I have no complaints on the Kenda Kutters.
Had my quad over 80 a couple times with a 13t and my Kenda Kutters. If you've lost top speed I'd be looking elsewhere.The Kenda Kutters that I got from RMC and mounted on my stock wheels are awesome. They take a little top end speed off (5-10 km/h or 2-5 mph) but they are stable and excel on any terrain. I had them on wet, muddy trails and dirt roads yesterday and they were great.