Well this four sentence post quickly ballooned into a whole chain and sprocket guide for the V.
Quick intro to this subject. The wear life of a chain and sprocket is partly determined by maintenance and partly the sprockets and chain themselves. A chain/sprocket combo that causes the same chain link to hit the same sprocket tooth everytime will cause that tooth and link to wear much quicker than the rest. Ideally each time around the link is one tooth farther along than it was before, requiring it to visit each tooth in the sprocket before it hits the first one again. Manufactures generally choose a combination somewhere in the middle because achieving ideal wear while getting the ratio you want is difficult. The other considerations are how many contacts you get per distance (tool uses a mile) and the radius of the sprocket (smaller front sprockets accelerate the chain faster). Thus the trick is to either choose a middle ground ratio and put up with a little more wear or choose one of the ideal combinations. The final consideration is that each change will cause the distance between the drive sprocket and rear axle to move. This must be kept as close as possible to stock to allow it to fit in the adjustment slots in the swing arm. I haven't looked at the rear axle tensioner on a V so I can't speak for how much room there is to make these kinds of adjustments. However people seem to be getting away with a 43 tooth rear on the stock chain (114 links) which is +.510 inches but could cause you to run out adjustment before the chain is truly worn out.
For ideal wear both sprockets must be odd in contrast to the even number of links on the chain (don't use half-links!). Bike Bandit carries 13-16 tooth fronts and 39-46 tooth rears. Here is a partial list of combinations near the 15/44 ratio that don't result in poor wear. Ideal wear numbers match sprocket teeth, above half is good, below is poor.
~ Front/Rear-Chain ~ Ratio ~ Length Difference ~ Wear #s ~ Comments
~ 15/46-114 ~ 3.06 ~ .000 ~ 5/23 ~ Stock, ratio little a high, poor front wear
~ 16/46-114 ~ 2.88 ~ -.150 ~ 8/23 ~ 15/43-112 is better
~ 15/45-112 ~ 3.00 ~ -.460 ~ 15/45 ~ May not fit, ratio one step down from stock
~ 15/45-114 ~ 3.00 ~ +.170 ~ 5/15 ~ Poor wear
~ 15/44-112 ~ 2.93 ~ -.290 ~ 15/11 ~ Poor rear wear
~ 15/44-114 ~ 2.93 ~ +.340 ~ 5/22 ~ Good choice, stock wear
~ 15/43-112 ~ 2.86 ~ -.120 ~ 15/43 ~ Excellent choice
~ 15/41-112 ~ 2.73 ~ +.210 ~ 15/41 ~ Ratio a little low
~ 14/41-110 ~ 2.93 ~ -.270 ~ 7/41 ~ Good choice, Better wear than 15/44-114
~ 13/39-110 ~ 3.00 ~ +.210 ~ 13/39 ~ Front sprocket small, one step down from stock
For a 2.93 (15/44) ratio I'd use 14/114-110 instead just move the chain up one link on the front when you clean it. For a 2.86 ratio 15/43-112 is the way to go for highway riding. Other ratios are possible but this seems to be what most people find to be the right ratio for this bike.
This stuff is why I love chain drive bikes. I don't know how much this all affects real world chain life but being an engineer I love things like this, call it obsessive compulsive.
See what you've (I've) done to me? Now I've spent my afternoon looking up sprocket numbers for a bike I don't even own yet.
Take it as you will,