The wheel bearings fit into the very centre of the front and rear wheels of current model (manufactured from late-2009 onwards) Mountain Buggy strollers.
Take a look at the wheel on your buggy to identify which type of bearing to order. The wheel bearing you receive may not match the existing bearing on your wheel (we are no longer manufacturing black bearings) - rest assured you will receive what you need if you order correctly! If you are ordering a bearing for your front wheel, ignore the brake cog pictured in the images supplied, these images are of rear wheels and will look different to your front wheel although the bearings are the same.
Bearings are sold individually. Each wheel holds two bearings, if you need to replace both you will need to order two.