Katana Sprockets Page for 47-Tooth Rear Models:
This chart is to give you a quick way of looking up what percentage of change you can
expect by altering the sprockets on your Katana (applies to 98+ GSX600F & some 98+ GSX750F [varies by market], and may apply to other
years and models as well). If you have a GSX750F with a 45-tooth rear sprocket as stock on your model, visit this webpage instead:
GSX750F "45-Tooth Rear" Sprocket Tables
The formula's for calculating sprocket ratio math can be found in
How To's: Understand Motorcycle Sprocket Math and Drive Ratios
| Front Sprocket Tooth Count |
Rear Sprocket Tooth Count |
Sprocket Ratio | Percentage of Change |
|||
| 13 | 44 | 3.385 | 8.02% | |||
| 13 | 45 | 3.462 | 10.48% | |||
| 13 | 46 | 3.538 | 12.93% | |||
| 13 | 47 | 3.615 | 15.39% | |||
| 13 | 48 | 3.692 | 17.84% | |||
| 13 | 49 | 3.769 | 20.30% | |||
| 13 | 50 | 3.846 | 22.75% | |||
| 13 | 51 | 3.923 | 25.21% | |||
| 13 | 52 | 4.000 | 27.66% | |||
| 13 | 53 | 4.077 | 30.12% | |||
| 13 | 54 | 4.154 | 32.57% | |||
| 13 | 55 | 4.231 | 35.03% | |||
| 13 | 56 | 4.308 | 37.48% | |||
| 14 | 44 | 3.143 | 0.31% | |||
| 14 | 45 | 3.214 | 2.58% | |||
| 14 | 46 | 3.286 | 4.86% | |||
| 14 | 47 | 3.357 | 7.14% | |||
| 14 | 48 | 3.429 | 9.42% | |||
| 14 | 49 | 3.500 | 11.70% | |||
| 14 | 50 | 3.571 | 13.98% | |||
| 14 | 51 | 3.643 | 16.26% | |||
| 14 | 52 | 3.714 | 18.54% | |||
| 14 | 53 | 3.786 | 20.82% | |||
| 14 | 54 | 3.857 | 23.10% | |||
| 14 | 55 | 3.929 | 25.38% | |||
| 14 | 56 | 4.000 | 27.66% | |||
| 15 | 44 | 2.933 | - 6.38% | |||
| 15 | 45 | 3.000 | - 4.25% | |||
| 15 | 46 | 3.067 | - 2.13% | |||
| 15 | 47 | 3.133 | STOCK (0%) | |||
| 15 | 48 | 3.200 | 2.13% | |||
| 15 | 49 | 3.267 | 4.26% | |||
| 15 | 50 | 3.333 | 6.38% | |||
| 15 | 51 | 3.400 | 8.51% | |||
| 15 | 52 | 3.467 | 10.64% | |||
| 15 | 53 | 3.533 | 12.77% | |||
| 15 | 54 | 3.600 | 14.89% | |||
| 15 | 55 | 3.667 | 17.02% | |||
| 15 | 56 | 3.733 | 19.15% | |||
| 16 | 44 | 2.750 | - 12.23% | |||
| 16 | 45 | 2.813 | - 10.24% | |||
| 16 | 46 | 2.875 | - 8.24% | |||
| 16 | 47 | 2.938 | - 6.25% | |||
| 16 | 48 | 3.000 | - 4.25% | |||
| 16 | 49 | 3.063 | - 2.26% | |||
| 16 | 50 | 3.125 | - 0.26% | |||
| The below are only for reference, as it makes no sense to use a 16 tooth sprocket to get a positive gear ratio change (use the stock 15 tooth front sprocket instead)... | ||||||
| 16 | 51 | 3.188 | 1.73% | |||
| 16 | 52 | 3.250 | 3.72% | |||
| 16 | 53 | 3.313 | 5.72% | |||
| 16 | 54 | 3.375 | 7.71% | |||
| 16 | 55 | 3.438 | 9.71% | |||
| 16 | 56 | 3.500 | 11.70% | |||
SPECIAL NOTES:
- The Percentage change is the increase or decrease in available torque
compared to stock. It is also the percentage that your RPM's will
increase/decrease for any given steady speed (i.e. - if stock is 5000 RPM at 67
MPH, a 10% change will make the RPMs 5500 at 67 MPH. Additionally, if your bike
reads the speed off the front sprocket (all 98+ Katana's), your speedo will be
off by this amount as well. There are two products on the market to correct for
this inaccuracy: the SpeedoHealer
and the YellowBox.
- By altering the sprocket ratios to a positive percentage change, you are
trading some effective top-end HP for effective low-end torque. Torque
primarily affects acceleration between 0 and about 65 mph, while effective HP
affects speeds above 65 (especially top speed), and the ability to counteract
wind resistance. Expect a 12% - 15% change to cut around 15 - 20 MPH off your
top speed, because that HP you've traded is critical to overcoming the wind
resistance at high speeds. Also expect seriously degraded fuel-mileage as a result
of the trade-off.
- By altering the sprocket ratios to a negative percentage change, you are
trading some effective torque for increased effective HP, but this is likely to
only alter your gas mileage at steady cruising speeds, not increase your top
speed, as the actual total HP for the bike has not increased. The primary
reason for going with a negative percentage change is to reduce the RPM's
required to cruise at whatever standard cruising speed you ride at if you do a
lot of long-haul touring or commuting (e.g. - getting you out of a zone of vibration
if you happen to normally cruise right at the same RPM that the bike vibrates the most).
- Large percentage (more than 8% or so) changes in either direction (from stock) can produce undesirable results.
- Large positive percentage changes can cut your top speed significantly, reduce your effective traction under high throttle applications, and may cause the front end to become light or wheelie in response to the increase in torque.
- Large negative percentage changes can actually decrease your gas mileage if you are not cruising steady (as you try to compensate for sluggish performance by giving it more gas during acceleration), and will reduce your rate of acceleration (including out of a dangerous situations).
- The table reflects a wide range of possible combinations available (most that are likely to be used and then some), but other combinations
are out there and this table is not all-inclusive.
- Changes under 3% from your current ratio are not likely to be noticed by the rider.
- Whenever feasible to obtain a specific ratio, avoid using a smaller than stock front sprocket. The smaller sprocket requires the links of the chain to turn a tighter radius, which increases friction and decreases the life expectancy of the chain (by decreasing the life-expectancy of the o-ring seals of the chain).
