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Help!
I’ve spent the last few months building up a new Giant Anthem frame and I can’t get out and ride it because there is a horrible graunch every time I put power down through the pedal stroke. It seems to align with each foot forward and pushing down. I can’t replicate it with the bike stationary or when not pedalling. It happens if I’m seated or standing.
It’s a 1x setup and so far I have swapped out the crankset and chainring, pedals and rear mech. All of these are used but have worked fine on other bikes. Bike shop have just replaced the new press fit bottom bracket with a new one. Cassette and chain are new. Rear wheel is new.
What to do next? I don’t have another 27.5 boost wheel so can’t swap that easily, but I’m struggling to see how that could be causing it. I’ve never had a full suss frame before, but it doesn’t seem to be pivot related as far as I can tell.
I’ve built loads of bikes in the past and never got this stuck so would appreciate any thoughts of possible causes.
Mike
When I set up my 1x10 there was a definite grinding sound for a couple of rides. I assumed it was the new wider chain ring bedding in to a new chain. After 20 miles or so the sound went and I have had no problems with the transmission since.
Yes I’d wondered about new chain on old chain ring, but had hoped that trying two different ones might have shown something different but it could still be that. Doesn’t seem to vary across gears, other than the amount of force I’m putting into the pedals. Might try a new chainring when I can get one ordered. Might just ride it through some gritty mud for a bit to wear things in like you suggest. I’m just a bit worried about damaging something further.
Mine was loud constantly and more so under load. I put it together and went for a ride without really checking it so I had no choice but to carry on. I sure someone with great knowledge will be along shortly to provide an answer.
Tried riding it to bed in yesterday to no success.
Fitted the new Superstar chainring just now and its running super smooth.
Turns out both of my old rings were too worn. Maybe time to change on my other bike too!
Was going to say chain ring worn. Happens on a fixed gear bike if running 'evens' on the chain ring and sprocket - if you then say remove the wheel having not been taken off for a while, and the chain moves along 1 tooth, it sounds like a tractor. A single chain ring will wear to the chain, then when a new one goes on it won't mesh well.
Good to hear you've sorted it!
Cheers!