CushCoreXC Set - Includes (2) Tire Inserts, (2) Presta Valves & Rim Stickers, Easy At-Home Installation, Bicycle Tire Inserts, Helps Improve Ride Quality, Fits a 1.8"-2.4" Tire (2-Pack)

I was surprised, but I was able to get this into a 27.5x1.8 (45-584) tire on a 650B 584x25 rim. It looks too wide to work.Installing is not much harder than getting a tire on can be. Have faith. The trick, as usual, is to get the tire beads into the center channel of the rim. First one side of tire all into the center channel of rim, and then 85% of the other side. The insert will be above the tire beads.With a little soapy solution at the last 15%, the rest isn’t too hard with a lever or two.Relatively high pressure inflate will push everything into place, namely tire beads into rim channels. The insert will seat itself on the rim. Done.Will report on performance in another review.

One of the best upgrades you can make to your bike if you ride aggressively and/or on rocky trails.

I know nothing about the product but my husband loves it. So if his happy I’m happy