Scraping noise
10-18-18 | 11:46 AM
#1
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Joined: May 2006
Posts: 355
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From: Cleethorpes..the last resort..UK
Bikes: Brompton S6L ,Bike Friday NWT, Phillips 8 speed folder, Trek 930, Thorn XTC
Scraping noise
Scraping noise on my Bromptonj 6 speed..any ideas..I have a scraping noise coming from my back wheel or hub..Checked all the obvious things,mudguard,brakes,side to side play in the rear wheel,,chain tensioner,etc..All the hub gears work fine and change ok between the 2 sprockets..The scraping noise is heard at a slow speed when just coasting along or pedalling slowly..The bike is 6 years old and perhaps done 3000 miles or so..Checked the main rear pivot bearing and there is no play in that..If the bike is lifted up at the rear and the cranks turned the wheel turns really well for ages ..Everything has been lubricated well..
Is it time for more grease to be put in the hub..or perhaps some engine oil put in through the right side gear changer?
Is it time for more grease to be put in the hub..or perhaps some engine oil put in through the right side gear changer?
10-18-18 | 02:47 PM
#2
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Joined: Oct 2012
Posts: 473
Likes: 16
From: casper wy usa
Bikes: brompton sl, surly steamroller, fuji track, gary fisher bmx minivelo etc
I have had odd noises over the years which wound up being:
Dry polymer suspension. Take it apart and grease the bolt. Mine squeaks more with pedal stroke than bumpy road.
Seat post isn't quite tight enough. This may involve replacing the sleeve and I wound up paying an LBS to do this. As I had overtightened the QR before, I had ovalized the post and had to replace that too.
The SA 3 speed made odd noises, especially in high gear. I resolved that by putting synthetic 5-20 motor oil in the hub through the shifter opening in the axle. When it gets a little noisy I put in another cc or two. The downside to this is the hub slowly leaks out the oil, so I switch to a 1 speed wheel if I take it in the car to another city. The upside is when adjusted properly it shifts easily and runs much more quietly.
I have replaced the ISO bottom bracket with a JIS Shimano and there have been no bottom bracket noises after that. BTW no issues noticed with an ISO crank and a JIS bottom bracket.
Dry polymer suspension. Take it apart and grease the bolt. Mine squeaks more with pedal stroke than bumpy road.
Seat post isn't quite tight enough. This may involve replacing the sleeve and I wound up paying an LBS to do this. As I had overtightened the QR before, I had ovalized the post and had to replace that too.
The SA 3 speed made odd noises, especially in high gear. I resolved that by putting synthetic 5-20 motor oil in the hub through the shifter opening in the axle. When it gets a little noisy I put in another cc or two. The downside to this is the hub slowly leaks out the oil, so I switch to a 1 speed wheel if I take it in the car to another city. The upside is when adjusted properly it shifts easily and runs much more quietly.
I have replaced the ISO bottom bracket with a JIS Shimano and there have been no bottom bracket noises after that. BTW no issues noticed with an ISO crank and a JIS bottom bracket.
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