Sprockets & Pulleys

 

BAKER offers a wide variety of Pulleys and Sprockets for most of your needs, including offsets for just about every application.

 

If you are looking for information regarding Compensating Sprockets: Click Here.

 

Why Do I Need An Offset Pulley or Sprocket?

 

Refer to the images below for a short course in Pulley and Sprocket Offset Conventions…

32 Tooth, Zero Offset Pulley Section View

32 Tooth, .875 Offset Pulley Section View

24 Tooth, Zero Offset Section View of Sprocket

24 Tooth, .5 Offset Section View of Sprocket

 

Sprockets

By the mid-1980’s, Harley was using the belt drive secondaries in 100% of their Big Twins. The same 1-1/2” wide belt is still used today because it is quiet, clean, and dependable. These belts are the only way to go until you start using an engine that makes serious power. When the engine displacement is above 107ci in a decent state of tune, the life expectancy of the secondary belt is severely degraded. Furthermore, if you are running big meat on the rear you will be hooking up hard, especially in the lower gears; this will destroy your belt. Simply put, the belt drive system is not designed to transmit this amount of torque to the rear wheel and deal with the severe shock loads. In performance applications, the tried and true 530 chain driven secondary drive is the only dependable way to transmit big torque. BAKER Drivetrain offers many 530 chain size transmission drive sprockets for your performance needs for 1985-up Big Twin and 91-up Sportster/Buell. Our sprockets are made in the U.S.A.

 

.200″ Offset Sprocket

 

.200” OFFSET SPROCKET
.200” offset sprockets are modeled after the factory 21 tooth Sportster sprocket, P/N 37709-89, except this series is available with various tooth counts for flexibility in dialing-in your secondary drive ratio.

19 Tooth Sprocket PN 19T02-56
20 Tooth Sprocket PN 20T02-56
21 Tooth Sprocket PN 21T02-56
22 Tooth Sprocket PN 22T02-56
23 Tooth Sprocket PN 23T02-56
24 Tooth Sprocket PN 24T02-56

 

 

 

 

 

 

 

 

.500″ Offset Sprocket

 

.500” OFFSET SPROCKET
The .5” sprocket series permits use of a wider tire than stock and great flexibility in dialing-in your secondary drive ratio.

21 Tooth Sprocket PN 21T05-56
22 Tooth Sprocket PN 22T05-56
23 Tooth Sprocket PN 23T05-56
24 Tooth Sprocket PN 24T05-56

 

 

 

 

 

 

 

 

 

 

.900″ Deep Offset Sprocket

 

.900″ DEEP OFFSET SPROCKET
This sprocket is the maximum offset that can be used without any modification to the stock inner primary. This makes it possible to run a 180 rear tire with no transmission offset or primary drive monkey-business required. Some rear fender modification may be required.
23 Tooth Sprocket PN 23T09-56
24 Tooth Sprocket PN 24T09-56

 

 

 

 

 

 

 

 

 

 

 

Steel Long Life Pulleys

These pulleys are made from a solid chunk of steel and are 23% lighter than the stock cast iron piece. We recommend long life pulleys for performance applications where 100,000 mile+ pulley life is required. Designed for long distance touring applications with mild to moderate engine performance upgrades.

 

All Big Twins with a belt drive from 1985-up have a 32 tooth transmission pulley. Changing to a different pulley with more or less teeth will change two performance attributes of your American machine: rear wheel torque and cruising RPM. Increasing rear wheel torque will increase acceleration. Installing a pulley with more than 32 teeth will decrease your acceleration through the gears and decrease your cruising RPM. Installing a pulley with less than 32 teeth will increase your acceleration through the gears and it will also increase your cruising RPM. This is called engineering compromise; to get one thing, you have to give up another.

 

However, Our BAKER 6-Speed Overdrive allows you to ‘cheat’ engineering compromise. It is common for our customers to install a 30 tooth pulley when they install our 6-Speed Overdrive. This gives them a 7% increase in rear wheel torque and an 8% lower cruising RPM on the highway. It is truly the best of both worlds for your American V-Twin.

 

Pulley Tooth Count  29**  30**  31*  32  33  34**
Wheel Torque Increase  +10%  +7%  +3%  0  -3%  -6%
Cruising RPM in 6th  3017  2916  2822  2734  2648  2573

 

 

 

 

* No belt length change is required with a 31 tooth pulley
** = Belt Change Required
***Cruising RPM in 6th at 75 MPH. Compared to 3179 RPM with a stock 5-speed

Zero Offset, Steel Pulley

 

Zero Offset Steel Pulley
Machined from billet rounds of 1045, these stock replacements are toughest pulleys available on the market. With lightening holes added to help reduce rotating mass, and a maximized cross section reach the balance between strength and weight reduction, they are a step above the mass produced stock units. Available in the following tooth counts.

