Honda VTR1000 Twin SP1 & SP2 Gearbox

Designed to complement the enhanced performances obtained from blueprinted and tuned engines.

The gearbox will allow you to use the full potential of improved performance. The positive engagement system, three undercut engagement dogs per gear, gives almost continuous power output to the rear wheel and extremely rapid shifting. The ratio’s are designed to give maximum acceleration in all gears unlike the road use gears supplied by Honda. By necessity a road machine must be tractable in town with two people and have a high cruising speed but not at peak revs. This effectively reduces the overall acceleration and obtainable top speed.

Superfinished in house as standard.

The percentage figures are, if multiplied by the engine rpm. will give the rev drop between the gears. For example, top gear on the road bike at 10,000 rpm is equivalent to 1,110 rpm, whereas the Race Bike ratio has a rev drop of 780rpm.

The overall reduction ratio for a race gearbox of this type of engine is normally around 55%, which means that 1st gear will always be slightly less than half the maximum speed obtainable, which differs considerably from the lower geared road bike as illustrated by these figures.

The gearbox comprises of input shaft and all loose gears. It is assembled using standard Honda bushes, spacers, circlips and output shaft from the original machine.

1st 16 -34 2.125:1
} 23.2%
} 17.2%
} 13.0%
} 11.0%
} 7.8%
2nd 19 – 31 1.631:1
3rd 20 – 27 1.350:1
4th 23 – 27 1.174:1
5th 23 – 24 1.043:1
6th 26 – 25 0.962:1
Overall reduction 1st – 6th 54.7%

1st 13 – 32 2.462:1
} 26.4%
} 21.2%
} 15.5%
} 10.5%
} 11.1%
2nd 16 – 29 1.813:1
3rd 21 – 30 1.429:1
4th 25 – 31 1.240:1
5th 25 – 27 1.080:1
6th 26 – 25 0.962:1
Overall reduction 1st – 6th 60.9%

Honda VTR1000 Twin SP1 & SP2 Gearbox

Price £2100.00

+VAT (if applicable) & Carriage