Get your replacement lawnmower wheels from Kmart
There is nothing more frustrating than trying to use your lawnmower with a broken or malformed wheel. And there is nothing easier than getting a replacement wheel, or set of wheels, for your mower.
Most manufacturers claim that unless you use their branded parts and have your mower serviced by an authorised mower repairer, you will void your warranty. While this is true it doesn't apply for wheels. So, instead of buying them through a lawnmower dealer it's usually much cheaper, more convenient and quicker to purchase them from your local Kmart.
What's more, Kmart usually stocks most of the common brands anyway or they have unbranded wheels that will fit generic sizes. It may, however, be harder to find specific sizes for most rider mowers but you should be fine with your push mower.
If you can't find the specific wheel from Kmart your next best place to check is your local hardware store. They may carry different brands to Kmart as they usually have their own brand lawnmowers. Regardless, they may have something that fits and could possibly work better than the broken original.
Finally, if you still can't find the wheel that your after it will usually be available at an authorised dealer outlet. If they don't have it in stock you may be able to order one and have it soon enough anyway.