Accessories Bicycles Parts Specials Tools

Search sheldonbrown.com and sheldonbrown.org

Sturmey-Archer Internal-Gear Hubs, Tech Tips

find us on FB

Sheldon Brown photo
by Sheldon "Indicator" Brown
and John "Explicator" Allen
Spoke Divider

On-line Gear Calculator for Internally-Geared Hubs

Hubs covered

Old English T his article gathers information common to many models of Sturmey-Archer internal-gear hubs. Information about specific models is in the articles about

There are also articles on this site more generally about

Most Sturmey Archer hubs with more than three speeds use compound (stepped) planet gears with two or more sets of teeth --each set has a different number of teeth. One set engages the gear ring; each set engages a different sun gear. These hubs all have odd numbers of speeds: the unity ratio, and pairs of higher and lower speeds achieved by locking each of the different sun gears to the axle.

The 8-speed hubs are constructed differently, with three planetary stages one after the other.

Spoke Divider

Spoke Divider

Fear not!

Old English M any mechanics are scared of internal-gear hubs, and think of them as being impossibly complicated. Even if you are too chicken to try taking an internal-gear hub apart, that shouldn't stop you from working on bikes that use them. The classic Sturmey-Archer AW hub is the most reliable gear-shifting mechanism ever made, and rarely needs anything more than a bit of medium-weight oil every so often. 95 percent of shifting problems on 3-speeds are related to the control cable or the shifter.

Cable replacement

Old English A ttachment of the cable to the classic three-speed trigger control is covered in a file of its own. Most Sturmey-Archer three-speeds can use the trigger control, though another shifter may be supplied with the hub. it is hard to beat the trigger control for durability and secure engagement. The trigger not only indexes, it latches.

Cable adjustments

indicator spindle Old English M ost Sturmey-Archer hubs have a little chain coming out of the right end of the rear axle, to which the end of the control cable attaches. This chain (called an "indicator spindle" by cognoscenti) screws into an internal part of the hub by rather delicate threads.

Variations:

These variations are covered in the instructions for specific hubs.

When you install an indicator spindle, screw it in finger-tight, then back it off 1/2 turn. It should not be bottomed out on its internal threads, so that it can swing freely to face the cable. This adjustment must be checked every time the cable is re-attached.

The fine adjustment of the cable tension is accomplished by how far the sleeve at the end of the cable screws onto the threaded stud at the end of the indicator spindle's chain. The official manuals tell you to adjust it by visual examination of the end of the indicator spindle shaft, but this doesn't always work, especially if the indicator spindle is not original equipment. For best results, adjust the cable by tension. When the trigger is in high-gear position, the cable should be totally slack. Shift down to middle gear, while watching the indicator chain-it should clearly move as you make the shift. Then shift to low gear; again, you should see more chain coming out of the axle nut. Sometimes the internal parts line up in such a way as to prevent downshifting. If you have trouble getting the hub to downshift, turn the pedals slightly forwards. Once you are sure that the hub is in low gear, take hold of the indicator-spindle chain and try to pull more of it out of the axle. If the adjustment is correct, you should be able to get just a tiny bit more movement from the chain. If it is completely taut, the cable is too tight. Make sure to tighten the knurled locknut on the indicator spindle so that the adjustment will stay as you have set it.

The table below lists the various indicator spindles and the hubs for which they are intended. Generally, spindles with numerical markings are for older hubs, while those with color markings are intended for newer hubs. It is OK to use a shorter spindle if the chain does not sink all the way into the flared axle nut in high gear -- though installation may be more difficult. A longer spindle may prevent low gear from engaging properly, if the spindle protrudes so far past the end of the axle that the indicator chain pulls it at an angle.

Measurement of spindle length is from the base of the spindle threads to the shoulder just before the first link of chain, as shown in the illustration. Spindle lengths marked * in the table have been confirmed by direct measurement. A spindle may look like the one shown in the illustration, or be thinner. That is of no importance.

