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Professor Motor is proud to offer the following technical information for chassis tuning.  Lower gear ratios (higher ratio numbers) give your car faster acceleration out of a corner, higher gear ratios (lower ratio numbers) gives your car faster top speed.  The final selection of a gear ratio is dependent on many factors and is by nature a compromise in trying to achieve the best possible performance.  This ratio chart is sorted in decreasing order of the resultant ratios.

 

DOWNLOAD (PDF) UNIVERSAL GEAR RATIO CHART FOR ANY SCALE / TYPE OF GEARS : link 

 

APPLICATION NOTE : Not all of these ratios may be suitable for every application since tire size and the resulting ground clearance will limit the possible combinations of gears that can be used.

 

Professor Motor Sidewinder / Anglewinder (Spur) Axle Gear / Gear Size

for Fly, GB Track, TSRF, Scalextric & Slot.it HRS 1 Chassis Applications 

Professor Motor Pinion Gear / Gear Size

Gear Ratio

PMTR1106 / 47 tooth spur gear (sidewinder / anglewinder)

PMTR1080 / 12 tooth pinion gear (sidewinder / anglewinder)

3.92 : 1

PMTR1089 / 46 tooth spur gear (sidewinder / anglewinder)

PMTR1103 / 13 tooth pinion gear (sidewinder / anglewinder)

3.54 : 1

PMTR1088 / 45 tooth spur gear (sidewinder / anglewinder)

PMTR1104 / 14 tooth pinion gear (sidewinder / anglewinder)

3.21 : 1

PMTR1087 / 44 tooth spur gear (sidewinder / anglewinder)

PMTR1105 / 15 tooth pinion gear (sidewinder / anglewinder)

2.93 : 1

 

Professor Motor Sidewinder / Anglewinder (Spur) Axle Gear / Gear Size

for Pro Slot & Slot.it HRS 2 Chassis Applications

Professor Motor Pinion Gear / Gear Size

Gear Ratio

PMTR1106 / 47 tooth spur gear (sidewinder / anglewinder)

PMTR1078 / 10 tooth pinion gear (sidewinder / anglewinder)

4.70 : 1

PMTR1089 / 46 tooth spur gear (sidewinder / anglewinder)

PMTR1079 / 11 tooth pinion gear (sidewinder / anglewinder)

4.18 : 1

PMTR1088 / 45 tooth spur gear (sidewinder / anglewinder)

PMTR1080 / 12 tooth pinion gear (sidewinder / anglewinder)

3.75 : 1

PMTR1087 / 44 tooth spur gear (sidewinder / anglewinder)

PMTR1103 / 13 tooth pinion gear (sidewinder / anglewinder)

3.38 : 1

 

Slot.it Inline (Crown) Axle Gear / Gear Size 

Slot.it or Professor Motor Pinion Gear

Gear Ratio

SIGI30AL /SIGI30BZ /SIGO30BZ / 30 tooth crown gear (inline)

SIPI08 / 8 tooth pinion gear (inline)

3.75 : 1

SIGI29AL /SIGI29BZ /SIGO29BZ / 29 tooth crown gear (inline)

SIPI08 / 8 tooth pinion gear (inline)

3.63 : 1

SIGI28AL /SIGI28BZ /SIGO28BZ / 28 tooth crown gear (inline)

SIPI08 / 8 tooth pinion gear (inline)

3.50 : 1

SIGI27AL /SIGI27BZ /SIGO27BZ / 27 tooth crown gear (inline)

SIPI08 / 8 tooth pinion gear (inline)

3.38 : 1

SIGI30AL /SIGI30BZ /SIGO30BZ / 30 tooth crown gear (inline)

PMTR1066 or SIPI09 9 tooth pinion gear (inline)

3.33 : 1

SIGI26AL /SIGI26BZ /SIGO26BZ / 26 tooth crown gear (inline)

SIPI08 / 8 tooth pinion gear (inline)

3.25 : 1

SIGI29AL /SIGI29BZ /SIGO29BZ / 29 tooth crown gear (inline)

PMTR1066 or SIPI09 9 tooth pinion gear (inline)

3.22 : 1

SIGI25AL /SIGI25BZ /SIGO25BZ / 25 tooth crown gear (inline)

SIPI08 / 8 tooth pinion gear (inline)

3.13 : 1

SIGI28AL /SIGI28BZ /SIGO28BZ / 28 tooth crown gear (inline)

PMTR1066 or SIPI09 9 tooth pinion gear (inline)

