I know I gained top end speed because of the larger tire diameter resulting in a taller overall final gearing. The point I was trying to make is that a very heavy or agressive tire and wheel can limit the ability of the bike to increase or even maintain its top speed without adding performance or gearing mods. I didn't notice any significant power loss with the light weight tires and wheels I installed. I'm pretty sure I would have noticed a difference if I had gone with Outlaws and steel wheels for example.You gained top speed because you increased the perimeter size of your tire but the tires still spin at the same speed as before. Therefore you are covering more real estate per rotation.
the bigger the tire you put on the slower it will turn compared to your engine rpm, but will be going faster because the tire will be covering more ground due to a larger tire circumfrence.Your right, a heavier tire could definitely keep you from getting to top speed as fast as before but I would think that you would still eventually hit your rev limiter and at that point your engine and wheels would be reving/spining as fast no matter what tire is on it. You could have a hard time maintaining top speed depending on the amount of drag/weight the tires put on the machine though. I still have stocks so I guess I really can't say. Sounds good in theory.