Sprocket on a BMX bike? HELP! :D please?

chris w

New member
Hey,
I have a bmx bike which i don't know the name of because it was a custom build off of ebay and the sprocket that came with it was a cheap crappy one and it has cracked and everytime i ride it then the chain comes off. I want to get a new sprocket preferably metal if you have any recommendations but I'm not sure if it will fit. Does the amount of teeth on a sprocket help or do anything and do all sprockets fit every bike?

In particular do any of these fit every bike?
If they all do what would you say is the best? :)
Thanks! :D
The links are down there somewhere :)

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=380204136481&_trksid=p2759.l1259#ht_657wt_939

http://cgi.ebay.co.uk/DIAMONDBACK-BMX-Bike14T-Freewheel-cog-sprocket-M3Thread_W0QQitemZ170437390642QQcmdZViewItemQQptZUK_sportsleisure_cycling_bikeparts_SR?hash=item27aedc3132#ht_500wt_956

http://cgi.ebay.co.uk/CHROME-Freewheel-BMX-Sprocket-16t-NEW-NOS-Old-School_W0QQitemZ130355949180QQcmdZViewItemQQptZUK_Bikes_GL?hash=item1e59d1ee7c#ht_500wt_956

http://cgi.ebay.co.uk/GUSSET-TRACK-COG-fixed-wheel-sprocket-18T-3-32_W0QQitemZ250563502698QQcmdZViewItemQQptZUK_sportsleisure_cycling_bikeparts_SR?hash=item3a56bfa26a#ht_594wt_1165


Sorry it may seem a dumb question but I'm new at all this bike fixing stuff :/ :(

Thanks if you can answer :)
Is it possible to get a sprocket for a bmx for £10 or under? :/
 
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