3.11 : 1

SIGI30AL /SIGI30BZ /SIGO30BZ / 30 tooth crown gear (inline)

SIPI10 / 10 tooth pinion gear (inline)

3.00 : 1

SIGI27AL /SIGI27BZ /SIGO27BZ / 27 tooth crown gear (inline)

PMTR1066 or SIPI09 9 tooth pinion gear (inline)

3.00 : 1

SIGI24AL /SIGI24BZ /SIGO24BZ / 24 tooth crown gear (inline)

SIPI08 / 8 tooth pinion gear (inline)

3.00 : 1

SIGI29AL /SIGI29BZ /SIGO29BZ / 29 tooth crown gear (inline)

SIPI10 / 10 tooth pinion gear (inline)

2.90 : 1

SIGI26AL /SIGI26BZ /SIGO26BZ / 26 tooth crown gear (inline)

PMTR1066 or SIPI09 9 tooth pinion gear (inline)

2.89 : 1

SIGI23AL /SIGI23BZ /SIGO23BZ / 23 tooth crown gear (inline)

SIPI08 / 8 tooth pinion gear (inline)

2.88 : 1

SIGI28AL /SIGI28BZ /SIGO28BZ / 28 tooth crown gear (inline)

SIPI10 / 10 tooth pinion gear (inline)

2.80 : 1

SIGI25AL /SIGI25BZ /SIGO25BZ / 25 tooth crown gear (inline)

PMTR1066 or SIPI09 9 tooth pinion gear (inline)

2.78 : 1

SIGI30AL /SIGI30BZ /SIGO30BZ / 30 tooth crown gear (inline)

SIPI11 / 11 tooth pinion gear (inline)

2.73 : 1

SIGI27AL /SIGI27BZ /SIGO27BZ / 27 tooth crown gear (inline)

SIPI10 / 10 tooth pinion gear (inline)

2.70 : 1

SIGI24AL /SIGI24BZ /SIGO24BZ / 24 tooth crown gear (inline)

PMTR1066 or SIPI09 9 tooth pinion gear (inline)

2.67 : 1

SIGI29AL /SIGI29BZ /SIGO29BZ / 29 tooth crown gear (inline)

SIPI11 / 11 tooth pinion gear (inline)

2.64 : 1

SIGI26AL /SIGI26BZ /SIGO26BZ / 26 tooth crown gear (inline)

SIPI10 / 10 tooth pinion gear (inline)

2.60 : 1

SIGI23AL /SIGI23BZ /SIGO23BZ / 23 tooth crown gear (inline)

PMTR1066 or SIPI09 9 tooth pinion gear (inline)

2.56 : 1

SIGI28AL /SIGI28BZ /SIGO28BZ / 28 tooth crown gear (inline)

SIPI11 / 11 tooth pinion gear (inline)

2.55 : 1

SIGI25AL /SIGI25BZ /SIGO25BZ / 25 tooth crown gear (inline)

SIPI10 / 10 tooth pinion gear (inline)

2.50 : 1

SIGI27AL /SIGI27BZ /SIGO27BZ / 27 tooth crown gear (inline)

SIPI11 / 11 tooth pinion gear (inline)

2.45 : 1

SIGI24AL /SIGI24BZ /SIGO24BZ / 24 tooth crown gear (inline)

SIPI10 / 10 tooth pinion gear (inline)

2.40 : 1

SIGI26AL /SIGI26BZ /SIGO26BZ / 26 tooth crown gear (inline)

SIPI11 / 11 tooth pinion gear (inline)

2.36 : 1

SIGI23AL /SIGI23BZ /SIGO23BZ / 23 tooth crown gear (inline)

SIPI10 / 10 tooth pinion gear (inline)

2.30 : 1

SIGI25AL /SIGI25BZ /SIGO25BZ / 25 tooth crown gear (inline)

SIPI11 / 11 tooth pinion gear (inline)

2.27 : 1

SIGI24AL /SIGI24BZ /SIGO24BZ / 24 tooth crown gear (inline)

SIPI11 / 11 tooth pinion gear (inline)

2.18 : 1

SIGI23AL /SIGI23BZ /SIGO23BZ / 23 tooth crown gear (inline)

SIPI11 / 11 tooth pinion gear (inline)

2.09 : 1

 

  

Slot.it Sidewinder (Spur) Axle Gear / Gear Size

for Fly, GB Track, TSRF, Scalextric & Slot.it HRS 1 Chassis 

Professor Motor, Slot.it or Sloting Plus Motor Pinion Gear

Gear Ratio

SIGS03 / SIGS1938 38 tooth spur gear (sidewinder)

