23t
yep the stockers that came with the tamiya kit are slow (except for the tao4-pr0 blue) came witha type T
but the tuned 23t motors from Tamiya(Type T,R,RR and S), HPI, Kai, Yokomo and other companies are mighty fast!
most of them are fast when new and deteriorate after a few packs since they are not rebuildable but Tamiya and other companies are releasing the motors in rebuildable form.
23t are the standard in JMRCA for their stock division, right?
over here we try having a race with 23t and 27t, its almost the same in power but tuned 23t is a lot faster and also depends on the driver.