Skip to main content
English French German Italian Spanish

Commando gearing

Forums

Now then...I now have a Registration number from the DVLA and have been for a trundle...clearly I have a gearing issue..30mph/2000rpm it rockets up to 100mph in 5th at nearly 7000rpm, any thoughts?Norton 810 Sleeper

Permalink

Start by counting the teeth on the sprockets, you also need to work out what gearbox you have as any 5 speed is a special.

Permalink

Couple of extra teeth on the front sprocket should do the trick.

My new USA export 850 Mk2 Roadster came from the factory equipped with a 19 tooth front sprocket, changing to a 21 tooth sprocket done the trick for me.

 

Permalink

1) How do you keep the front wheel on the ground?

2) You may want to upgrade your front brake.

Permalink

If the the top gear ratio is the same for both 4 and 5-speed gearing, what benefit does it actually provide? For a track bike I can see that  it would be easier to keep the engine in its peak power range, but for a road bike, would it not just result in more gear changing?  There would likely be a reduction in load on the gear train (and shell), by not having to apply so much torque for acceleration with 5 speeds, so that could be helpful.  Is there anything else that would justify the expense for a road bike?

Permalink

I suppose when My bike was first manufactured back in November 1971 with its Mk4 cam and high comp pistons etc it was imagined that it would be less torquey and the extra gear possibly useful..I have to say, given the gearing..It tops out very quickly at 107mph or so...But it gets there much too easily..ie in 5th just rolling on. It does make an interesting comparison with my last machine 1982 Triumph TSS?

 

 


Norton Owners Club Website by White-Hot Design