SIPS10 / SIPI6510E / SLPL16510 / SLPL26510 10 tooth pinion gear (sidewinder)

3.80 : 1

SIGS02 / SIGS1936 36 tooth spur gear (sidewinder)

SIPS10 / SIPI6510E / SLPL16510 / SLPL26510 10 tooth pinion gear (sidewinder)

3.60 : 1

SIGS03 / SIGS1938 38 tooth spur gear (sidewinder)

PMTR1068 / SIPS11 / SIPI6511E / SLPL16511 / SLPL26511  11 tooth pinion gear (sidewinder)

3.45 : 1

SIGS01 / SIGS1934 34 tooth spur gear (sidewinder)

SIPS10 / SIPI6510E / SLPL16510 / SLPL26510 10 tooth pinion gear (sidewinder)

3.40 : 1

SIGS02 / SIGS1936 36 tooth spur gear (sidewinder)

PMTR1068 / SIPS11 / SIPI6511E / SLPL16511 / SLPL26511 11 tooth pinion gear (sidewinder)

3.27 : 1

SIGS03 / SIGS1938 38 tooth spur gear (sidewinder)

SIPS12 / SIPI6512E / SLPL16512 / SLPL26512 12 tooth pinion gear (sidewinder)

3.17 : 1

SIGS01 / SIGS1934 34 tooth spur gear (sidewinder)

PMTR1068 / SIPS11 / SIPI6511E 11 tooth pinion gear (sidewinder)

3.09 : 1

SIGS02 / SIGS1936 36 tooth spur gear (sidewinder)

SIPS12 / SIPI6512E / SLPL16512 / SLPL26512 tooth pinion gear (sidewinder)

3.00 : 1

SIGS03 / SIGS1938 38 tooth spur gear (sidewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear (sidewinder)

2.92 : 1

SIGS01 / SIGS1934 34 tooth spur gear (sidewinder)

SIPS12 / SIPI6512E / SLPL16512 / SLPL26512 12 tooth pinion gear (sidewinder)

2.83 : 1

SIGS02 / SIGS1936 36 tooth spur gear (sidewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear (sidewinder)

2.77 : 1

SIGS01 / SIGS1934 34 tooth spur gear (sidewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear (sidewinder)

2.62 : 1

 

  

Slot.it Sidewinder (Spur) Axle Gear / Gear Size

for Pro Slot & Slot.it HRS 2 Chassis Applications

Professor Motor, Slot.it or Sloting Plus Motor Pinion Gear

Gear Ratio

SIGS06 36 tooth spur gear (sidewinder)

SIPS10 / SIPI6510E / SLPL16510 / SLPL26510 10 tooth pinion gear (sidewinder)

3.60 : 1

SIGS1835 35 tooth spur gear (sidewinder)

SIPS10 / SIPI6510E / SLPL16510 / SLPL26510 10 tooth pinion gear (sidewinder)

3.50 : 1

SIGS05 / SIGS1834 34 tooth spur gear (sidewinder)

SIPS10 / SIPI6510E / SLPL16510 / SLPL26510 10 tooth pinion gear (sidewinder)

3.40 : 1

SIGS1833 33 tooth spur gear (sidewinder)

SIPS10 / SIPI6510E / SLPL16510 / SLPL26510 10 tooth pinion gear (sidewinder)

3.30 : 1

SIGS06 36 tooth spur gear (sidewinder)

PMTR1068 / SIPS11 / SIPI6511E / SLPL16511 / SLPL26511 11 tooth pinion gear (sidewinder)

3.27 : 1

SIGS04 / SIGS1832 32 tooth spur gear (sidewinder)

SIPS10 / SIPI6510E / SLPL16510 / SLPL26510 10 tooth pinion gear (sidewinder)

3.20 : 1

SIGS1835 35 tooth spur gear (sidewinder)

PMTR1068 / SIPS11 / SIPI6511E / SLPL16511 / SLPL26511 11 tooth pinion gear (sidewinder)

3.18 : 1

SIGS1831 31 tooth spur gear (sidewinder)

SIPS10 / SIPI6510E / SLPL16510 / SLPL26510 10 tooth pinion gear (sidewinder)

3.10 : 1

SIGS05 / SIGS1834 34 tooth spur gear (sidewinder)

PMTR1068 / SIPS11 / SIPI6511E / SLPL16511 / SLPL26511 11 tooth pinion gear (sidewinder)

