How many chain links do you need on a 20 inch BMX bike?

Answer 1

There's really no telling, it depends on what size your sprocket and driver/freewheel is, and the length of your chainstays.

Chains are always bought a little too long, and then cut to size using a chain breaker tool.

Answer 2

That would depend on the bike, the size of your chainwheels and the size of your rear sprockets, there's no fixed answer. Your best bet is to mosey along to www.bicycletutor.com, www.parktool.com or www.sheldonbrown.com, they will have detailed instructions on how to determine chain length for each individual setup.

Answer 3

No definite answer, will depend on frame stretch and sprocket sizes. Set the wheel in its most forward position, loop the chain around chainwheel and sprocket, cut chain with least amount of slack. connect chain, move wheel backwards until chain is tight enough. Hand crank wheel, check for tight spots, then do the wheel nuts up properly.

Answer 4

There's really no telling, it depends on the size/design of the frame, and the tooth counts on the sprocket and driver.

Every chain is sold a little longer than needed so that it can be cut to fit according to the bike it goes on to. This means that there's no way of telling how many links you'd need w/o knowing exactly what bike you have.