Small wheeled vehicle: judge speed of runs? (6,4)

'speed of runs?' is the definition.
(rate of scoring runs)

'small wheeled vehicle judge' is the wordplay.
I cannot quite see how this works, but
'small' could be 's' (abbreviation - e.g. clothes size) and 's' is present in the answer.
'vehicle' could be 'trike' (short for tricycle) and 'trike' is located in the answer.
'judge' could be 'rate' (rating is a kind of judging) and 'rate' is found in the answer.
No letters remain.
This may be the basis of clue (or it may be nonsense).