In Stock


( £312.50 EXC VAT )

Our straight-cut close-ratio gear set for inline engines is machined on the very latest CNC machinery allowing us to offer a perfect gear tooth form.

Our straight-cut close-ratio gear set for the inline gearbox (Sprite and Midget) is machined on the very latest CNC machinery allowing us to offer a perfect gear tooth form. As with all of our gear sets, these are made locally in the Midlands so we can keep a constant eye on quality control.

The gear kit is produced from EN36C and case hardened along with molybdenum-sprayed baulk ring faces. ..

The kit comes complete with the following:

  • Laygear cluster
  • Second gear
  • Third gear
  • First motion - input gear

Ratios are as follows:

  • First - 2.573:1    
  • Second - 1.722:1    
  • Third - 1.255:1    
  • Fourth - 1:1

See the Additional Information tab for more detail.


Why are the gears straight-cut?
The design of helical-cut gears, as found in standard gearboxes, leads to increased side (or axial) loadings on the transmission. As power outputs increase, this places greater strain on the transmission casing and bearings, in turn leading to reduced reliability. Using straight-cut gears allows us to design a stronger transmission within the standard casing. 

Can I use a straight-cut gearbox on the road?
Yes, no problem. There is a myth that driving with a straight-cut gearbox on the road is hard work. In fact a straight-cut synchromesh gearbox is no different in operation to a regular gearbox. Most cars use a straight-cut first/reverse gear; it is the swap to a dog-engagement racing gearset that will affect the drivability of a road car. 

Are straight-cut gearboxes more noisy?
Yes, although the distinctive whine is more noticable from straight-cut drop gears than the gearbox itself. Many people prefer the noise in any case! 

What does close ratio mean?
There's less difference between the size of the gears, meaning a reduced engine rpm drop as the next gear is selected. This keeps the engine within its optimum power band more effectively, resulting in better accelation through the gears. Fourth gear is still the same 1:1 ratio, but first tends to be taller than with a standard gearset, to bring the ratios closer together. The final drive ratio and wheel size need to be carefully considered to give the best results - contact us if you're unsure.