Final Drive Gear Ratios |
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| 246 4-sp |
Type 247 5-sp | K75 | R259 5-sp |
1998-2006 six-speed * | New R1200 |
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|---|---|---|---|---|---|---|---|---|---|
| Std. | Race | Std. | Enduro | Sport |
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New R1200: Blank = not possible without going crazy. For instance, mating a twinshock final drive to a K-bike. Information is certain to be incomplete. All speeds assume 6.6 foot circumference wheel, no slippage. Display speed at 1200 or 5000 RPM *6-speed notes: K1200RS, R1200C, and GS Sport use 'Sport.' R1150GS Adventure uses 'Enduro.' K12LT used both Sport and Standard at different times. Graphics functions courtesy of Walter Zorn. More information on gearsets (for Airhead models) can be found at http://www.bmwmotorcycletech.info/ringgears,etc.htm. |
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Gear ratios
The following crown gearsets exist in BMW Monolever and Paralever motorcycles (not including Airheads). All have the same 20t pinion spline except for the early K100.
Type 1 pinion: 42mm tip to nut face, no groove (Airhead only)
Type 2 pinion: 28mm tip to nut face, no groove (K75/100 monolever)
Type 2a pinion: 28mm tip to nut face, no groove, 16-tooth pinion spline (early K100)
Type 3 pinion: 30mm tip to nutface, groove (K & R Paralever, R1200C)
| Ratio | Application | PN | Pinion type |
Impulse wheel? |
Other |
|---|---|---|---|---|---|
| 37/11 3.36 | K75 disc or drum | 33 12 1 454 595 | 2 | Yes | |
| R850R | 33 11 2 314 651 | 3 | |||
| 32/10 3.20 | R80GS/R | 33 12 1 457 556 | 1 | No | |
| K75 disc or drum | 33 12 1 457 062 | 2 | Yes | ||
| 34/11 3.09 | R1100RS early | 33 11 2 311 577 | 3 | ||
| R100R, GS, Mystic | 33 12 1 452 572 | 1 | 5-bolt | ||
| 33/11 3.00 | K100 before 2/86 | 33 12 1 451 711 | 2a | Yes | |
| K100 after 2/86 | 33 12 1 454 236 | 2 | Yes | ||
| R1100GS, R1100R | 33 11 2 311 186 | 3 | |||
| 32/11 2.91 | K100 before 2/86 | 33 12 1 451 712 | 2a | Yes | |
| K100 after 2/86 | 33 12 1 454 234 | 2 | Yes | ||
| K1100LT | 33 12 2 311 238 | 3 | Yes | ||
| R1100RT, 1150RT | 33 11 2 330 008 | 3 | |||
| 31/11 2.82 | K100 4V, K11RS | 33 12 2 310 641 | 3 | Yes | |
| R11RS/RT,1150GS/R/RS/GSAdv | 33 11 2 330 020 | 3 | |||
| 33/12 2.75 | K1, K11LT, K12RS/GT/LT | 33 12 2 310 140 | 3 | Yes | 5-bolt |
| R1100S, R850C | 33 12 2 332 615 | 3 | Yes | ||
| 34/13 2.62 | K12LT | 33 12 7 661 910 | 3 | Yes | 5-bolt |
| R1200CL | 33 12 7 670 761 | 3 | Yes | ||
| 33/13 2.54 | R1200C | 33 12 2 311 663 | 3 | Yes |
Pinion spline length
The spline on the Airhead Paralever pinion is longer. This is due to the fact that whereas the U-joints on most models are coaxial with the swingarm pivots, the U-joints on the Airhead driveshaft are about 12mm farther forward (at the front and rear of the swingarm). Rather than have a very long nose on the rear U-joint, BMW extended the pinion spline. All Paralever Airheads have the 3.09 gear ratio, so only one gearset is affected by this change.
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