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Grinding noise - Moving Sprocket and crankset - Need to replace bearings?

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Grinding noise - Moving Sprocket and crankset - Need to replace bearings?

Old 09-12-07, 08:29 AM
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Grinding noise - Moving Sprocket and crankset - Need to replace bearings?

Hi There,

Ive been riding my older bmx bike (bought it 5 yrs ago) now for about a month, once/twice every week for 2-3 hrs and going to my local bike track and jumping (albeit slightly off the ground ) - just recently started riding again.

It seems as though now my whole crank set and sprocket move about 1cm side to side. Ive also noticed now (after Saturdays ride) that if i push down on the right hand pedal(to pedal fast) its making some sort of crunching/grinding noise which probably isn't good . This doesn't happen when i just pedal normally.

So, Can anybody shed some light as to what ive gotta do to make it go away ? I can honestly say it doesnt affect the ride at all atm its only become 1/20th harder to pedal as it seems as though theres some bad friction going on.

Im going to take the bike apart soon for educational and greasing purposes so what should i be looking to change ? I went to my local bike shop and they said (this is before any grinding happened) that i needed to replace my bearings on the crank and after watching a how-to build a bmx bike video on youtube, i now know what ive gotta replace and it seems fairly straight forward.

My shop wants $6 for bearings and $30 for labour, might aswell save some money and learn something, heres a pic to give u an idea as to what my setup is. also, i dont mind spending a bit of money on the old bike because i intend to keep it for a fair while for my nephew and the frame ( i think) is really strong and will last for heaps long.

if it helps, im 5'11 and weigh 100kg lol

Thanks

Pic:

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Old 09-12-07, 09:32 AM
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Try tightening your cranks. A simaler thing happened to my Mosh a few days ago.

And just in case that's not the right name here are some pictures.

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