SRAM A2 Automatix; introduction to the internals

For discussions about bikes and equipment.
Col18
Posts: 21
Joined: 13 Jun 2018, 3:23pm

Re: SRAM A2 Automatix; introduction to the internals

Postby Col18 » 17 Jun 2018, 10:27am

More photos

Thank you for your help again. :D
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Col18
Posts: 21
Joined: 13 Jun 2018, 3:23pm

Re: SRAM A2 Automatix; introduction to the internals

Postby Col18 » 20 Jun 2018, 1:51pm

Hi
Another update....
Today this piece has come loose on my cycle to work.
I've knocked it back in. Seems fine.
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Brucey
Posts: 35161
Joined: 4 Jan 2012, 6:25pm

Re: SRAM A2 Automatix; introduction to the internals

Postby Brucey » 20 Jun 2018, 2:01pm

not to worry you but this may just be because the dustcap is/was a slightly loose fit (did you remove it before?) but it may also signify that the clipped balls are starting to misbehave in that bearing.

In the latter case if the clip starts to break up it can seriously damage or even wreck the hub. Once a bearing has become slightly corroded breakage of the clip is more likely.

It is better to use loose balls in a bearing of this sort (rather than a clip) but in many cases there is enough room for the balls to escape (into the internal mechanism of the hub which will definitely break it) which makes reassembly much more tricky. I don't recall if there is this kind of problem with this hub or not tbh.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

Col18
Posts: 21
Joined: 13 Jun 2018, 3:23pm

Re: SRAM A2 Automatix; introduction to the internals

Postby Col18 » 20 Jun 2018, 2:18pm

Thanks for the reply.
I didn't take this off when I did the adjustment.
I don't remember this getting loose, always stuck there, when the shoulder was off.
Will keep me eye on this.
I'll have to be careful when washing the bike now as water could easily get into the hub.

mig
Posts: 2030
Joined: 19 Oct 2011, 9:39pm

Re: SRAM A2 Automatix; introduction to the internals

Postby mig » 20 Jun 2018, 4:08pm

i was going to have a lash at commuting with one of these hubs some time ago. i'm mostly glad that i stuck with an old fixed hub as these look a little weak in the execution.

where do you ride? somewhere really chalky?

Col18
Posts: 21
Joined: 13 Jun 2018, 3:23pm

Re: SRAM A2 Automatix; introduction to the internals

Postby Col18 » 20 Jun 2018, 5:00pm

The hub is on an ebike with pedal assist only. Commuting 2-3 times a week, through winter and through rain sometimes.

Before the spring adjustment, carried out 2 weeks ago; the hub has been fine.
But as mentioned the gear change setting is low, so even on a 4% slope/hill, it will still be in the higher gear; can and can be a slight strain on the legs.

My commute is mainly flat with 4 short 4-7% slopes. Ride half road and half canal tow paths over 11 miles.
Bought the bike due to price and simplicity; and to ride without getting to sweaty.

It's only since carrying out the spring adjustment that these issues have occurred. But with the adjustment, on the few slopes it is easier on the legs.
The motor pushes me with me pedaling at 12-13mph on the hill, the the springs adjustment make the gear change at 13/14mph, so this is now ideal.