measurements and type of tire you need for your bike before making a purchase.
You can find a replacement 14-inch bike tire for your bicycle at most bike shops, online retailers such as Amazon or Walmart, or at sporting goods stores that carry bike accessories.
You can find a replacement Schwinn bicycle tube at most bike shops, online retailers like Amazon or Walmart, or directly from the Schwinn website.
You can buy used bike parts for your bicycle at local bike shops, online marketplaces like eBay or Craigslist, or at bike swap meets and garage sales.
You can find a replacement 14-inch bike wheel for your bicycle at a local bike shop, online retailers such as Amazon or eBay, or through the manufacturer's website. Be sure to check the specifications and compatibility with your bike before making a purchase.