BMX - A few noob questions...

Well first off i want to say whats up to everyone here. Now for the questions i just bought a Standard STA off a friend for 150 bucks it is semi beat but it will work. The question i have about it is why does it have a smaller diameter tire in the rear then the front?
Thanks
Erik

Ok now that im putting the bike together i grabbed a crank off a friend and i dont know if it will work. i have put everthing together and it is really really close to my rear brake. The crank feels pretty stiff to turn, is there something that i did to make it this way?.....im sorry for all the questions im just used to working on my mountain bike this is all new to me

With regards to the tyres, front tyres are generally wider, because it offers more grip during cornering (ditto if it's a knobby), but rear tyres are narrower (and smoother) because they have a smaller rolling resistance so they slow you down less.

As for the crank, if it's a three piece, did you put the correct spacer between the bearings? There are two widths, only a millimeter or two's difference, but it is ctritical you get the right one, otherwise you'll be putting undue strees on the bearings which will kill them real quick. If it's a one piece or has open cage bearings, you may have just tightened the cones too much. I would also suggest you put in a few spacers to move the arms away from your brakes.

Thanks for the quick response it is a 3 piece. I have a spacer and a washer type object on the same side as the sprocket and nothing on the other side. I think that is causing me issues. I can see metal shavings on the non sprocket side from metal on metal........i hope you are following what im saying