Mind Boggling Problem

[John planet x]

Yo, just fitting my bike together, got a new set up you see.

Got a king rear hub now, and stuck wheel on set up the gear for single speed. its 20-16 (too heavy ima change to 17). Everything looks and seems ok until i ride.

This is what happens:

When i put pressure on my left pedal, at a very certain point i feel and hear a clonk. Every time.

I can put pressure on my right pedal n all and feel n hear nothing its always my left side at 1 point.

I've narrowed a few things down. It cant be the hub itself, as the it is never at the same point of engagement and wheel is never in the same place when applying the pressure. The pedals are new, so wont be those. Everything is tight and in place properly as i can see witht he cranks and bb.

The only thing that i can think of is the rear or front chain ring, at a certain point is being irratated with the chain. This is the only thing that stays constant too, because the change ring is always at the same place with the cranks etc.

Maybe some slight chain suck at one point ?

Hope i am not too confusing, it probably makes more sense to me than anyone else. But if you could try and help i'd appreciate it.

edit

Oh and the chain cogs etc aint new, the rear cog was not running with the chain and front cog before change. But the chain and front cog where running together

Edited December 13, 2005 by John planet x

[Tom Booth]

You sure your left crank arms not slightly rounded....Could cause a clonk??i know myold onza's did clonk when they rounded.

Tom

[Smo™]

Check the pedals are done up tight too.

[John planet x]

both tight, was working all fine before i changed the wheel :/

[Clarky]

my left hand middleburn uci isis has been rounded by prevouis owner and it has slight movement maybe its that.

Clarky

[Will Arnold]

both tight, was working all fine before i changed the wheel :/

then the only other thing is the pedals? what are they? if they are loose bearing pedals it could be those?

[John planet x]

Brand new v8's. Was thinking it might of been chain suck on a certain point 0_o ive rode the bike before with pedals etc was fine

The noise is hard to explain, its when the crank is about 45 degrees pointing down, its a clonky grunty weird sound 0_o

Will have to inspect it tomorrow more :@

[Urpedigreechumdog]

Loose bb, i've had that problem, you turn the crank so far and hear a clonk cos the loose bb has made the chain come out of allignment.

[IOLO]

sounds like your chain line.. or mech/tensioner alignment. to me

iolo.

[stubert]

the only time ive had that "clonk" at the same point every turn its been my bottom bracket was slightly loose. Hold both ur cranks and wiggle them holding the frame hard with your knees, if you feel the cranks moving together then your bb is loose.

if this dosnt happen then..........who knows......

[Urpedigreechumdog]

the only time ive had that "clonk" at the same point every turn its been my bottom bracket was slightly loose. Hold both ur cranks and wiggle them holding the frame hard with your knees, if you feel the cranks moving together then your bb is loose.

That's what i was trying to say, but i'm too tarded to put it in words you can comprehend lol.

Edited December 14, 2005 by Urpedigreechumdog

[ian]

have you checked your chain for siff links?

is it running ok thorugh your mech or tensiner?

[John planet x]

have you checked your chain for siff links?

is it running ok thorugh your mech or tensiner?

everything running through mech n all fine, i just tested my cranks/bb there and there is like a very very very very very small amount of movement? could this be the cause? ima put on my other wheel to see if it happens with that.

[Urpedigreechumdog]

Yup, it'll be that tiny bit of movement. That's the problem i had last weekend. Seems petty but that's the problem.

Edit: double the postage

Edited December 14, 2005 by Urpedigreechumdog

[John planet x]

just back after trying different wheel. problem still there, must be the bb or cranks maybe. thanks mate.

[Brisa]

John, you want me to call up after tech with a bb tool?

[John planet x]

if you wouldnt mind mate

[skandy32]

well.... if the clonk is at the same point everyrevolution, it cannot be anything to do with the rear end of the bike.... e.g. hub, derailer, tensioner, chain or whatever.

So it must be either pedals, cranks, bb or chainring? Stuff at the front end.

nobody has mentioned chainring yet....! check all the teeth etc?

apart from that i'm outta guesses....

good luck

[ZeroMatt]

The way to fix this would to just lube everything remotely associated to the drivetrain, allways works for me

Edited December 15, 2005 by ZeroMatt