29 Tooth Pulley, PN 29BD-56F

30 Tooth Pulley, PN 30BD-56F

31 Tooth Pulley, PN 31BD-56F

32 Tooth Pulley, PN 32BD-56F

 

 

 

 

 

 

Zero Offset, Low Profile Pulley

 

Low Profile Steel Pulley
These pulleys were made in response to ever decreasing belt widths available on the aftermarket. With pulley you can sneak in the next size tire, or get that compact look that you are after.
32 Tooth Pulley, PN RT292
 

 

 

 

 

 

 

 

 

 

 

.250″ Offset Steel Pulley

 

.250″ Offset Steel Pulley
All the same features and quality as our zero offset steel pulleys, but in a .250″ offset version.
32 Tooth Pulley, PN 32BDN-56-.25

 

 

 

 

 

 

 

 

 

 

 

 

 

.500″ Offset Steel Pulley

 

.500″ Offset Steel Pulley
All the same features and quality as our zero offset steel pulleys, but in a .500″ offset version.
32 Tooth Pulley, PN 32BDN-56-.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.800″ Offset Steel Pulley

 

.800″ Offset Steel Pulley
All the same features and quality as our zero offset steel pulleys, but in a .800″ offset version.
32 Tooth Pulley, PN 32BDN-56-.8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.875″ Offset Steel Pulley

 

.875″ Offset Steel Pulley
All the same features and quality as our zero offset steel pulleys, but in a .875″ offset version.
32 Tooth Pulley, PN 32TM-56

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ALUMINUM ALLOY RACE PULLEYS

BAKER race pulleys are the lightest pulleys available. A stock 32 tooth Harley pulley weighs 5.2 lbs and our 32 tooth race pulley weights 2.0 lbs; a 61% weight savings. This weight difference means much less ‘flywheel effect’ and allows your engine to rev quicker. Absolutely required for performance applications. Race pulleys are hard anodized for wear resistance and corrosion protection.

Zero Offset Aluminum Pulley

 

 

 

Zero Offset Aluminum Pulley

Machined from billet rounds of 7075, these stock replacements are toughest pulleys available on the market. With lightening holes added to help reduce rotating mass, and a maximized cross section reach the balance between strength and weight reduction, they are a step above any pulleys on the market for racing applications. Available in the following tooth counts.29 Tooth Pulley, PN 29BD-56

30 Tooth Pulley, PN 30BD-56

31 Tooth Pulley, PN 31BD-56

32 Tooth Pulley, PN 32BD-56

33 Tooth Pulley, PN 32BD-56

 

 

 

 

 

 

 

 

1.5″ Offset Aluminum Pulley

 

1.5″ Offset Aluminum Pulley
All the same features and quality as our zero offset aluminum pulleys, but in a 1.5″ offset version.
32 Tooth Pulley, PN 32BD-56-1.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.0″ Offset Aluminum Pulley

 

2.0″ Offset Aluminum Pulley
All the same features and quality as our zero offset aluminum pulleys, but in a 2.0″ offset version.
32 Tooth Pulley, PN 32BD-56-2.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.5 Offset Aluminum Pulley

 

2.5″ Offset Aluminum Pulley
All the same features and quality as our zero offset aluminum pulleys, but in a 2.5″ offset version.
32 Tooth Pulley, PN 32BD-56-2.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sprocket Spacer (Late)

 

SPROCKET SPACER (LATE)
If you are a seasoned technician, you have seen a severely worn sprocket spacer. Over time and miles with dirt and grit, the stock 33344-94 spacer is too soft and it gets gouged by the seal that rides against it. As the spacer gets gouged, the seal relaxes. When the seal relaxes, the leaks begin. Our sprocket spacer is a direct replacement for the stock spacer except ours is case hardened steel that has a Rockwell ‘C’ hardness of 55. No more gouging, no more leaks.

 

PN 33344-94S, 1994-06 Big Twin & Sportster (except 06 Dyna)

 

 

 

 

 

Sprocket Spacer (Early)

 

SPROCKET SPACER (EARLY)
If you are a seasoned technician, you have seen a severely worn sprocket spacer. Over time and miles with dirt and grit, the stock 33334-85 spacer is too soft and it gets gouged by the seal that rides against it. As the spacer gets gouged, the seal relaxes. When the seal relaxes, the leaks begin. We got smart over the years and changed to OD of this sprocket spacer to work with the more commonly found PN12067B seal. Our sprocket spacer is a direct replacement for the stock spacer except ours is case hardened steel that has a Rockwell ‘C’ hardness of 55. No more gouging, no more leaks.

 

PN 33334-85B, 1985-93 Big Twin & Sportster

 

 

 

 

 

 

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