I bought the stroller wheels (a MUST for just walking around) and this large stroller is so maneuverable it turns on a dime. I can easily push it with both my kids in it with one hand. I also bought the infant sling for my newborn and he is so cozy in there, and I feel he is really secure. Conversions are easy and having the ability and room to bring along the accessory pieces is a great feature. I biked to a local 5k race with kids in the trailer, then swapped out the tow arm for the jogging wheel, ran the race (died) and rode back home (died again!)

Make sure you REALLY tighten the quick release axel. My rear wheel came out of the drop outs from the trailer pushing back on the bike over a few bumps and hills and I wiped out (bike tipped over). However... I had attached the tow arm properly so the safety strap kept the trailer from rolling away, and although I was on the ground the trailer was totally upright - all as it should be. My 2.5 year old thought it was hilarious.

This sling is the best thing. It made my cougar 2 the only stroller I need for my 2 kids, right from the time my 2nd was just a newborn. Lots of room for the toddler and the infant is so cozy and secure. Chariot is the only bike trailer company to offer this feature which is the main reason I chose Chariot for my double stroller / bike trailer / jogger.

Contrary to the other review, the wheels I recieved are exactly what is shown on the website here and exactly what I expected. I have a 2006 Cougar 2 and these are a must have. I love them. Easy to attach and can be carried along when the bike trailer (or other kit) is being used. Very handy when you bike somewhere then need/want to walk. They make the stroller so maneuverable - with both kids in, I can push it with one hand and the stroller turns on a dime.