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Old 02-10-12, 11:46 AM   #1
tcs
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Sturmey-Archer R-SRF3

Just in case anybody's not up to speed on this. It became available in 2011.

The std Sturmey pull chain arrangement has been replaced in this model by a rotary cam (Sturmey patent, 1970!), with the shift actuation inside the dropouts. The shift cable is simple to attach/remove with no unthreading/readjusting of anything and no loose parts when disconnected. The R-SRF3 has a solid axle not weakened by any internal passageways or cut outs, and the axle nut threads are 3/8" like Shimano rather than 13/32" like other S.A. hubs. Otherwise, it continues with Sturmey goodness: the beautiful polished hub shell, NIG, comes in the box with all the nuts, washers, cable, shifter, cog, etc you need to put it in service, &etc. The cable pull requirements to shift the R-SRF3 are greater than the classic AW family of hubs, and it uses a different (factory) shifter. Mine came with a dual paddle 'push-push' (RapidFire style) straight bar shifter. 130mm OLD to make room for the rotary gear select.

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Old 02-10-12, 12:07 PM   #2
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Cool!
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Old 02-10-12, 12:14 PM   #3
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Quote:
Originally Posted by tcs View Post
Just in case anybody's not up to speed on this. It became available in 2011.

The std Sturmey pull chain arrangement has been replaced in this model by a rotary cam (Sturmey patent, 1970!), with the shift actuation inside the dropouts. The shift cable is simple to attach/remove with no unthreading/readjusting of anything and no loose parts when disconnected. The R-SRF3 has a solid axle not weakened by any internal passageways or cut outs, and the axle nut threads are 3/8" like Shimano rather than 13/32" like other S.A. hubs. Otherwise, it continues with Sturmey goodness: the beautiful polished hub shell, NIG, comes in the box with all the nuts, washers, cable, shifter, cog, etc you need to put it in service, &etc. The cable pull requirements to shift the R-SRF3 are greater than the classic AW family of hubs, and it uses a different (factory) shifter. Mine came with a dual paddle 'push-push' (RapidFire style) straight bar shifter. 130mm OLD to make room for the rotary gear select.

I've got one of those here, but I don't have any build plans for it yet. One thing I will note is that one of the usual advantages of gearhubs is lost with this hub. The drive side flange is inset a great deal more than the non drive side, to the extent that the wheel would have nearly as much dish as a cassette type. There is quite a lot of axle protrusion, so I'm thinking when I do build it up, I'll put a 5mm nut on the non drive side to make it a 135 OLD just to alleviate the dish a bit.
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Old 02-10-12, 04:36 PM   #4
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As much as I love the classic AW and its modern derivatives, this is probably better. As long as they keep making the classic stuff for people like me with narrow rear ends on our frames, I'll be happy.
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Old 02-10-12, 04:38 PM   #5
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Oh, yeah, the AW/SRF3/etc chain pull hubs are all still in production. This hub is just something in addition.

Quote:
Originally Posted by Dan Burkhart View Post
There is quite a lot of axle protrusion, so I'm thinking when I do build it up, I'll put a 5mm nut on the non drive side to make it a 135 OLD just to alleviate the dish a bit.
Good idea!
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Old 02-11-12, 01:18 PM   #6
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Quote:
Originally Posted by tcs View Post
Just in case anybody's not up to speed on this. It became available in 2011.

The std Sturmey pull chain arrangement has been replaced in this model by a rotary cam (Sturmey patent, 1970!), with the shift actuation inside the dropouts. The shift cable is simple to attach/remove with no unthreading/readjusting of anything and no loose parts when disconnected. The R-SRF3 has a solid axle not weakened by any internal passageways or cut outs, and the axle nut threads are 3/8" like Shimano rather than 13/32" like other S.A. hubs. Otherwise, it continues with Sturmey goodness: the beautiful polished hub shell, NIG, comes in the box with all the nuts, washers, cable, shifter, cog, etc you need to put it in service, &etc. The cable pull requirements to shift the R-SRF3 are greater than the classic AW family of hubs, and it uses a different (factory) shifter. Mine came with a dual paddle 'push-push' (RapidFire style) straight bar shifter. 130mm OLD to make room for the rotary gear select.

Did your hub come with the auxiliary tool as shown in point # 3 on this document?
http://www.sturmey-archer.com/userfi...2005-04-27.pdf
It was not included with my hub, but I found it wasn't that hard to align the rotary mechanism without it.
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Old 02-11-12, 02:14 PM   #7
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Symmetrical and Asymmetrical dish, I can live with...

What I have noticed as the biggest improvement with IGH hubs - especially the last few I've worked on:

Flange Thickness

Which makes for a much "snugger" fit between the flange and the elbow of current spokes.

=8-)
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4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
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Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
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Old 02-11-12, 07:30 PM   #8
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Quote:
Originally Posted by Dan Burkhart View Post
Did your hub come with the auxiliary tool as shown in point # 3 on this document?
Nope, but like you, I found it wasn't any big deal to align the fulcrum lever set without the auxiliary tool.
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