yeah i was running 28 mudlites, and the stock clutching is the best for speed as far as i found out, but i have to ask if your running 28s why you are worried about top speed, i can tell you from personal experience the 28's are hard on stock tie rods, and in high gear on takeoff with stock primary spring gets hard on the belt, easier to glaze a spot. anyhow if you ever want to clutch it for low end grunt go lime green secondary, but it tops out around 55
Almond would be a good choice for just trail riding. If you plan on riding deep mud you might consider a green secondary, but, you'll loose topend. The lites are well ....lite and don't need as heavy a secondary as most 28's so a almond may be all you need. I know with my 27" lites the almond is plenty.
One thing I would like to mention is that when you put bigger tires on you are throwing off the speedometer so for example if you are running 29.5s and your speedometer says 55 them you are really going 62-65 mph. So you run a lime green spring with 29.5s and you top out at 55 you still have a top end of 62-65 so you are not losing that much. Me personally I will agree with some others on here if you are running bigger than 28s on your bike and you are running 55-60mph you are asking for an accident because big tires will wreak havoc on front end parts. Just my .02
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