Indicator spindle measurement

Note Intended for hub - R: right; L left: Axle length Spindle length, mm Part number Mark
  AW
AG, AB
TCW
S5
S5.1 R
S5/2 R
5¾"

146mm
5¾ "
5 13/16"
5 7/8"
49 mm* HSA125 I
  AW old
AWC
S3C
TCW
S5
S5.1 R
S5.1 L.
S5/2 R
S5/2 L early
6¼"
152mm
152mm
159mm
6", 6¼"
1, 5/16"
5 13/16", 6 1/16"
6 1/8", 6 3/8"
5 7/8", 6 1/8"
56mm: some have shoulder at 49mm* HSA126 II
  AW new
AWC
S3C
X-RD3
SX-RK3
SX-RB3
TS-RF3
6¼"
159mm
159mm
163mm
215mm
215mm
163mm
59mm* HSA315 III
  AWC
AWC(II)
S-RC3(II)
XL-RD3
TS-RC3
S5.1 L
S5/2 L early
5-Star
5-Star Elite
163mm , 6.4"
163mm
163mm
177mm
163mm
6 5/16"
6 3/8"


62mm* HSA316 IIII, IV
  S5/2 L late
AWC
AWC(II),
S-RC3(II)
QS-RC3
6 1/8"
175mm, 7"
175mm
175mm
175mm
66mm HSA420 V
  Mystery spindle!     HSA615 VI
  S5/2 late 6 3/8"   HSA 421 VII
F30 series, hybrid gearing CS-RF3
CS-RK3
179mm
179mm
  HSA716 VIII
Disk brake
3-speeds
S-RK3
S-RK3(N)
185mm   HSA715 IX
Newer 5-speeds X-RD5   62mm HSA317 Light Blue
Newer 5-speeds Sprinter
Sprinter Elite
Sprinter C.
SAB-5
AB-5
  67.5mm* HSA490 Red
Newer 5-speeds X-RC5(W)
S-RC5(W)
SRC5(N)
XL-RD5(W)
X-RD5(W)
X-RF5(W)
S-RF5(W)
175mm

70mm* HSA585 Yellow
Newer 5-speeds S-RF5(W)
S-RF5(N)
148mm 57mm HSA651 Green
Fixed gear S3X with short guide nut 165mm   HSA652 Orange after 1/2 link
Fixed gear S3X with short guide nut 174mm   HSA653 White after 1/2 link
  AB (new) 7" 62mm* HSA712 Navy Blue
Fixed gear S3X - must use long guide nut 165mm   HSA713 Orange after full link
Fixed gear S3X - must use long guide nut 174mm   HSA714 White after full link
Newer 5-speeds X-RF5(W)
S-RF5(W) w/HMN420 short guide nut;
X-RK5(W),
X-RK5(N)
S-RK5(N)
S-RK5(N)
185mm 70.5mm HSA717 Purple

Double-check the adjustment in all gears. In low gear, you should be able to see that the sprocket moves faster than the wheel, and the hub should not make a ticking sound while being pedaled forward. In middle gear, the sprocket should move at the same speed as the wheel, and you may hear a slow ticking as you pedal. In high gear, the wheel should turn faster than the sprocket. The same slow ticking may be audible in high gear.

If you hold the trigger halfway between middle and high gear with an older hub, it will disengage so that you can spin the pedals forward without going anywhere. If it freewheels forward in high gear, the cable is to tight or has too much friction to release properly. If it freewheels forward in middle gear, the cable is too loose. Be sure you keep the cable correctly adjusted. If the hub pops out of gear, especially when you are standing to pedal, you could crash, or bang a knee on the handlebar.

Spoke Divider

Spoke Divider

Cone adjustment

Old English C one adjustments must only be made on the left side of the hub -- but first make sure the right cone is properly in place. On most hubs, before installing the left cone, or with it loose, screw down the right cone until the internal mechanism begins to bind. Then back the right cone off between 1/8 and 5/8 turn, so the mechanism turns freely, and secure the cone with its locknut. This procedure positions the mechanism inside the hub shell. Older hubs use a special tabbed washer between the cone and locknut. Newer hubs with rotary shifting have a more complicated right-side assembly -- follow the instructions specific to each hub.

Cones (for many
S-A hubs)
Tab washer
for right cone
cones tab washer

Once you have finished with the right cone, you are ready to adjust the left cone.

A properly-adjusted wheel will have very slight play at the rim. If the left cone adjustment is too tight, the pedals will tend to turn forward as the wheel turns. (This same symptom may result if the chain is too tight, or if the right cone has pulled the internal mechanism to the right so it is binding.) A very sensitive test of bearing adjustment with many Sturmey-Archer hubs is to try to tilt the sprocket, rocking it relative to the hub shell. When there is very slight play at the sprocket, there will be no discernible play at the rim, yet the wheel will still turn freely. Precise cone adjustment is especially important for clean shifting when using hybrid gearing.

