Velocette Gearbox

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Five speed racing gear set

Designed to fit the standard Velocette road type gear box shells with only one small modification to part of the ratchet change mechanism.

All gears have 3 undercut engagement dogs for fast changes and positive retention.  We supply both shafts with all the gears assembled plus three selector forks, cam plate and actuating pawl, together with a layshaft bearing carrier which replaces the standard kick start boss. Alternatively, for road use,  we can supply a kick start ratcheted gear, in which cast the standard kick start boss is retained.

The gearboxes are supplied with a 19 tooth sprocket, additional sprockets are available as required.

Nova Gearset Ratios                                 % drop

1st   21 - 27   x  D.R.   =   2.250:1
                                                                )       29.0%
2nd  23 - 21   x  D.R.   =   1.598:1
                                                                )       18.9%
3rd   27 - 20   x  D.R.   =   1.296:1
                                                                )       15.0%
4th   27 - 17   x  D.R.   =   1.102:1
                                                                )         9.3%
5th   16 - 28   x  D.R.   =   1.000:1

Overall reduction 1st - 5th                          55.5%

Drive ratio (D.R.) 16 - 28            1.750:1

 

These are avaible from VelocetteGearbox

http://www.velocettegearset.com

 

Six speed racing gear set

Designed to fit the standard Velocette road type gear box shells with only one small modification to part of the ratchet change mechanisms.

All gears have 3 undercut engagement dogs for fast changes and positive retention.  We supply both shafts with all the gears assembled plus three selector forks, cam plate and actuating pawl, together with a layshaft bearing carrier which replaces the standard kick start boss.

The gearboxes are supplied with a 19 tooth sprocket, additional sprockets are available.

 

Available With Superfinish

 

Our ratio's are as follows:
                                                          Percentage drop
1st   21  -  27   x  D.R.  = 2.250:1
                                                       )           22.22%
2nd  24  -  24   x  D.R.  = 1.750:1
                                                      )            17.37%
3rd  23  -  19   x  D.R.  = 1.446:1
                                                      )            14.87%
4th  27  -  19   x  D.R.  = 1.231:1
                                                      )            10.5%
5th  27  -  17  x   D.R.  = 1.102:1
                                                      )            9.25%
6th                                            1:1                                   

Drive ratio  16  -  28     1.75:1

Overall reduction 55.5%

 

Price £1350 + VAT (if applicable) & Carriage