A coworker of mine let me try these out and theyre fantastic. Stay tight and keep the bike from wobbling. I have a Salsa 29?er and I found it fit better if I removed the tire holder and one of the spacers from the side and separarated the holder into 2 pieces and pit the spacer between the two halves. For those of you criticizing the seller for not including a guide to the beads. I?ll just tell my ocd to ignore the front extremely crooked beam. Which brings us back to the whole staying in my ears and being comfortable so I can concentrate on exercising instead of having to mess with my headphones. Does it have ANC (Active Noise Cancelling)?3. I wanted something that I could use during the winter in the garage to improve my fitness. This kit, mostly due to software and app for smart phone, is almost unusable. Once I can get them broken in more, I think they will work fine.