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Reportedly, SunRace/Sturmey-Archer is considering doing a new production run of the ASC 3-speed fixed-gear hub, or an updated version of it. Given SunRace's track record with Sturmey-Archer, I would expect a new version to be more reliable than the original.
They're not certain about how much demand there might be for it though. If this is something that would be of possible interest to you, let them know by sending an email to them using the link below:
|K831|| Axle, 5 1/2" long|
|K805A|| Low Gear Dog|
|K402||Low Gear Key|
|K809A||Secondary Sun Pinion|
|K 412||Locking Washer|
|K8l5A||Secondary Planet Cage|
|K816A||Secondary Planet Pinion|
|K8lOB||Low Gear Spring|
|K808||Primary Sun Pinion|
|X8||Collar for Compensator Spring|
|K807Z||Coupling complete, quick-release type. Not illustrated|
|K74OAZ||Quick Release Connection. Not illustrated|
|K529|| Spring Cap|
|K228||R H. Ball Ring|
|K23OZ||Ball Cage with 3/16" ball-hearings|
|K67Z||Ball Cage with S I" halls|
|LB405||Outer Dust Cap|
|K506Z||Axle Cone with Dust Cap|
|K516||R.H. Cone Locksng Washer|
|K718Z||Shall, 40 holes, with Ball Cup|
|K7l8AZ||Shell, 36 holes, with Ball Cup|
|X42A||Axle Spacing Washer|
|K521||Axle Locking Washer|
|N190||L.H. Axle Nut|
|N200||R.H. Axle Nut|
|K229||Sprocket, Dust Cap|
|K464||Sprocket, 14 reeth|
|K465||Sprocket, 15 teeth|
|K466||Sprocket, 16 teeth|
|K467||Sprocket, 17 teeth|
|K468||Sprocket, IS teeth|
|K469||Sprocket, 19 teeth|
|K470||Sprocket, 20 teeth|
|X49||Sprocket Spacing Washer|
TO RE-ASSEMBLE THE ASC HUB
Proceed as follows:
Prepare the following preliminary sub-assemblies:
- Fit the ball cage into the left-hand ball cup, with the ring of
the ball-retainer facing outwards and the recess in the dust cap
also facing outwards. If a new ball-retainer is being fitted, the
dust cap also should be new.
- Fit the ball cage into the driver, with the ring of the ball-
retainer facing outwards and the recess in the dust cap also
facing outwards. If a new ball-retainer is being fitted the dust
cap also should be new. If the sprocket has been removed see
No. 27 below.
- Smear grease in the channels of the dust cap of the left-hand
ball cup and the driver and in The recess of the right-hand ball ring. Do not use grease anywhere else.
- Hold the axle in a vice, with the smaller slot uppermost, and fit the
low-gear clutch sleeve with its flange on top.
- Slip the small low-gear key through the holes of the low-gear clutch
sleeve, making sure that the hole through the key is in line with The
bore of The axle. Hold The key temporarily in position by dropping
the indicator rod down the axle through the key.
- Holding the indicator rod in position with one finger, remove the
axle from the vice and hold it the other way up. Fit the low-gear
clutch on to the axle, with the four dogs pointing downwards.
- Fit the large low-gear spring and the primary sun pinion, with its
four large legs pointing downwards and so engaging the low-gear
clutch. (The low-gear spring, The compensating spring, and the
clutch spring must be of the same series. If one has to be replaced
The other two must be.)
- Slip the indicator rod out of the axle (the low-gear clutch key will
now stay in position) and put the axle back in the vice.
- Fit the primary planet cage complete.
- Drop The compensating spring down the axle, collar first.
- Fit the clutch sleeve (flange first) and the sliding clutch with the
recess over The flange of The sleeve.
- Lift the clutch sleeve and the clutch up to the top of the long axle
slot and insert axle key Through The clutch sleeve, making sure That
the two flats on The key are facing upwards.
- Fit The indicator coupling by passing the rod, down the axle through
the axle key and onto the compensator spring. Note that the
indicator coupling must always be fitted before the indicator rod.
- Remove the axle from the vice and push the indicator rod into the
left-hand end of the axle. Press the assembled mechanism down on
a flat surface to force the indicator rod into the axle, at the same
time pressing down on the sliding clutch. Then rotate the indicator
chain to screw it to the indicator rod. When the chain is felt to be
fully screwed home insert a small screwdriver into the slot of the
indicator rod and exert a slight extra pressure on the chain, to make
sure that the indicator and the rod are both fully screwed together,
taking care not to twist off the small threaded end.
- Fix the axle in thc vice again and make sure that the clutch slides
quite freely on the axle when the indicator chain is moved up and
- Fit the thrust collar, making sure that both slots fit over the flats
of the axle key. Add the thrust washer.
- Fit the gear ring, the ball ring (with ball cage), the driver, the axle
spring and the clutch spring cap in that order.
- Fit the right-hand cone and screw it up finger tight. Then slacken
it back half a turn and lock it in that position with the special washer
and locknut. On no account must the cone be unscrewed more than
half a turn, as that would throw the gear mechanism out of adjustment.
- Remove the assembled mechanism from the vice and replace it the
other way up.
- Fit the secondary planet cage, with the pins upwards and the slots
engaging the limbs of the low-gear dog.
- Fit the secondary planet pinion.
- Fit the secondary sun pinion, with the recess downwards, so that
the sun pinion engages with the square flats on the axle.
- Fit the locating plate and tab washer and tighten the locknut.
Turn over the edge of the washer on two opposite sides of the
- Remove the assembled mechanism from the vice, hold it vertically
with the planet cage uppermost and pour about two teaspoonfuls
of a good quality thin oil into the cage.
- Insert the assembled mechanism into the hub shell and screw up
the right-hand ball ring finger-tight only.
- Make sure that the marks put on the ball ring and the hub flange
before dismantling will register properly, and then screw up tightly.
- Fit the left-hand cone, washer and locknut in the arrangement
noted when dismantling, and adjust the hub as described in The
Fitting and Adjustment of Sturmey-Archer Hubs.
- Fit any special washers noted when dismantling the hub.
- If the sprocket has been removed from the driver, fit the outer
dust cap over the driver before replacing the sprocket, and see that
the dust cap is properly centered on the flange of the driver. Replace
the sprocket and the spacing washers in the arrangement noted
when dismantling, and add the circlip.
- Replace the wheel in the cycle frame and adjust the gear as described in `The Fitting and Adjustment of Sturmey-Archer Hubs.'
Thanks to Harvey Sachs for sending me this information.
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Last Updated: by Harriet Fell