3.09 : 1

SIGS1833 33 tooth spur gear (sidewinder)

PMTR1068 / SIPS11 / SIPI6511E / SLPL16511 / SLPL26511 11 tooth pinion gear (sidewinder)

3.00 : 1

SIGS06 36 tooth spur gear (sidewinder)

SIPS12 / SIPI6512E / SLPL16512 / SLPL26512 12 tooth pinion gear (sidewinder)

3.00 : 1

SIGS1835 35 tooth spur gear (sidewinder)

SIPS12 / SIPI6512E / SLPL16512 / SLPL26512 12 tooth pinion gear (sidewinder)

2.92 : 1

SIGS04 / SIGS1832 32 tooth spur gear (sidewinder)

PMTR1068 / SIPS11 / SIPI6511E / SLPL16511 / SLPL26511 11 tooth pinion gear (sidewinder)

2.91 : 1

SIGS05 / SIGS1834 34 tooth spur gear (sidewinder)

SIPS12 / SIPI6512E / SLPL16512 / SLPL26512 12 tooth pinion gear (sidewinder)

2.83 : 1

SIGS1831 31 tooth spur gear (sidewinder)

PMTR1068 / SIPS11 / SIPI6511E / SLPL16511 / SLPL26511 11 tooth pinion gear (sidewinder)

2.82 : 1

SIGS06 36 tooth spur gear (sidewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear (sidewinder)

2.77 : 1

SIGS1833 33 tooth spur gear (sidewinder)

SIPS12 / SIPI6512E / SLPL16512 / SLPL26512 12 tooth pinion gear (sidewinder)

2.75 : 1

SIGS1835 35 tooth spur gear (sidewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear (sidewinder)

2.69 : 1

SIGS04 / SIGS1832 32 tooth spur gear (sidewinder)

SIPS12 / SIPI6512E / SLPL16512 / SLPL26512 12 tooth pinion gear (sidewinder)

2.67 : 1

SIGS05 / SIGS1834 34 tooth spur gear (sidewinder)

SIPS13 / 13 tooth pinion gear (sidewinder)

2.62 : 1

SIGS1831 31 tooth spur gear (sidewinder)

SIPS12 / SIPI6512E / SLPL16512 / SLPL26512 12 tooth pinion gear (sidewinder)

2.58 : 1

SIGS1833 33 tooth spur gear (sidewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear (sidewinder)

2.54 : 1

SIGS04 / SIGS1832 32 tooth spur gear (sidewinder)

SIPS13 / 13 tooth pinion gear (sidewinder)

2.46 : 1

SIGS1831 31 tooth spur gear (sidewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear (sidewinder)

2.38 : 1

 

  

Slot.it / Sloting Plus ANGLEWINDER Axle Gear

for Pro Slot & Slot.it HRS 2 Chassis Applications

Professor Motor, Slot.it or Sloting Plus Motor Pinion Gear

Gear Ratio

SIGA36 36 tooth spur gear (anglewinder)

SIPS10 / SIPI6510E / SIPI6510E / SIPI6010O / SLPL16510 / SLPL26510 10 tooth pinion gear

3.60 : 1

SIGA34 34 tooth spur gear (anglewinder)

SIPS10 / SIPI6510E / SIPI6510E / SIPI6010O / SLPL16510 / SLPL26510 10 tooth pinion gear

3.40 : 1

SIGA36 36 tooth spur gear (anglewinder)

PMTR1068 / SIPS11 / SIPI6511E / SIPI6011O / SIPI6711O / SLPL16511 / SLPL26511 11 tooth pinion gear

3.27 : 1

SIGA32 / SLPL8032 32 tooth spur gear (anglewinder)

SIPS10 / SIPI6510E / SIPI6510E / SIPI6010O / SLPL16510 / SLPL26510 10 tooth pinion gear

3.20 : 1

SLPL8031 31 tooth spur gear (anglewinder)

SIPS10 / SIPI6510E / SIPI6510E / SIPI6010O / SLPL16510 / SLPL26510 10 tooth pinion gear

3.10 : 1

SIGA34 34 tooth spur gear (anglewinder)

PMTR1068 / SIPS11 / SIPI6511E / SIPI6011O / SIPI6711O / SLPL16511 / SLPL26511 11 tooth pinion gear

3.09 : 1

SIGA36 36 tooth spur gear (anglewinder)

SIPS12 / SIPI6512E / SIPS6712O / SLPL16512 / SLPL26512 12 tooth pinion gear

3.00 : 1

SIGA30 / SIGA1630E / SLPL8030 30 tooth spur gear (anglewinder)

