I've used Bones Reds, Swiss and Swiss Ceramics. These are my favorite hands down. When raw speed is compared, they feel almost the same as Bones Swiss and noticeably slower than Swiss Ceramics. But it's the ease of use and peace of mind that set it apart. No spacers, no speed rings and no vibration or chatter that I get from every other bearing. You can tighten these all the way down virtually eliminating all play in the wheels. The last thing you need to worry about when hill bombing is a misaligned bearing.

Will these fit Seismic 3DM Speedvent Wheels in 73mm 79a? --- Dan Loveland Writes - Yes, Seismic uses 10mm width spacers so the Bilt-In bearings will work.

THESE BEARINGS ARE AMAZING, SO MUCH EASIER NOT TO HAVE TO MESS WITH SPEED RINGS AND BEARING SPACERS, THE FIT SEEMS TO BE VERY PRECISE, THEY ARE VERY FAST AND SMOOTH, I'LL NEVER BUY ANYTHING ELSE.

Will these work on Kahalani 184 trucks? --- Dan Loveland Writes - Yes, Kaha trucks have 8mm axles.

These bearings are the best thing on the market hands down. Easy to install cause there's no other parts, smoothest ride ever, they dont make annoying noise, they just sound like a rolling thunderstorm, or an airplane, when you go fast. it's awesome. plus you can titghten the wheels more than with other bearings so there is no wobbly wheels. and the seal is amazing, ive opened them a few times expecting to have to clean em, they were spotless! get them, they cost the same as any shitty-ass bearings, but they're awesome! if you don't love em give them to me.