| AXLE SIZES |
| CARTRIX 2.4mm |
| FLY 2.38mm |
| FLY EVO 2.5mm |
| FLY RACING 2.48mm |
| FLY-TRUCK 2.38mm |
| HOBBY SLOT 2.44mm/2.38mm |
| NINCO 2.46mm |
| NINCO Racing 2.46mm |
| NSR 2.38mm |
| SCALEXTRIC 2.35mm |
| SCX 2.4mm |
| SLOTIT 2.38mm |
| SPIRIT 2.44mm |
SLOTIT GEAR RATIOS
| SIG101/5 | SIG102/6 | SIG103/7 | SIG104/8 | SIGS04 | SIGS01 | SIGS02 | SIGS03 | ||
| 24 IL | 26 IL | 28 IL | 30 IL | 32 SW | 34 SW | 36 SW | 38 SW | ||
| (PROSLOT) | |||||||||
| SIPI08 | 8 IL | 03-Jan | 3.25-1 | 3.5-1 | 3.75-1 | ||||
| SIPI09 | 9 IL | 2.66-1 | 2.88-1 | 3.11-1 | 3.33-1 | ||||
| SIPI10 | 10 IL | 2.4-1 | 2.6-1 | 2.8-1 | 3.0-1 | ||||
| SIPI11 | 11 IL | 2.18-1 | 2.36-1 | 2.54-1 | 2.72-1 | ||||
| SIPS10 | 10 SW | 3.2-1 | 3.4-1 | 3.6-1 | 3.8-1 | ||||
| SIPS11 | 11 SW | 2.90-1 | 3.09-1 | 3.27-1 | 3.45-1 | ||||
| SIPS12 | 12 SW | 2.66-1 | 2.83-1 | 3.0-1 | 3.16-1 | ||||
| SIPS13 | 13 SW | 2.46-1 | 2.61-1 | 2.77-1 | 2.92-1 |
LOWER GEAR RATIOS = MORE TOP SPEED / LESS ACCELERATION / LESS BRAKES- speed tracks
HIGHER GEAR RATIOS = LESS TOP SPEED /GREATER ACCELERATION/MORE BRAKES - rally tracks short twisty