SIPS10 / SIPI6510E / SIPI6510E / SIPI6010O / SLPL16510 / SLPL26510 10 tooth pinion gear

3.00 : 1

SIGA32 / SLPL8032 32 tooth spur gear (anglewinder)

PMTR1068 / SIPS11 / SIPI6511E / SIPI6011O / SIPI6711O / SLPL16511 / SLPL26511 11 tooth pinion gear

2.91 : 1

SIGA29 / SIGA1629E / SIGA1629-PL / SLPL8029 29 tooth spur gear (anglewinder)

SIPS10 / SIPI6510E / SIPI6510E / SIPI6010O / SLPL16510 / SLPL26510 10 tooth pinion gear

2.90 : 1

SIGA34 34 tooth spur gear (anglewinder)

SIPS12 / SIPI6512E / SIPS6712O / SLPL16512 / SLPL26512 12 tooth pinion gear

2.83 : 1

SLPL8031 31 tooth spur gear (anglewinder)

PMTR1068 / SIPS11 / SIPI6511E / SIPI6011O / SIPI6711O / SLPL16511 / SLPL26511 11 tooth pinion gear

2.82 : 1

SIGA28 / SIGA1628-PL / SLPL8028 28 tooth spur gear (anglewinder)

SIPS10 / SIPI6510E / SIPI6510E / SIPI6010O / SLPL16510 / SLPL26510 10 tooth pinion gear

2.80 : 1

SIGA36 36 tooth spur gear (anglewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear

2.77 : 1

SIGA30 / SIGA1630E / SLPL8030 30 tooth spur gear (anglewinder)

PMTR1068 / SIPS11 / SIPI6511E / SIPI6011O / SIPI6711O / SLPL16511 / SLPL26511 11 tooth pinion gear

2.73 : 1

SIGA27 / SIGA1627E / SIGA1627-PL / SLPL8027 27 tooth spur gear (anglewinder)

SIPS10 / SIPI6510E / SIPI6510E / SIPI6010O / SLPL16510 / SLPL26510 10 tooth pinion gear

2.70 : 1

SIGA32 / SLPL8032 32 tooth spur gear (anglewinder)

SIPS12 / SIPI6512E / SIPS6712O / SLPL16512 / SLPL26512 12 tooth pinion gear

2.67 : 1

SIGA29 / SIGA1629E / SIGA1629-PL / SLPL8029 29 tooth spur gear (anglewinder)

PMTR1068 / SIPS11 / SIPI6511E / SIPI6011O / SIPI6711O / SLPL16511 / SLPL26511 11 tooth pinion gear

2.64 : 1

SIGA34 34 tooth spur gear (anglewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear

2.62 : 1

SIGA26 / SIGA1626E / SIGA26LH / SIGA1526-PL / SLPL8026 26 tooth spur gear (anglewinder)

SIPS10 / SIPI6510E / SIPI6510E / SIPI6010O / SLPL16510 / SLPL26510 10 tooth pinion gear

2.60 : 1

SLPL8031 31 tooth spur gear (anglewinder)

SIPS12 / SIPI6512E / SIPS6712O / SLPL16512 / SLPL26512 12 tooth pinion gear

2.58 : 1

SIGA28 / SIGA1628-PL / SLPL8028 28 tooth spur gear (anglewinder)

PMTR1068 / SIPS11 / SIPI6511E / SIPI6011O / SIPI6711O / SLPL16511 / SLPL26511 11 tooth pinion gear

2.55 : 1

SIGA25LH / SIGA1525-PL / SLPL8025 25 tooth spur gear (anglewinder)

SIPS10 / SIPI6510E / SIPI6510E / SIPI6010O / SLPL16510 / SLPL26510 10 tooth pinion gear

2.50 : 1

SIGA30 / SIGA1630E / SLPL8030 30 tooth spur gear (anglewinder)

SIPS12 / SIPI6512E / SIPS6712O / SLPL16512 / SLPL26512 12 tooth pinion gear

2.50 : 1

SIGA32 / SLPL8032 32 tooth spur gear (anglewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear

2.46 : 1

SIGA27 / SIGA1627E / SIGA1627-PL / SLPL8027 27 tooth spur gear (anglewinder)

PMTR1068 / SIPS11 / SIPI6511E / SIPI6011O / SIPI6711O / SLPL16511 / SLPL26511 11 tooth pinion gear

