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Hello is there anyone that is able to help me? I need to get a new chain for my little boy's quad bike and I'm unsure on what size I need to get.
Its a 50cc mini motor quad bike. I have looked online but says all different numbers of links and the one that is on it already is too small as I bought it off some bloke who didn't have a clue what he was doing.
From a little research it would appear most Mini Moto Bikes & Quads up to 50cc mostly use a 25H or 25E chain. They vary in price depending on retailer but most seem quite easy to buy being a popular item. As we know very little else regarding main drive dimensions (cog / gearing) apart from the fact it should only consist of a main drive gear and a smaller one on the rear axle.
All I can do is attach a chart of the most likely chains and the OP can hopefully work out what chain is required according to the dimensions on the gearing.
First up - confirm that its Roller Chain. There's a metal doughnut roller around each pin in this example:
If it doesn't look pretty close to this, then its not bicycle chain.
Then check if its a bicycle chain. The pitch will be exactly 1 inch / 25.4mm per pair of inner+outer links, with maybe up to 1-2% longer if its worn. This is the same as saying 0.5 inches between adjacent chain rollers/pins.
Any other chain pitch and you're looking at a motorbike chain.
Then move to measuring the width, between the inner plates.
Again if its not one of those two, you have motorbike chain, or possibly something different again.