Anti-rotation washers

Old English W hen you remove and re-install a rear wheel with an internal-gear hub, pay particular attention to the axle washers. The axles are flatted, and there are special anti-rotation washers keyed to the flats on the axles. These washers have tabs that must face into the dropouts to help keep the axle from twisting under load. The tendency of the axle to twist is greater the farther the gear ratio is from direct drive, the larger the rear wheel, and the harder the cyclist is pedaling.

There are at least eight different kinds of Sturmey-Archer anti-rotation washers. Axles of all Sturmey-Archer internal-gear hubs except those with rotary shifting have the 13/32" (10.3mm) outside diameter, and so the same washers will fit any of these hubs-- but different installations require different washers. The RS-RF3 and RX-RD3 three-speed hubs with rotary shifting have a 3/8" (9.5mm) axle diameter and use different washers.

Where part numbers for two washers are given, they are interchangeable. but the second has a Xylan (painted, anticorrosion) finish.

Description Part number Appearance
Thin, stamped steel washer with tabs either side of the axle hole only as wide as the flats on the axle. Designed to fit the narrow dropout slots of traditional English three-speed bicycles. K521,
HMW145
Sturmey-Archer HMW145 antirotation washer
Sintered. Introduced approximately 1975. Replaces the HMW 145 and provides more resistance to rotation and chain pull. HMW155 anti rotation washers
Like the HMW155, only with 9.5 mm (wider) tabs to fit wider dropout slots. The axle is held by the washer so its flats do not touch the sides of the dropout slot. HMW494 anti rotation washer
1.8 mm thick stamped steel, single 9.5 mm wide tab. Because there is no opposite tab, the axle tends to slip from side to side in the dropout slot. See additional comments below. HMW515 anti rotation washer
4.0 mm thick stamped steel, single 9.5 mm wide tab. Because there is no opposite tab, the axle tends to slip from side to side in the dropout slot, except with the 8-speed hub. See additional comments below. HMW518
HMW529
anti rotation washer
Thin washers used on Brompton bicycles, with two tabs at the outside. These washers reduce clearance issues, and are strong enough with the small-wheel Brompton bicycles. HMW526; in Brompton QRW3NB-SA set anti rotation washer
For 3/8" (9.5 mm) diameter axle of RS-RF3 and RX-RD3 rotary-shifting 3-speeds. 4.0 mm thick stamped steel, single 9.5 mm wide tab. Because there is no opposite tab, the axle tends to slip from side to side in the dropout slot. HMW521
HMW530
anti rotation washer
Sintered, with a single 9.5 mm wide tab. Same slippage issue as with the HMW518. Recommended by Sturmey-Archer for vertical dropouts. HMW534 anti rotation washer

When installed with its back facing a smaller part, an anti-rotation washer will be stressed, and a thin one may bend. It is a good idea to install a thick washer of equal or larger outside diameter behind the anti-rotation washer.

Any Sturmey-Archer internal-gear hub with pull-chain shifting can be installed in vertical dropouts if an eccentric bottom bracket is used. The newest (wide-range) 8-speed hub may also be used with vertical dropouts, as the shifter pulley inside the right-hand dropout can be reoriented before installing the hub. A chain tensioner or rear derailer also may be used for chain adjustment, except with coaster-brake and fixed-gear hubs.

Sturmey-Archer recommends the HMW515, HMW518 or HMW534 washer for use with short, vertical dropouts, but then the assembly rests only on the washer's tab at one end, and the edge of the axle flat at the other. With most hubs, the assembly will tend to twist backward in the dropout slot in the lower gears, and forward the higher gears.

The 8-speed hub has only direct drive and higher gears, and tends to twist the axle only forward, making for a more stable installation. Sturmey-Archer recommends only the thicker washers for use with this hub. However, there has been a report of anti-rotation washer breakage with the 8-speed hub and a heavy cyclist sprinting in a high gear. If a dropout is thick enough, or by facing tabs of single-ended washers toward opposite ends of the dropout slot, two washers may be used at each end of the axle for extra strength-- one inside and one outside the dropout. This trick can be useful with other hubs besides the 8-speed as well.

broken anti-rotation washer

Shimano and SRAM anti-rotation washers do not fit a Sturmey-Archer axle.

