Just fitted a 44r on the track bike as Mallory will be first up this year, could be fun as the adjusters are fully wound in, tyre is mm's from the arm & chain (& will undoubtedly grow at speed).
16/44 with std chain for 98-03 milles, or equivalent for later models, suited me well for balls out road, nice short wheelbase too, as said can wear the side wallsa bit on some makes.