They snap into with barely any kind of pressure. Our bike tires are 27 1/2 and 29. Now having a proper gaming sesh- Red Dead. Sole on the first pair wore out after a matter of months (heavy use - walking the dog and at work). I tried wearing them without socks and theyre not as comfortable as I expected them to be. What I ended up doing was keeping my old battery, recharging it, and using it solely for the lightbar circuit. She usually wears a 9. The Keen Terradorra Waterproof shoes are warm and my feet felt sweaty with synthetic socks. The recipes are mouthwatering and makes you want to go to wine country. The only reason I could not give 5 stars is that after a year, the pressure from my little toe has worn the side of the slipper to point where I had to Patch it from the inside with duct tape.