It's 1/8" width, but the length is determined by the size of the bike frame, and the size of the sprocket/chainwheel you're using.
inox or chain lube from a bike shop
Depends what size you are im 5 feet 10 and i ride a 20 inch bmx bike
The size of a BMX bike tire with a measurement of 20x2.35 is 20 inches in diameter and 2.35 inches in width.
The recommended BMX bike tire size for optimal performance and control is typically around 20 inches in diameter. This size provides a good balance of speed, agility, and stability for BMX riding.
A BMX bike size chart provides information on the recommended bike size based on the rider's height. It typically includes frame size, top tube length, and wheel size recommendations to help riders choose the right bike for their height and riding style.
There are two measurements to a chain, width and length. Most BMX use what's known as an 1/8" chain. Length, sometimes given in no of links will vary from bike to bike. If two otherwise identical bikes are set up with different sprockets and drivers they will need different chain lengths. Bike chains are always sold too long, and then cut to size. On top of that chains stretch, so the same number of links in a worn chain won't be the same as that number of links from a new chain.
You might have to either lengthen or shorten the chain, depending on if you're getting a bigger or smaller sprocket.
depends the age and size
BMX bikes pretty much all have 20"wheels, which makes all frames very similar in size. On top of that BMX is almost entirely ridden standing up, so bike size doesn't matter as much as it does for road riding for instance.
For someone who is 5'9, a BMX bike with a top tube length of around 20.5-21 inches would be a good fit.
To determine the size of BMX frame you need for your bike, measure the distance from the center of the bottom bracket to the top of the seat tube. This measurement will help you choose the appropriate frame size for your height and riding style.