There seems to be as much difference between brands as between sizes. If you are a little short on power pick a short one. But if your gearing is a little slow for your class pick a tall one. Just go measure some. I need speed so I like 14.9"s.
 
I have both and have used both, if power is not an issue the 14.9 are taller and have 200 in flat plate vs 187 on the 15.5s. Plus they have deeper side walls and tend to lay better on a good rim, at least for my experience.

Mike
 

Eric, Will we see you Saturday? Speed limit is 20MPH. Even you should be able to live with that!! LOL. Hope to see you there.

Colin
 
I have to agree, for example it seems the Armstrong 15.5 has a bigger profile than a 15.5 Firestone 151.
 

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