bad vibes.

so, ive just changed my chainwheel from 46t to 48t. and got myself a new chain.

been getting a vibration through the crankarm, the right side , the one the chain ring is attached too.

at first i thought it might just be the chain needing to break in or something. but , after a couple of hours ride today , it was still happening. ..... just put the old 46t back on , just to see what would happen and .... no vibration.

both chainrings are brev m . why would i be getting a vibration on the 48t ?

got me a reet bit peeved .

Is the 48 chainring new? Sounds like bent teeth to me. Does it vibrate at the same point? If so, check for a mis-aligned tooth.

this is the kind of mystery that makes me want to get the bus.

could the bigger ring be rubbing against the chain stay?

no wonky tooths. brand new chainring.

checked the clearance before initial instillation.

????????????????????

from your account it appears you have a worn chain and sprocket and a new chain

a worn chain will not fit so well on the new chainring

Chain's too tight.

This should fix it.
http://www.youtube.com/watch?v=nC2gZMNkyJo

this is the kind of mystery that makes me want to get the bus.

The Mystery Bus?

ok.

old chain. old chainring. - no vibration.

new chain, new chainring - vibration.

new chain , old chainring - no vibration.

when i first put the new chain and chainring on. noticed the vibration. first thing i did was to slacken the new chain off.

have you checked for the beach boys?

dies

what size cog do you have at the back?

17t. it happens on both the fixed cog and when ive flipped my flop, on the freewheel. wich is also 17t.

bigger ring - less teeth engaged on the cog - vibration perhaps (in theory)

either that or the chainring isn't exactly straight, i.e. a tiny bit off.

Chain's too tight.

first thing i did when i felt it. but not enough, cos ...............

set it up again today. determined to get to the root of the problem, with the chain super slack.

i am a tad embarrased.

oh well.

cheers everyone!!!!

thing is , its currently on the freewheel side.

if i put it on the fix side, set the chain up with the correct tension and the vibration comes back.................

aarrgg.

chainline?

aaarrrgggg

no, he's asking if the chainline is not correct, not for a pirate impression you heartie.

46-17 is perfect anyway. Go back to what you had and forget this whole sorry saga before it's too late...

loose chain ring bolts?

absolutely not.

whilst browsing velo shop . com. i read that azumi standard track chains are regarded as noisy and heavy. could the vibration im feeling just be the chain needing to bed in ? or should it be super smooth straight from the start?

46-17 is perfect anyway. Go back to what you had and forget this whole sorry saga before it's too late...

wisdom is something you get through experience.

i have a lot of experience.

still waiting for the wisdom to happen.........................

bigger ring - less teeth engaged on the cog - vibration perhaps (in theory)

^

I ride a Moulton, which required a 58t chainring to compensate for the small wheel, and it's quite noisey at smaller cog.