This is plaguing me since beginning of the year.
It comes by itself, lasts weeks then it goes by itself. And some time later, it's suddenly back. Last occasion it ceased a couple months ago. Since yesterday it's back.
Before yesterday there wasn't an apparent reason for its start.
Yesterday after I came home without experiencing anything along the road also not when arriving back. Some half hour later when I unloaded the bicycle it almost felt over, I wondered but I didn't check at the time. But hours later, when deciding to put the bike inside, I noticed the rear tire was entirely flat. Punctured 1 cm out of the center by a 2 cm long flathead nail, that looked like new (no rust, not bent, alike a nailgun just shot a new one in).
After removal and check I replaced the inner tire.
First ride after, that hated noise was back.
In the past I stopped dozens times along the road to try to locate the cause, for no result.
- When putting the bike upside down, and spinning the wheel, nothing is heard so the contact that produces the noise must be caused under the weight of bicycle and rider.
- There is plenty clearance in all directions around the outer tire - nothing comes close enough.
- I've learnt how to tru the wheel sideways (I put folded paper between a brake pad and the rim) and perpendicular (if that's the right word) with as reference an english key held close against it and stabilized along the luggage frame. In the past and today I succeeded truing it like that, but despite spending half an hour today along the road to tru subsequently finer, when I jump on the bike and ride away the noise is just like I didn't spend that half an hour.
- Then I just took away the hydraulic brake pads completely with their mount, to root these out as cause, and indeed, the noise just stayed.
- Today my bicycle had a small but heavy load and I was able to walk while holding the bike and hear the noise so that I could look. The noise occurred at a certain wheel position that I now marked on the tire and rim. A close inspection (of tire, rim and spokes) around the ground contact at that position reveiled nothing. I checked all spokes but none broken and no noticable (feel) tension differences.
- I then decided to lower the tire pressure, but again no influence on noise.
So despite all the effort I'm still standing where I was.
Since there is just nothing close enough to the tire to contact it, even under load, it's like the scraping noise comes from the wheel not its tire. One idea is that a couple crossing and eachother touching spokes, move relative to eachother under the stress of load.
I just don't know, I'm guessing all the way.
The setup is a 62 mm tire (Schwalbe "super moto x" on a 22 mm rim.
Since it happens alot that I carry substantial weight, and I'm not a small person too, I have to put quite some high pressure, for this size, in the tire (I typically pump till 3.2 bar).
The surface of the outer tires (front and back) shows quite some sideways movement. Hard to get rid of it, possibly due to the fairly narrow rim for the tire. But that's since I acquired the bike 2 years ago, and the noise wasn't present then.
So I'm now hunting reasons I didn't think of.
It comes by itself, lasts weeks then it goes by itself. And some time later, it's suddenly back. Last occasion it ceased a couple months ago. Since yesterday it's back.
Before yesterday there wasn't an apparent reason for its start.
Yesterday after I came home without experiencing anything along the road also not when arriving back. Some half hour later when I unloaded the bicycle it almost felt over, I wondered but I didn't check at the time. But hours later, when deciding to put the bike inside, I noticed the rear tire was entirely flat. Punctured 1 cm out of the center by a 2 cm long flathead nail, that looked like new (no rust, not bent, alike a nailgun just shot a new one in).
After removal and check I replaced the inner tire.
First ride after, that hated noise was back.
In the past I stopped dozens times along the road to try to locate the cause, for no result.
- When putting the bike upside down, and spinning the wheel, nothing is heard so the contact that produces the noise must be caused under the weight of bicycle and rider.
- There is plenty clearance in all directions around the outer tire - nothing comes close enough.
- I've learnt how to tru the wheel sideways (I put folded paper between a brake pad and the rim) and perpendicular (if that's the right word) with as reference an english key held close against it and stabilized along the luggage frame. In the past and today I succeeded truing it like that, but despite spending half an hour today along the road to tru subsequently finer, when I jump on the bike and ride away the noise is just like I didn't spend that half an hour.
- Then I just took away the hydraulic brake pads completely with their mount, to root these out as cause, and indeed, the noise just stayed.
- Today my bicycle had a small but heavy load and I was able to walk while holding the bike and hear the noise so that I could look. The noise occurred at a certain wheel position that I now marked on the tire and rim. A close inspection (of tire, rim and spokes) around the ground contact at that position reveiled nothing. I checked all spokes but none broken and no noticable (feel) tension differences.
- I then decided to lower the tire pressure, but again no influence on noise.
So despite all the effort I'm still standing where I was.
Since there is just nothing close enough to the tire to contact it, even under load, it's like the scraping noise comes from the wheel not its tire. One idea is that a couple crossing and eachother touching spokes, move relative to eachother under the stress of load.
I just don't know, I'm guessing all the way.
The setup is a 62 mm tire (Schwalbe "super moto x" on a 22 mm rim.
Since it happens alot that I carry substantial weight, and I'm not a small person too, I have to put quite some high pressure, for this size, in the tire (I typically pump till 3.2 bar).
The surface of the outer tires (front and back) shows quite some sideways movement. Hard to get rid of it, possibly due to the fairly narrow rim for the tire. But that's since I acquired the bike 2 years ago, and the noise wasn't present then.
So I'm now hunting reasons I didn't think of.
