Whan he means is that it's the same reaction as putting a larger DRIVEN sprocket on.
Obviously, taking ONE tooth off the drive procket is NOT the same as adding ONE tooth to the DRIVEN sprocket.... at a rough guess it's like adding 4 teeth (errr.... 3.5 teeth) and that would have meant (probably) fitting a new chain as well.
Secondly, if you are already using a large driven sprocket, adding 4 more teeth could take your chain closer to the kerbs..... not that you are using the kerbs, of course.....
Thirdly, you INCREASE the gear ratio as you will not be carrying as much speed through the corner in the wet as you would the dry, thus your 'terminal speed' at the end of the straight will probably be less as well: hence not neeeding such a small 'rear-sprocket'.
4thly, you will be exiting the corner with a lower speed and thus lower revs.... thus raising the rear-sprocket will give you a better acceleation.... even if it is more slippery.
I wasn't sure which version of that answer was meant by your question..... so I gave 4 answers ... all valid.
Ian
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