The axle nuts of internal-gear hubs are easy to strip because of the interrupted threads on the flatted axle, so you should lubricate them with medium-to heavy oil or grease. They do have to be tightened quite securely.

A hub with a coaster brake or drum brake also has a reaction arm. This must be clamped to the bicycle's chainstay. It secures only the brake mechanism and does not substitute for the anti-rotation washers.

Axle length

Old English M ost Sturmey-Archer hubs are available with different lengths of axles. They are listed in the spec sheets for the various hubs. An axle generally needs to be 1 1/4 inches (31 mm) longer than the bicycle's overlocknut spacing, for full thread engagement with the axle nuts. Another 6 to 10 mm is OK, and may be needed if the bicycle has thick dropouts. Too much axle length on the right side may prevent a flared right-side axle nut from being tightened down all the way, and may interfere with operation of the pullchain. When in doubt, test or measure. Adding a washer under the axle nut can free the pullchain.

Different overlocknut distances are accommodated by placing washers between the left bearing cone and locknut, or by locknuts of various thicknesses. It may also be possible to add a washer on the right side. If centering is affected, the wheel may need to be redished.

Older hubs had a rather limited selection of axles, as the standard overlocknut spacing was only 114 mm or 120 mm when these hubs were made. Common axle lengths for the classic AW hub were 5 3/4 inches (146 mm) and 6  1/4 inches (159 mm). A 6 7/16 inch (164 mm) axle suitable for 126 mm dropouts was also made for this hub and its near-relatives. The length difference is at the left end of the axle. The right end is the same for all of these axles. Many current hubs are sold with a choice of two axle lengths.

Lubrication

Old English M odern bikes use grease for lubrication. This is good, because grease lasts a long time, but it is bad because grease can usually only be renewed by disassembling the parts.

Sturmey-Archer discontinued the oil cap on its internal-gear hubs in the mid-1980s, though most newer Sturmey-Archer hubs can be oiled by removing the indicator spindle and squirting oil into the hollow end of the axle. If the axle is hollow all the way through, block the other end so the oil is forced into the mechanism. A Sturmey-Archer oil cap (lubricator) can be installed in most hubs, too. Convert to oil lubrication after a rebuild, as some lubricants are incompatible with each other. Some hubs with a coaster brake or drum brake must be lubricated with grease.

A drop or two of oil on the moving parts of a 3-speed shifter should also be part of regular maintenance.

Please also read the section on lubrication in the main page on internal-gear hubs before rebuilding a hub or converting one from grease to oil.

Spoke Divider

Spoke Divider

Links

Sturmey-Archer logo
Official Site
old Sturmey-Archer logo Heritage site
Three-Speed Parts from Harris Cyclery
English Three Speeds, Care and Feeding
Internal-Gear Hubs
Sturmey-Archer Hubs, General Information
Sturmey-Archer 1902-1952
Sturmey-Archer 1935-38 Catalogues
Evolution of the Raleigh Sports
My old Robin Hood
Sheldon's old Robin Hood
Martin Hanczyc's roadster pages.
Tony Hadland's Sturmey-Archer Pages
including the 1956 master catalogue
Hubstripping web site
Retro Raleighs
SW Hubs by Brian Hayes
Jane Thomas's site with
Sturmey-Archer service manuals.
Menotomy Vintage Bicycles
Chat forum on English bikes.

Spoke Divider

Spoke Divider

Articles by Sheldon Brown and others
Harris
Home
Beginners Brakes Commuting
Lights
Cycle-
Computers
Do-It-
Yourself
Essays
Family
Cycling
Fixed Gear
Singlespeed
Frames Gears &
Drivetrain
Bicycle
Humor
Bicycle
Glossary
Bicycle
Links
Old
Bikes
Repair
Tips
Tandems Touring What's
New
Wheels Sheldon
Brown

Accessories Bicycles Parts Specials Tools

Copyright © 1998, 2008 Sheldon Brown

Harris Cyclery Home Page

If you would like to make a link or bookmark to this page, the URL is:
http://sheldonbrown.com/sturmey-archer_tech.html

Last Updated: by John Allen