Electronic rev counter...

[Nick Lettington]

After changing to Longstone 400/425 x 17 tyres on my late Ruby, the engine revs for a given speed seem a bit higher than with the previous 450s, so I measured the RPM v speedo speed again with an electronic rev counter:



Figures are rounded to the nearest 50rpm.  

In top gear, 1900rpm at 30mph and 2500rpm at 40mph seem reasonable.  In third, 30mpg is now 3150 rpm - with the larger tyres it was lower at about 3000rpm.  The big difference in ratios between third and top in the standard gearbox is now even more noticeable.

Did you push a little harder or is the extra 5mph due to the slightly lower gearing?