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Ive got a carbon Cube HT. I has the screw together Hope BB with an xt chainset running a NW chainring. I have just gone from 1x10 to 1x11. I have and xt mech and shifter and a sunrace 11-50 cassette. The chainring is the 10sp one i used with 1x10. The chain is a new 11s kmc.
Prevoously the bike was silent and the drivetrain was about 2000 miles old.
The shifting is good, but when i press hard on the pedals there is a lot of drivetrain noise. Is this due to a worn front ring? Or have i missed something?
The cranks spin nicely with no play.
Im a bit mystified....
Ian
Well, that was easy.....its the BB bearings.
Removal of the crankset reveals the NDS is a rusty notchy mess....
So, is it kinetic bearing for them?
Think it's hope OEM only for the BB.
Bum...they are 8mm deep so i think you are right.
I have a new set i have put in, but the noise persists...
The bb has had water standing in it, no drain in a carbon frame. It has made the chainset axle rusty in the areas where it contacts the inside of the bb bearing.
Is this where the noise id coming from? Do i need a new chainset?
Ian
Do you get any noticeable noise / roughness from the chainset spinning without the chain on?
Hard to know without hearing the noise etc. Worn chainring sounds like the obvious one - does the chain sit nicely on the teeth all of the way round (and when you spin).
Oh, and have you threaded the chain through the derailleur correctly - i.e. no rubbing on the little tab between the inner and outer plates.
New 11 speed chain with 2000 mile old chainring that was mated to a 10 speed chain.... Regardless of potential BB bearings, I'd buy a new chainring. I wear chainrings out in less than a 1/4 of that mileage. Depends where and what you are riding though
Chain is threaded correctly, but it wouldnt be the first time id got it wrong...
I have a new chainring so will try that.
Im hoping i havnt made a mess of the chainset spindle by it sitting in damp condition with the bearings.
The chainset spin test seems fine. No moise or other rumble apparent.
The noise only really happens when im pressing hard on the pedals at the 3 and 9 oclock positions.
Without seeing it or hearing the noise I’d say it’s likely to be the chainring. If you’ve gone to the expense of a whole new mech / cassette / chain / shifter I’d definitely not try to reuse a 2000 mile old chainring.
I know it's not fashionable to do so but I'd also try sticking with all-Shimano for the drivetrain. There really is a noticeable difference in noise and shifting.
measure teh bearings and ask a bearing supplier. I recall Hambini said hope bought from NTN or SKF