2.45 : 1

SIGA29 / SIGA1629E / SIGA1629-PL / SLPL8029 29 tooth spur gear (anglewinder)

SIPS12 / SIPI6512E / SIPS6712O / SLPL16512 / SLPL26512 12 tooth pinion gear

2.42 : 1

SIGA24LH / SIGA1524-PL 24 tooth spur gear (anglewinder)

SIPS10 / SIPI6510E / SIPI6510E / SIPI6010O / SLPL16510 / SLPL26510 10 tooth pinion gear

2.40 : 1

SLPL8031 31 tooth spur gear (anglewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear

2.38 : 1

SIGA26 / SIGA1626E / SIGA26LH / SIGA1526-PL / SLPL8026 26 tooth spur gear (anglewinder)

PMTR1068 / SIPS11 / SIPI6511E / SIPI6011O / SIPI6711O / SLPL16511 / SLPL26511 11 tooth pinion gear

2.36 : 1

SIGA28 / SIGA1628-PL / SLPL8028 28 tooth spur gear (anglewinder)

SIPS12 / SIPI6512E / SIPS6712O / SLPL16512 / SLPL26512 12 tooth pinion gear

2.33 : 1

SIGA30 / SIGA1630E / SLPL8030 30 tooth spur gear (anglewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear

2.31 : 1

SIGA25LH / SIGA1525-PL / SLPL8025 25 tooth spur gear (anglewinder)

PMTR1068 / SIPS11 / SIPI6511E / SIPI6011O / SIPI6711O / SLPL16511 / SLPL26511 11 tooth pinion gear

2.27 : 1

SIGA27 / SIGA1627E / SIGA1627-PL / SLPL8027 27 tooth spur gear (anglewinder)

SIPS12 / SIPI6512E / SIPS6712O / SLPL16512 / SLPL26512 12 tooth pinion gear

2.25 : 1

SIGA29 / SIGA1629E / SIGA1629-PL / SLPL8029 29 tooth spur gear (anglewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear

2.23 : 1

SIGA24LH / SIGA1524-PL 24 tooth spur gear (anglewinder)

PMTR1068 / SIPS11 / SIPI6511E / SIPI6011O / SIPI6711O / SLPL16511 / SLPL26511 11 tooth pinion gear

2.18 : 1

SIGA26 / SIGA1626E / SIGA26LH / SIGA1526-PL / SLPL8026 26 tooth spur gear (anglewinder)

SIPS12 / SIPI6512E / SIPS6712O / SLPL16512 / SLPL26512 12 tooth pinion gear

2.17 : 1

SIGA28 / SIGA1628-PL / SLPL8028 28 tooth spur gear (anglewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear

2.15 : 1

SIGA25LH / SIGA1525-PL / SLPL8025 25 tooth spur gear (anglewinder)

SIPS12 / SIPI6512E / SIPS6712O / SLPL16512 / SLPL26512 12 tooth pinion gear

2.08 : 1

SIGA27 / SIGA1627E / SIGA1627-PL / SLPL8027 27 tooth spur gear (anglewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear

2.08 : 1

SIGA24LH / SIGA1524-PL 24 tooth spur gear (anglewinder)

SIPS12 / SIPI6512E / SIPS6712O / SLPL16512 / SLPL26512 12 tooth pinion gear

2.00 : 1

SIGA26 / SIGA1626E / SIGA26LH / SIGA1526-PL / SLPL8026 26 tooth spur gear (anglewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear

2.00 : 1

SIGA25LH / SIGA1525-PL / SLPL8025 25 tooth spur gear (anglewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear

1.92 : 1

SIGA24LH / SIGA1524-PL 24 tooth spur gear (anglewinder)

SIPS13 / SIPI6513E 13 tooth pinion gear

1.85 : 1

TSRF Sidewinder (Spur) Axle Gear / Gear Size

for Fly, GB Track, TSRF, Scalextric & Slot.it HRS 1 Chassis Applications 

Professor Motor or TSRF Motor (64 pitch) Pinion Gear

Gear Ratio

THPR48 / 48 tooth spur gear (sidewinder)

11 tooth pinion gear (sidewinder)

4.36 : 1

THPR47 / 47 tooth spur gear (sidewinder)

12 tooth pinion gear (sidewinder)

3.92 : 1

THPR46 / 46 tooth spur gear (sidewinder)

13 tooth pinion gear (sidewinder)

3.54 : 1

THPR45 / 45 tooth spur gear (sidewinder)

14 tooth pinion gear (sidewinder)

3.21: 1