Knocking noise driving me crazy!

nathancorrea

I own a 2008 Titus Racer X. When I move the rear wheel side to side with a bit of effort, there's a knocking sound (with vibration) that comes out. This same thing happens when I pedal really hard or even with the bike just stationary, and i push down the crank arm with enough force.

I've done the following:
1. tighten the frame's pivots
2. tighten the rear shock's pivots 3, regreased and tightened BB
3. tightened pedals
4. tightened crank arm bolts, chain ring bolts
5. replaced cogs, same result.

Other notes:
1. i'm 99% sure it's not the wheelset as i fitted another rear wheel but it still has the same result.
2. when i turn the lockout on, there's a noticeable weakness in the knocking noise.
3. the knocking noise starts when i put pressure on the pedal/crank and ends exactly when i put off pressure.

still the knocking noise appears!

when i'm just spinning, not mashing, there is no sound. the sound appears when enough power is applied to the pedals. the sound also appears when i move the rear wheel side to side with enough power.

what's your 2 cents guys??

ricardo_smooth

Rear shock bushes perhaps? How long have you had the bike?

The Rookie

List of things to consider
1/ Rear QR
2/ Bushes/bearings (if they are knackered, tightening the bolts will not unknacker them!)


To clarify, what is a weakness in the knocking
How does a knock continue while you have pressure on the crank arm, a knock is surely a one off noise/feeling that doesn't carry on (like a hum would for example).

peat

Seat post. Always the seat post.