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Old 09-09-17, 01:27 PM   #1
kego
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Brompton M3R - crackles at the hub

Hello,

A new B owner with 3-speed... This is my first hub gear bike. When I ride on 2nd and 3rd gears, the ride is seamless, but when I change to lowest 1st gear, especially before a slope, there's a crackle and clatter sound/feeling from the hub. Like when you pedal, there's short "krak!" and then goes ok. Sometimes a short sort of quiet fricton noise accompanies. Hope I was able to define the noise...

Any similar experience like that? Bike is 2017 model (old classic shifter) S-A standart 3-gear hub with 44T.
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Old 09-09-17, 01:56 PM   #2
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Old classic standard AW3 trigger shifter is steel . youngster

you know how to dial in the via indicator chain to get it, the hub in adjustment? [internet has that]

Are you letting the hub change gears by stopping pedaling for a moment?





....
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Old 09-09-17, 02:43 PM   #3
kego
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Originally Posted by fietsbob View Post
Old classic standard AW3 trigger shifter is steel . youngster

you know how to dial in the via indicator chain to get it, the hub in adjustment? [internet has that]

Are you letting the hub change gears by stopping pedaling for a moment?





....
Thank you @fietsbob for reply.

Yes, I learned it at the first place to stop pedal while gearing and I apply that. But, rest I am totally a newbie to Brompton and its systems...
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Old 09-09-17, 02:54 PM   #4
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the epicyclic (Planetary) geared 3 speed is over a century old https://en.wikipedia.org/wiki/Epicyclic_gearing
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Old 09-09-17, 03:09 PM   #5
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Quote:
Originally Posted by kego View Post
Hello,

A new B owner with 3-speed... This is my first hub gear bike. When I ride on 2nd and 3rd gears, the ride is seamless, but when I change to lowest 1st gear, especially before a slope, there's a crackle and clatter sound/feeling from the hub. Like when you pedal, there's short "krak!" and then goes ok. Sometimes a short sort of quiet fricton noise accompanies. Hope I was able to define the noise...

Any similar experience like that? Bike is 2017 model (old classic shifter) S-A standart 3-gear hub with 44T.
I'm not good at explaining how this stuff works, but one gear in an IGH always has a different feel/sound to it. You might want to have a shop check it, but it's probably normal, it's just weird because you're used to derailleur systems. It's definitely a learning curve when you're new to it.
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Old 09-09-17, 03:22 PM   #6
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These hubs can be noisy. When the pawls engage there can be quite a loud metalic klang sound, if they're lacking in lubrication the pawls can tick loudly. If the indicator is badly adjusted or if there's friction in the cable then shifts can be awkward.
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Old 09-10-17, 02:17 AM   #7
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Originally Posted by kego View Post
Hello,

A new B owner with 3-speed... This is my first hub gear bike. When I ride on 2nd and 3rd gears, the ride is seamless, but when I change to lowest 1st gear, especially before a slope, there's a crackle and clatter sound/feeling from the hub. Like when you pedal, there's short "krak!" and then goes ok. Sometimes a short sort of quiet fricton noise accompanies. Hope I was able to define the noise...

Any similar experience like that? Bike is 2017 model (old classic shifter) S-A standart 3-gear hub with 44T.
This does not sound right to me, especially the "...there's short "krak!" and then goes ok..."

Take a look at the videos here: https://www.youtube.com/results?sear...on+3+speed+hub

to learn more about the hub.

my guess is that this is a new bike and the cable has stretched so the hub is out of adjustment a tiny bit. If you bought the bike from a shop you should take it back to the shop and ask them to take the bike for a ride and listen to it and then adjust the hub..

If you are far from a shop that can help you look at the youtube videos, read about the hub https://no.search.yahoo.com/search?f...on+3+speed+hub

Keep us updated.
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Old 09-10-17, 01:32 PM   #8
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I have a couple of SA 3 speed hubs and I find that removing the adjustment shaft and putting in a couple of ccs of 5-20 synthetic motor oil makes them run much much quieter. When they get noisy another drop or two of oil is added. I do this with the bike lying on its left side. A little oil seeps out over time but not enough to make a mess on the floor. Of course, you need to turn the shaft all the way in and then back out half a turn or so, and the cable tension needs to be such that when you shift from high to the medium gear the unthreaded part of the shaft just barely shows.
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Old 09-11-17, 02:00 PM   #9
kego
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So far that noise is only when I pedal at the lowest gear, if there's load - like I pedal with force (beginning of a ramp etc)

Let me do some km's and monitor... Within 1 month I have first month service check but the problem is since Brompton is new in TR, the mechanics are not so experienced and have only generic info.

Thank you all, will keep you updated.
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Old 09-12-17, 01:33 AM   #10
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If the hub is out of adjustment i would not ride it like that for a month...

The Brompton may be new to them but a SA three speed hub they should know. They have been around since Noahs Ark.
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