Hello,
    With all the recent talk of tall tires, I am interested in attempting to
determine what rpms my motor will be turning at a given speed.  I know that
there is a formula that incorporates tire diameter as well as final drive
and other factors, I just can't find it.  While my tranny (DZ) is not listed
on Helmut's page, I'm sure that the other diesel trannies are similar enough
for my usage, which is to determine whether or not I need to swap to an air
cooled gearbox for best usage of my I-4 conversion.  Sorry to ramble.  TIA,
Scott

'82 FrankenWesty
'87 Jetta GLI
'81 Wabbit Convertible
'74 Thing

and thanks to the screws in my knee I can't drive any of them right now!