(29-07-2009, 04:38 PM)superted Wrote: That's all very well Smokey, but can you suggest how it is possible to speed control a classic? Of course they manage it at GPs and WSB - with an ECU it isn't a problem, but when you haven't even got a speedo? I can do some calculations based on wheel diameter etc. to use the tacho, but there is bound to be a large margin for error, and race day is going to be a bit late to find out just how large it is!

Only to a certain extent superteb. On the four strokes yes but the two stroke GP 250 and 125’s don’t have electronic speed limiters. They do exactly what you suggested. Calculate overall gearing and get a rev’s based reading the most inaccurate part of this is going to be your measurement of wheel diameter and rev counter accuracy. At the end of the day most rev counters are more accurate than a speedo and most road bike speedo’s are set up for a standard bike any change away from that would create inaccuracies. The other problem with that is speedo must be tapped up so would be no use anyway.

What they do have at GP’s since not all bikes have speed limiters is speed signs like you get on road works. I believe the MMCC is looking at installing these as well.

There are plenty of other solutions if you think latterly. I am working on one at the moment that is a simple self-contained unit that could be fitted to any bike. However the lack of time to build and test means I probably won’t get it done for this year.

For most of the classics it won’t be a problem so I guess your on a 250 two stroke? Having said that we worked out the revs on the 350 Ducati I will be riding in the Junior classic and it’s getting towards 6000rpm. So you could still ride it with a reasonable margin of error.

As an idea how about suggesting that they put signs up on the return road during practice week will give people a chance to test speed limiters/calculations.